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From Wikipedia, the free encyclopedia
The Dunlop K81 TT100 is a motorcycle tyre[1] thought to be an "obligatory" performance upgrade [2] and a tyre of choice[3] with sporting street motorcyclists during the late 1960s and 1970s[4] due to their shape and relatively sticky compound.[5]
Originally introduced in early 1968 as the Roadmaster K81 rear tyre[6] by Dunlop Rubber Co. Ltd,[7] 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.[8][9][10] 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.[11] The tyres were standard fitment on production models of BSA and Triumph triple motorcycles.[12]
Originally called in some countries the "Dunlop Roadmaster K81 Trigonic Tyre" and developed from Dunlop's racing background,[13] TT100s were first made in England, and then later reintroduced from Japan,.[1] The tyres featured a unique "Trigonic", or triangular, profile which provided ample outstanding grip for the day,[14] and an identical tread pattern to front and rear instead of the usual circumferentially ribbed front tyre of the day.[3] Considered a "super tyre",[15] it continues to be made utilising the latest technologies and materials for improved performance.
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