Editing Isle of Man TT (section)

====Senior TT====
{{main|Senior TT}}

[[File:2010 senior TT IMG 1188.JPG|thumb|200px|right|[[Ian Hutchinson (motorcyclist)|Ian Hutchinson]] on the start-line of the [[Senior TT]] Race on 11 June 2010 ]]
For the [[1911 Isle of Man TT]], the first TT event using the [[Snaefell Mountain Course]] or ''Mountain Course'', two separate races were introduced. The first event was a four lap [[Junior TT]] race and a separate [[Senior TT]] race for 500&nbsp;cc single-cylinder and 585&nbsp;cc twin-cylinder motorcycles, over five laps of the new {{convert|37.5|mi|adj=on}} Snaefell Mountain Course. The new technical challenges of the Mountain Course forced changes on entrants and motorcycle manufacturers alike. The American Indian motorcycle factory fitted a two-speed gearbox and chain-drive.<ref>{{cite news| first=Simon| last=Patterson|title=THE COMPLETE BEGINNER'S GUIDE TO THE 2023 ISLE OF MAN TT |url=https://www.the-race.com/motorcycle-racing/2023-isle-of-man-tt-guide-and-schedule/ |access-date=13 March 2024 |work=The Race |date=29 May 2023 |language=en}}</ref> This proved to be the winning combination when Oliver Godfrey won the 1911 Senior TT race riding an [[Indian (motorcycle)|Indian]] at an average speed of {{convert|47.63|mph|abbr=on}}. Fitted with a six-speed belt drive<ref>''Motocourse History of the Isle of Man TT Races 1907–1989'' page 18-19 and 23 (Mick Woollett Technical Notes) Nick Harris © Hazelton Securities Ltd (1990) Graficas Esatalla SA {{ISBN|0-905138-71-6}}</ref> [[Charlie Collier]] riding a Matchless motorcycle finished second in the 1911 Senior TT race and was later disqualified for illegal refuelling. During an early morning practice session for the 1911 Isle of Man TT races, [[Victor Surridge]] died after crashing his [[Rudge-Whitworth|Rudge]] motorcycle at [[Glen Helen, Isle of Man|Glen Helen]], the first death of a competitor on the Snaefell Mountain Course and the first death in the [[Isle of Man]] of a person in an automotive accident.<ref>''TT Topics and Tales'' by David Wright – Amulree Publications (4 April 2006) {{ISBN|1901508099}}</ref>

:* 1911 For single cylinder motorcycles not exceeding 500&nbsp;cc engine capacity and 585&nbsp;cc twin cylinder motorcycles.
:* 1912–1939 For motorcycles not exceeding 500&nbsp;cc engine capacity.
:* 1947–1948 For motorcycles not exceeding 500&nbsp;cc engine capacity and a ban on engine supercharging.
:* 1949–1976 FIM World Championship event for motorcycles not exceeding 500&nbsp;cc engine capacity.
:* 1977–1984 for motorcycles not exceeding 500&nbsp;cc engine capacity.
:* 1985–2004 for motorcycles complying with ACU TT Formula 1 rules not exceeding 1,010&nbsp;cc engine capacity.
:* 2004 onwards for motorcycles complying with ACU/FIM Superbike rules not exceeding 1,000&nbsp;cc engine capacity.

The 2015 specifications for entries into the Senior TT race are:
* TT Superbike: (Machines complying with the 2015 FIM Superbike Championship specifications)<ref>''2010 International Tourist Trophy Regulations'' page 2 ACU Events Isle of Man Limited</ref>
** Over 750&nbsp;cc up to 1000&nbsp;cc 4 cylinders 4-stroke
** Over 750&nbsp;cc up to 1000&nbsp;cc 3 cylinders 4-stroke
** Over 850&nbsp;cc up to 1200&nbsp;cc 2 cylinders 4-stroke

:*Supersport [[Junior TT]] (without limitation of tyre choice)
:** TT Superstock (without limitation of tyre choice)
:** Other machines admitted at the discretion of the Organisers.