Editing Keirin

{{Use dmy dates|date=December 2021}}
{{short description|Form of motor-paced cycle racing}}
{{Distinguish|Kirin (disambiguation){{!}}Kirin}}
{{infobox sport
| name = {{nihongo|'''Keirin'''|ケイリン}}
| image = ColwoodKeirin.jpg
| imagesize = 250px
| caption = Keirin in [[Colwood, British Columbia]], July 2006
| union = [[Union Cycliste Internationale]] (UCI) and [[JKA Foundation]] (Japanese regulating body)
| nickname = 
| first = 1948 in [[Kitakyushu, Fukuoka]], Japan
| firstlabel = Year originated
| registered = 
| clubs =
| contact = 
| team = 
| mgender = 
| category = [[Track cycling]]
| ball = 
| olympic = [[Cycling at the 2000 Summer Olympics#Track cycling|2000]], [[Cycling at the 2004 Summer Olympics#Track cycling|2004]], [[Cycling at the 2008 Summer Olympics#Track cycling|2008]], [[Cycling at the 2012 Summer Olympics#Track cycling|2012]], [[Cycling at the 2016 Summer Olympics#Track cycling|2016]], [[Cycling at the 2020 Summer Olympics#Track cycling|2020]], [[Cycling at the 2024 Summer Olympics#Track cycling|2024]]
}}
[[File:KEIRIN logo.svg|thumb|right|300px|KEIRIN Logomark]]
{{nihongo|'''Keirin'''|[[:ja:競輪|競輪]] / [[:ja:ケイリン|ケイリン]]||{{IPA|ja|keːɾiɴ|}}}}<ref>In Japan, kanji 競輪 generally means the original Japanese Keirin, while katakana ケイリン is often used for the modified international version of the sport.</ref> – "racing track" – is a form of [[Motor-paced racing|motor-paced cycle racing]] in which [[track cycling|track cyclists]] sprint for victory following a speed-controlled start behind a motorized or non-motorized pacer. It was developed in [[Japan]] around 1948 for [[Gambling in Japan|gambling]] purposes and became an official [[Cycling at the Summer Olympics|event]] at the [[Cycling at the 2000 Summer Olympics#Track cycling|2000 Olympics]] in Sydney, Australia.

[[File:Keirin race - hiratsuka velodrome - kanagawa - 2023 11 07.webm|thumb|Keirin race in [[Kanagawa Prefecture|Kanagawa]], 2023]]
Riders use [[Fixed-gear bicycle#Brakeless|brakeless fixed-gear bicycles]].
Races are typically {{convert|1.5|km|mi}} long: 6 laps on a {{convert|250|m|yd|abbr=on}} track, 4 laps on a {{convert|333|m|yd|abbr=on}} track, or 4 laps on a {{convert|400|m|yd|abbr=on}} track. Lots are drawn to determine starting positions for the [[Cycling sprinter|sprint riders]] behind the pacer, which is usually a [[motorcycle]], but can be a [[derny]], [[electric bicycle]] or [[tandem bicycle]]. Riders must remain behind the pacer for 3 laps on a {{convert|250|m|yd|abbr=on}} track. The pacer starts at {{convert|30|kph|abbr=on}}, gradually increasing to {{convert|50|kph|abbr=on}} by its final circuit. The pacer leaves the track {{convert|750|m|yd|abbr=on}} before the end of the race (3 laps on a {{convert|250|m|yd|abbr=on}} track). The winner's finishing speed can exceed {{convert|70|kph|abbr=on}}.

Competition keirin races are conducted over several rounds with one final. Some eliminated cyclists can try again in the [[repechage]]s.

==World championships==
{{see also|UCI Track Cycling World Championships – Men's keirin}}
{{see also|UCI Track Cycling World Championships – Women's keirin}}

Keirin, in its modified form{{what?|date=January 2025}}, has been a [[Union Cycliste Internationale|UCI]] [[UCI Track Cycling World Championships – Men's keirin|men's World Championship event]] since 1980 and a [[UCI Track Cycling World Championships - Women's Keirin|UCI women's World Championship event]] since 2002. [[Danny Clark (cyclist)|Danny Clark]] of [[Australia]] and [[Li Na (cyclist)|Li Na]] of [[China]] were the first UCI world champions. The 2019 men's and women's world champions are [[Matthijs Büchli]] of [[Netherlands]] and [[Lee Wai Sze]] of [[Hong Kong]].

==Olympics==
Keirin made its debut at the [[2000 Summer Olympics]] in [[Sydney]]<ref>{{cite web|url=http://www.olympic.org/cycling-track-equipment-and-history?tab=History | title=Cycling Track Equipment and History | access-date=7 August 2012}}</ref> as a men's event, after being admitted into the Olympics in December 1996.<ref name="bbc">{{cite news |url= http://news.bbc.co.uk/2/hi/asia-pacific/7525072.stm |title=Cycling cash linked to Olympics |date=27 July 2008 |work=BBC News}}</ref> The women's event was added for the [[2012 Summer Olympics]] in [[London]].

A [[BBC News]] investigation, reported in July 2008, found evidence that following admission into the Olympics, the [[Union Cycliste Internationale]] required (in writing) the [[JKA Foundation|Japan Keirin Association]] to support UCI projects in "material terms"; over a period of time the association subsequently gave US$3&nbsp;million to UCI in consideration of "the excellent relationship the UCI has with representatives of the Olympic movement". The UCI and its then-president, [[Hein Verbruggen]], denied any wrongdoing.<ref name="bbc" />

At the Tokyo 2020 Olympics, the [[Cycling at the 2020 Summer Olympics – Men's keirin|Men's keirin]] took place on 7 and 8 August 2021, with 30 cyclists from 18 nations competing, and the gold medal going to [[Jason Kenny]] from Great Britain.  The [[Cycling at the 2020 Summer Olympics – Women's keirin|Women's keirin]] took place on 4 and 5 August 2021, with 29 cyclists from 18 nations competing, and the gold medal going to [[Shanne Braspennincx]] from The Netherlands.

; Men
{| class="wikitable" style="margin-top:0; margin-left:1em"
!Olympics !! Men's Champion
|-
|[[Cycling at the 2000 Summer Olympics#Track cycling|2000]] || {{flagIOCathlete|[[Florian Rousseau]]|FRA|2000 Summer}}
|-
|[[Cycling at the 2004 Summer Olympics – Men's keirin|2004]] || {{flagIOCathlete|[[Ryan Bayley]]|AUS|2004 Summer}}
|-l
|[[Cycling at the 2008 Summer Olympics – Men's keirin|2008]] || {{flagIOCathlete|[[Chris Hoy]]|GBR|2008 Summer}}
|-
|[[Cycling at the 2012 Summer Olympics – Men's keirin|2012]] || {{flagIOCathlete|[[Chris Hoy]]|GBR|2012 Summer}}
|-
|[[Cycling at the 2016 Summer Olympics – Men's keirin|2016]]
|{{flagIOCathlete|[[Jason Kenny]]|GBR|2016 Summer}}
|-
|[[Cycling at the 2020 Summer Olympics – Men's keirin|2020]]
|{{flagIOCathlete|[[Jason Kenny]]|GBR|2020 Summer}}
|-
|[[Cycling at the 2024 Summer Olympics – Men's keirin|2024]]
|{{flagIOCathlete|[[Harrie Lavreysen]]|NED|2024 Summer}}
|}

;Women
{| class="wikitable" style="margin-left:1em"
!Olympics !! Women's Champion
|-
|[[Cycling at the 2012 Summer Olympics – Women's keirin|2012]] ||{{flagIOCathlete|[[Victoria Pendleton]]|GBR|2012 Summer}}
|-
|[[Cycling at the 2016 Summer Olympics – Women's keirin|2016]] ||{{flagIOCathlete|[[Elis Ligtlee]]|NED|2016 Summer}}
|-
|[[Cycling at the 2020 Summer Olympics – Women's keirin|2020]] ||{{flagIOCathlete|[[Shanne Braspennincx]]|NED|2020 Summer}}
|-
|[[Cycling at the 2024 Summer Olympics – Women's keirin|2024]] ||{{flagIOCathlete|[[Ellesse Andrews]]|NZL|2024 Summer}}
|-
|}

==Keirin in Japan ==
{{see also|Gambling in Japan}}
[[Image:Tairakeirin 2008-3.jpg|thumb|right|200px|The entrance and grandstand at the [[Iwaki-Taira Velodrome]] in [[Iwaki, Fukushima|Iwaki]], [[Fukushima Prefecture|Fukushima]]]]
[[Image:TachikawaKeirin.jpg|thumb|right|200px|Start of a race at [[Tachikawa, Tokyo|Tachikawa]] Velodrome in Tokyo. Riders start from the blocks and pace up to speed behind the pacer, wearing purple and orange. A referee observes the start in the tower to the right.]]
[[Image:Omiya keirin1.jpg|thumb|right|200px|During a race at [[Omiya Velodrome]] in [[Saitama Prefecture|Saitama]], the nine racers form a line behind the pacer as they go around a corner.]]
[[Image:Omiya keirin finish 3.jpg|thumb|right|200px|Racers sprinting to the finish line in the last lap of a race at the Ōmiya Velodrome]]
Track cycling began as one of four allowed [[sports betting|betting sport]]s in Japan in 1948,<ref>{{cite news |last= Falkingham |first=Katie |date=15 April 2020 |url= https://www.bbc.com/sport/cycling/52283598 |title= Keirin School: Inside the strict and secret world of bicycle racing |work=BBC Sport}}</ref> and has since become very popular there. In 1957, the [[Nihon Jitensha Shinkōkai]] (NJS;  Japan Bicycle Association) was founded to establish a uniform system of standards for the sport in Japan. Today keirin racing is regulated by the [[JKA Foundation]]. In 2011, the sum of bets placed on keirin races exceeded [[Japanese yen|¥]]600&nbsp;billion  (approximately [[US$]]5&nbsp;billion), and the number of attendees in the races was approximately 4.9&nbsp;million people.<ref>{{Cite web|url = http://www.meti.go.jp/policy/mono_info_service/mono/keirin_autorace/pdf/keirin_jokyo201212.pdf|script-title=ja:競輪を巡る最近の状況について|publisher = Japanese Ministry of Economy, Trade and Industry|language=ja}}</ref>

Aspiring professional keirin riders in Japan compete for entrance into the Japan Keirin School. The 10 percent of applicants who are accepted then undergo a strict 15-hours-per-day training regimen.<ref>{{cite news |title=Keirin School: Inside the strict and secret world of bicycle racing in Japan |work=BBC Sport |url=https://www.bbc.co.uk/sport/cycling/52283598 }}</ref> Those who pass final examination must still be approved by the Japan Keirin Association<ref name="History of Keirin Racing">{{Cite web|title = History of Keirin Racing|publisher = Keirin Cycle Culture|url = http://www.keirinberlin.de/?page_id=41|access-date = 4 August 2012|url-status = dead|archive-url = https://web.archive.org/web/20130507100703/http://www.keirinberlin.de/?page_id=41|archive-date = 7 May 2013}}</ref> before being allowed to compete.

Japanese races for women were reintroduced in July 2012, under the title of "Girls Keirin" ([[:ja:ガールズケイリン|ガールズケイリン]]). Women were previously permitted to participate from 1949 until 1964. Like the men, the women must also undergo a strict training regimen at the Keirin School.

===Champions from Japan===
{{nihongo|[[Koichi Nakano]]|中野 浩一|Nakano Kōichi}} was one of the first Japanese keirin athletes to compete outside of his native country, Nakano holds the best matched sprint record as a track cyclist at the [[UCI Track World Championships]] with a record of ten consecutive professional [[Sprint (cycling)|Sprint]] [[UCI Track Cycling World Championships – Men's sprint|World Track Cycling Championship]] wins from 1977 to 1986 against mostly western European pro track cyclists, although he never won the Keirin World Championship. At that time, many leading sprint riders were from the Eastern bloc countries and competed in separate "amateur" events.

[[Katsuaki Matsumoto]] (1928-2021) is the all-time professional keirin athlete with the most wins - 1341 - over his career (he retired in 1981 at the age of 53).

===Typical race===
Keirin races in Japan begin with the cyclists parading to the starting blocks, bowing as they enter the track and again as they position their bikes for the start of the race. Every participant is assigned a number and a colour for identification and betting purposes.

At the sound of the gun, the cyclists leave their starting blocks and settle into a position behind the pacer, who is another keirin bicyclist wearing purple with orange stripes. Cyclists initially settle into different groups, referred to as "lines", where they try to work together with others to maximize their chance of winning.<ref>{{cite web |url=http://keirin.jp/pc/static/beginner/en/basics/line/index.html |title=Review the Lines|author=<!--Not stated--> |website=keirin.jp|access-date=10 August 2019}}</ref>

As the pace quickens, the pacer will usually depart the track with between one and two laps remaining, though the actual location where the pacer leaves varies with every race. With {{frac|1|1|2}} laps remaining, officials begin sounding a [[bell (instrument)|bell]] or [[gong]], increasing in frequency until the bicyclists come around to begin the final lap.

Keirin ovals are divided into specific areas: The two straightaways (homestretch and backstretch), the four turns (corners), and two locations called the "centre", referring to the area between corners 1 and 2 (1 centre) and corners 3 and 4 (2 centre).

The race is monitored by referees. Two of the referees are stationed in towers along the backstretch (2nd and 3rd corners), while others review the homestretch area from a control room using [[closed-circuit television|closed-circuit cameras]].<ref name=keirin100717>{{cite web |url=http://keirin.jp/sp/topicsdetail?nnum=448&skbn=1&scyy=2017&scmm=07&cgcd=&nxtp=1|title=走路審判員の執務体制の変更について|author=<!--Not stated--> |date=10 July 2017|website=keirin.jp |access-date=10 August 2019|language=ja}}</ref> Once the race has finished, a referee can signal a possible rule violation by illuminating a red light at the corner nearest to where the infraction may have occurred, or by waving a red flag.<ref name=keirin100717/> Judges then examine the video of the race and decide if a competitor committed a rules violation and should be disqualified. Once the order of finish is finalised, the race is declared official and the winning bets are paid.

===Ranks===
There are a total of six ranks that competitors can obtain in Japanese keirin racing. SS is the highest rank, followed by S1, S2, A1, A2 and A3. All new keirin graduates begin their careers with an A3 rank and work their way up by competing in keirin events.

The color of the shorts worn by each keirin competitor indicates rank. Those in A-class (A1, A2, A3) wear black shorts with a green stripe and white stars. S-class competitors (S1 and S2) wear a red stripe instead of a green stripe. Those in the elite SS class wear red shorts with a black stripe, white stars and special insignia. Introduced in 2007, the SS ranking is assigned by the NJS every December to the top nine Keirin athletes.<ref>{{cite web|url=http://bg.keirin.jp/en/abcs/cyclists/index.html|title=Cyclists|publisher=Keirin.jp|access-date=28 January 2013|language=ja|archive-url=https://web.archive.org/web/20130420025049/http://bg.keirin.jp/en/abcs/cyclists/index.html|archive-date=20 April 2013|url-status=dead}}</ref> These nine compete in that year's Keirin Grand Prix and retain their rank until the following December.

===Distances===
The distance of each race depends on gender and rank. For men, distances for those ranked A3 are at 1,600 meters, while all others compete at 2,000 meters. The finals of some of the top graded events are run at a longer distance of 2,400 meters. The season-ending Keirin Grand Prix is held at 2,800 meters.

All events for women are currently run at 1,600 meters. There are usually small variances in distance based on the size of the track.

===Race grades===
A race meeting at any given keirin [[velodrome]] in Japan is assigned a grade. The highest graded events are GP, GI (G1), GII (G2) and GIII (G3), reserved only for S-class riders. Underneath those are FI (F1) events, which are open to both S-class and A-class riders. The lowest graded events, FII (F2), are reserved for A-class riders.

The GP grade designation is reserved for the Keirin Grand Prix, a three-day meet held at the end of December for the year's top keirin competitors. The meet ultimately concludes with the Grand Prix race itself, which determines the annual Keirin racing champion.

As of 2018, a selection committee determines the competitors for the Grand Prix race using the following priority:<ref>{{cite web|url=https://ctc.gr.jp/pc/news/201811261637.php|title=『KEIRINグランプリ2018【GP】』出場予定選手の決定について|website=ctc.gr.jp|language=ja|access-date=10 August 2019|date=26 November 2018|archive-date=11 August 2019|archive-url=https://web.archive.org/web/20190811015852/https://ctc.gr.jp/pc/news/201811261637.php|url-status=dead}}</ref>

* Winners of each of the six GI events during the year,
* Japanese medal winners of individual [[Cycling at the Summer Olympics|cycling events]] during the [[Summer Olympic Games]], or in non-Olympic years, the [[UCI Track Cycling World Championships]],
* Competitors specifically recognized by the selection committee, and
* Competitors that have earned the most prize money from Keirin events during the year.

Also part of the Grand Prix meet is the '''Young Grand Prix''', which is open to the best of those that have begun competing in Keirin within the last three years; it is the only Keirin race of the year in which both S-class and A-class compete in the same race. A new addition to the meet in 2012 was the '''Girls' Grand Prix''' for the sport's top female competitors.

Another prestigious event on the annual keirin racing calendar is the GI Japan Championship. Held every May over a period of six days, it is the longest single race meeting of the year.

Each of the keirin velodromes are generally permitted to host one event per year of either GI, GII or GIII designation. The remaining events at each track consist of a combination of FI and FII races for a total of approximately 70 race days per year. On average there is one GI or GII event every month and one GIII meeting per week on the annual calendar.

===Top Keirin events===
As of 2024, the top events on the Keirin racing calendar are as follows:<br>
※=''Girls Keirin''
{| class="wikitable"
! Month
! Grade
! Event
|-
|February
|GI
|{{Ill|Yomiuri News Cup All-Japan Selection|ja|読売新聞社杯全日本選抜競輪}}<br>{{nihongo2|(読売新聞社杯全日本選抜競輪)}}
|-
|March
|GII
|{{Ill|Winners Cup (keirin)|lt=Winners Cup|ja|ウィナーズカップ}}<br>{{nihongo2|(ウィナーズカップ)}}
|-
|April
|GI
|{{Ill|All-Girls' Classic|ja|オールガールズクラシック}}※<br>(オールガールズクラシック)
|-
|May
|GI
|{{Ill|Japan Championship Keirin|ja|日本選手権競輪}}<br>{{nihongo2|(日本選手権競輪)}}
|-
|rowspan="2" |June
|GI
|{{Ill|Prince Takamatsu Memorial Cup|ja|高松宮記念杯競輪}}<br>{{nihongo2|(高松宮記念杯競輪)}}
|-
|GI
|{{Ill|Pearl Cup|ja|パールカップ}}※<br>(パールカップ)
|-
|July
|GII
|{{Ill|Summer Night Festival|ja|サマーナイトフェスティバル}}<br>{{nihongo2|(サマーナイトフェスティバル)}}
|-
|rowspan="2" |August
|GI
|{{Ill|All-Star Keirin|ja|オールスター競輪}}<br>{{nihongo2|(オールスター競輪)}}
|-
|GI（only2024:FII）
|{{Ill|Women's All-Star Keirin|ja|女子オールスター競輪}}※<br>{{nihongo2|(女子オールスター競輪)}}
|-
|September
|GII
|{{Ill|Kyodo News Cup|ja|共同通信社杯競輪}}<br>{{nihongo2|(共同通信社杯競輪)}}
|-
|October
|GI
|{{Ill|Prince Tomohito Cup/World Championship Tournament|ja|寬仁親王牌・世界選手権記念トーナメント}}<br>{{nihongo2|(寛仁親王牌・世界選手権記念トーナメント)}}
|-
|November
|GI
|{{Ill|Asahi News Cup Keirin Festival|ja|朝日新聞社杯競輪祭}}<br>{{nihongo2|(朝日新聞社杯競輪祭)}}
|-
|November
|GI
|{{Ill|Keirin Festival Women's Championship|ja|競輪祭女子王座戦}}※<br>(競輪祭女子王座戦)
|-
|rowspan="3" |December
|GP
|{{Ill|Keirin Grand Prix|ja|KEIRINグランプリ}}<br>{{nihongo2|(KEIRINグランプリ)}}
|-
|GII
|{{Ill|Young Grand Prix|ja|ヤンググランプリ}}<br>{{nihongo2|(ヤンググランプリ)}}
|-
|GP
|{{Ill|Girl's Grand Prix|lt=Odds Park Cup Girl's Grand Prix|ja|オッズパーク杯ガールズグランプリ}}※<br>{{nihongo2|(オッズパーク杯ガールズグランプリ)}}
|}

===Race schedule===
Keirin velodromes follow the same basic schedule of races when conducting a race meeting. On the first day of competition, the better keirin competitors are assigned to races of higher caliber, while others are assigned to low-caliber races. Keirin racers are guaranteed to compete on each day of the meeting unless they are disqualified from a race or retire from the meet for any reason - in which case alternate competitors are called up to fill in the lower-caliber races.

Below is a schedule of races conducted during a typical three-day FI event (open to both S-class and A-class riders).<ref>{{cite web |url=http://keirin.jp/pc/dfw/portal/guest/news/2012khn/04/news20120420_01.html|title=平成24年7月（平成24年6月30日節初日）からFI開催のレース数が変更となります|publisher=keirin.jp|access-date=28 January 2013|language=ja}}</ref>

====Day 1====
*Races 1–5: {{nihongo|A-class Preliminary|A級 予選|A-kyū yosen}} (low caliber)
**First four or five finishers in each race advance to Day 2 Semifinals
*Race 6: {{nihongo|A-class Special|A級 特選|A-kyū tokusen}} (high caliber)
**All riders compete in Day 2 Semifinals

After six races, S-class riders compete:
*Races 7–10: {{nihongo|S-class Preliminary|S級 予選|S-kyū yosen}}
**First three or four finishers in each race advance to Day 2 Semifinals
*Race 11: {{nihongo|S-class Special|S級 特選|S-kyū tokusen}}
**All riders compete in Day 2 Semifinals

====Day 2====
*Races 1–2: {{nihongo|A-class General|A級 一般|A-kyū ippan}}
**First two finishers in each race advance to Day 3 Special
*Race 3: {{nihongo|A-class Selection|A級 選抜|A-kyū senbatsu}}
**First five finishers advance to Day 3 Special
*Races 4–6: {{nihongo|A-class Semifinals|A級 準決勝|A-kyū junkesshō}}
**First three finishers in each race advance to Day 3 Final

S-class riders then compete to advance:
*Races 7–8: {{nihongo|S-class General|S級 一般|S-kyū ippan}}
**First one or two finishers in each race advance to Day 3 Special
*Races 9–11: {{nihongo|S-class Semifinals|S級 準決勝|S-kyū junkesshō}}
**First three finishers in each race advance to Day 3 Final

====Day 3====
*Races 1–2: {{nihongo|A-class General|A級 一般|A-kyū ippan}}
*Races 3–5: {{nihongo|A-class Special|A級 特選|A-kyū tokusen}}
*Races 6–7: {{nihongo|S-class General|S級 一般|S-kyū ippan}}
*Race 8: {{nihongo|S-class Special|S級 特選|S-kyū tokusen}}
*Race 9: {{nihongo|A-class Final|A級 決勝|A-kyū kesshō}}
*Race 10: {{nihongo|S-class Special|S級 特選|S-kyū tokusen}}
*Race 11: {{nihongo|S-class Final|S級 決勝|S-kyū kesshō}}

===Betting===
Bets that can be made on Keirin races include, but are not limited to:
* {{nihongo|'''Exacta'''|2車単|nishatan}} – selecting the first two finishers in exact order
* {{nihongo|'''Quinella'''|2車複|nishafuku}} – first two finishers in any order
* {{nihongo|'''Trifecta'''|3連単|sanrentan}} – first three finishers in exact order
* {{nihongo|'''Trio'''|3連複|sanrenpuku}} – first three finishers in any order
* {{nihongo|'''Quinella Place''', or '''wide'''|ワイド|waido}} - selecting two to finish in the top three, in any order.
Some wagers cannot be placed if there is a small number of competitors in the race.

During major race meets, some jackpot wagers are offered:
* '''Dokanto! 4 two'''<ref>{{cite web|url=http://keirin.jp/pc/dfw/dokanto/pc/about/dokanto4/|title=Dokanto! 4 two（ドカント フォートゥー）とは?|website=keirin.jp|access-date=28 January 2013|language=ja|url-status=dead|archive-url=https://web.archive.org/web/20130603063335/http://keirin.jp/pc/dfw/dokanto/pc/about/dokanto4/|archive-date=3 June 2013}}</ref> – selecting the exacta in four consecutive (typically the last four) races.
* '''[[Pick 6 (horse racing) |Dokanto! 7]]'''<ref>{{cite web|url=http://keirin.jp/pc/dfw/dokanto/pc/about/dokanto7/|title=Dokanto! 7 （ドカント セブン）とは?|website=keirin.jp|access-date=28 January 2013|language=ja|url-status=dead|archive-url=https://web.archive.org/web/20130211142322/http://keirin.jp/pc/dfw/dokanto/pc/about/dokanto7/|archive-date=11 February 2013}}</ref> – this is what would be called a Pick 7 in horse racing in that the bettor selects the winner of each of the last seven races of the day.

The money bet into the Dokanto wagers can carry over if there are no winning tickets, even to subsequent race meets at another velodrome in the country.

{{see also|Parimutuel betting}}

In extraordinary circumstances, races have been declared no-contests, forcing velodromes to refund millions of yen in bets. Such results are generally known as a {{nihongo|''failure''|不成立|fuseiritsu}}. A race at Shizuoka velodrome on 2 January 2008 was declared a failure when the back wheel of the pacer's bicycle nicked the bicycle of an actual competitor, causing him to fall.<ref>{{cite web|url=http://keirin.jp/pc/dfw/dataplaza/guest/raceresult?KCD=38&KBI=20080102&RNO=9|title=Race Results: Shizuoka - Race 9 - January 2, 2008|website=keirin.jp|language=ja|access-date=29 December 2008|url-status=dead|archive-url=https://archive.today/20120709104013/http://keirin.jp/pc/dfw/dataplaza/guest/raceresult?KCD=38&KBI=20080102&RNO=9|archive-date=9 July 2012}}</ref> In a race at [[Iwaki-Taira Velodrome]] on 14 December 2008, separate infractions resulted in the disqualification of the entire field; all but one of the competitors were handed a one-year suspension by the velodrome after the race.<ref>{{cite web|url=http://keirin.jp/pc/dfw/dataplaza/guest/raceresult?KCD=13&KBI=20081214&RNO=10|title=Race Results: Iwaki-Taira - Race 10 - December 14, 2008|website=keirin.jp|language=ja|access-date=29 December 2008|url-status=dead|archive-url=https://archive.today/20120714083117/http://keirin.jp/pc/dfw/dataplaza/guest/raceresult?KCD=13&KBI=20081214&RNO=10|archive-date=14 July 2012}}</ref><ref>{{cite web|url=http://www.zakzak.co.jp/top/200812/t2008121505_all.html|script-title=ja:いわき平競輪で9人全員失格... 前代未聞の珍事ナゼ？|website=zakzak.co.jp|language=ja|access-date=29 December 2008|url-status=dead|archive-url=https://web.archive.org/web/20090201030101/http://www.zakzak.co.jp/top/200812/t2008121505_all.html|archive-date=1 February 2009}}</ref> The suspensions were lifted four months later.

===Equipment===
[[Image:Chaintug.jpg|thumb|right|300 px|Mikashima chaintug with NJS stamp]]
As a result of the [[parimutuel betting|parimutuel gambling]] that surrounds keirin racing in Japan, The Nihon Jitensha Shinkōkai (Japanese Bicycle Association or NJS)— now under the [[JKA Foundation]]— developed a strict system of standards for bicycles and tools to ensure that no rider will have any advantage based on equipment. All components must be made using NJS-approved materials and techniques, and the frames themselves must be handmade by an NJS-certified builder. For example, the bicycles [[Bicycle frame|frames]] used in Japanese Keirin races must be made from [[41xx steel|chromoly steel]] using traditional techniques like [[brazing]], and wheels must have exactly 36 spokes per wheel. 

Popular frame manufacturers include [[Yoshiaki Nagasawa|Nagasawa]], [[3Rensho]], Makino, Kalavinka, Level, [[Bridgestone#Bicycles|Bridgestone]], [[Panasonic#National.2FPanasonic bicycles|Panasonic]], and Samson. Other components come from Japanese manufacturers like [[Shimano]], Nitto, Hatta, MKS, [[Kashimax]], and [[Sugino]].{{Citation needed|date=August 2008}} Because the primary goal of the NJS is to support the Japanese manufacturing industry, its bureaucracy is typically resistant to the certification of foreign manufacturers' components. The few exceptions to this are Italian cycling equipment manufacturers [[Campagnolo]] and [[Cinelli]], which received NJS certification for some components.<ref name="Fritz"/>

Exceptions to these rules include Girls' Keirin and Keirin Evolution. Girls' Keirin allows for a limited set of non-NJS tires, stems, saddles, and [[Carbon-fiber-reinforced polymer|carbon-fiber]] frames and wheels.<ref name="gkequipment" /> Manufacturers of the frames used in Girls' Keirin are Boma, Bridgestone, Gan Well, Kalavinka, Bomber, and MBK.<ref name="gkequipment">{{cite web|url=http://www.girlskeirin.com/portal/about/use.html|title=Girls' Keirin Equipment|url-status=dead|archive-url=https://web.archive.org/web/20151005115024/http://www.girlskeirin.com/portal/about/use.html|archive-date=5 October 2015}}</ref> Keirin Evolution participants may use any frames or components approved by the [[JKA Foundation|NJS]], [[Union Cycliste Internationale|UCI]], or [[Japan Cycling Federation|JCF]].<ref name="evolutionrules">{{cite web|url=https://keirin.jp/pc/dfw/portal/guest/news/2013khn/12/news20131224_04.html|title=Keirin Evolution outline}}</ref> NJS-approved equipment is not required for keirin races sanctioned by the [[Union Cycliste Internationale|UCI]] or its local national sporting associations, including UCI-sanctioned races in Japan.

The NJS standard does not necessarily relate to quality or standard of manufacture, though NJS-approved equipment often sells for more than comparable equipment because of its niche use, strict build requirements, and finite availability.<ref name="Gordan Wilson">{{Cite book | last = Gordan Wilson | first = David | title = Bicycling Science | publisher = The MIT Press; 3 edition | date = 1 April 2004 | isbn = 978-0-262-73154-6 | url-access = registration | url = https://archive.org/details/isbn_9780262731546 }}</ref><ref name="Fritz">{{Cite web | last = Fritz | first = Yokota | title = NJS: Nihon Jitensha Sinkokai | publisher = Cyclelicio.us | date = 21 November 2006 | url = http://www.cyclelicio.us/2006/11/njs-nihon-jitensha-sinkokai.html | access-date = 30 October 2009 | archive-url = https://web.archive.org/web/20130413091040/http://www.cyclelicio.us/2006/11/njs-nihon-jitensha-sinkokai.html | archive-date = 13 April 2013 | url-status = dead }}</ref> 


==See also==
*[[Motor-paced racing]]
*[[Single-speed bicycle]]
*[[UCI Track Cycling World Championships – Men's sprint]]
*[[UCI Track Cycling World Championships – Men's keirin]]
*[[UCI Track Cycling World Championships – Women's keirin]]
*[[BMX racing]]
*[[Auto Race (Japanese sport)]]

==References==
{{reflist|25em}}

== External links ==
{{commons category|Keirin}}
* [http://keirin.jp/ Keirin's official website in Japan] {{in lang|ja}}

{{Track cycling}}
{{Racing}}

{{Authority control}}

[[Category:Keirin| ]]
[[Category:Cycle racing in Japan]]
[[Category:Events in track cycling]]
[[Category:Individual sports]]
[[Category:Sports originating in Japan]]