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TT100 (motorcycle tyre)
The Dunlop K81 TT100 is a motorcycle tyre〔The Book of Ducati 750SS. Ian Falloon Veloce Publishing Ltd, 1 Nov 2010〕 thought to be an "obligatory" performance upgrade 〔Leanings: The Best of Peter Egan from Cycle World Magazine. Peter Egan. MotorBooks International, 5 May 2009〕 and a tyre of choice〔(New sticky street tires (K291) ) ''Popular Science'', February 1982 Page 166. (Volume 220, issue 2) ''Motorcycling'' by ''Ray Hill''. Retrieved 23 March 2015〕 with sporting street motorcyclists during the late 1960s and 1970s〔From Podium to Parkway. Chris Kallfelz. American Motorcyclist Jan 1998〕 due to their shape and relatively sticky compound.〔Cycle World, Volume 31 CBS Publications, 1992〕
==History==
Originally introduced in early 1968 as the ''Roadmaster K81'' rear tyre〔''Motor Cyclist Illustrated'', May, 1968. p.53 ''In Brief. "Dunlop have introduced two new racing tyres and a new road tyre intended for high performance machines. Based on the famed 'triangulars' the KR83 rear and KR84 front are designed to cope with the vastly increased performance of machines like the 500 cc Honda and MV racers. Still of triangular pattern, they have a lower profile than the earlier pattern so that there is 20% more rubber in contact with the road. The Roadmaster K81 is the first road tyre to be based on the triangular design: it will increase the safety margin, when cornering especially, for race-minded owners of fast 650s''". Accessed 23 March 2015〕 by Dunlop Rubber Co. Ltd,〔The Rubber age, Volume 101, Issue 1. Palmerton Pub. Co., 1969〕 the tyre was renamed "TT100" because it was the first production tyre to reach a lap speed of 100 mph over the Isle of Man TT race course when Malcolm Uphill rode his works Thruxton Bonneville to victory in 1969 with a fastest lap of 100.37 mph during the 750 cc class production race.〔''Motorcycle Mechanics'', June 1973, Dunlop full page advert, p.6 ''Every time they race you win. "Tyres like the K70, Ribbed and the fabulous K81, re-named the TT100 after lapping the TT course at over 100 mph on a production machine''". Accessed 23 March 2015〕〔Classic superbikes from around the world Mac McDiarmid. Parragon, 1 Jan 1995〕〔Triumph: A Century of Passion and Power. Lindsay Brooke. MotorBooks International, 5 Jan 2003〕 The feat was repeated in 1971 when Ray Pickrell averaged 100.01 mph on a Triumph Trident Slippery Sam replica, a modified version of the motorcycle the tyre was designed for.〔Walneck's Classic Cycle Trader, July 2009. P.115 Dominion Enterprises〕 The tyres were standard fitment on production models of BSA and Triumph triple motorcycles.〔Triple Echo. Classic Bike, Emap, January 1990〕
Originally called in some countries the "Dunlop Roadmaster K81 Trigonic Tyre" and developed from Dunlop's racing background,〔BSA Road Burner, the Rocket Three. Popular Cycling, August 1970〕 TT100s were first made in England, and then later reintroduced from Japan,.〔 The tyres featured a unique "Trigonic", or triangular, profile which provided ample outstanding grip for the day,〔Walneck's Classic Cycle Trader, January 1999, Dominion Enterprises,〕 and an identical tread pattern to front and rear instead of the usual circumferentially ribbed front tyre of the day.〔 Considered a "super tyre",〔Motorcycle mechanics. George Lear, Lynn S. Mosher. Prentice-Hall, 1977〕 it continues to be made utilising the latest technologies and materials for improved performance.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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