1959 TRIUMPH BONNEVILLE motorcycle in Chicago Heights, IL

The rest of the 1959 Triumph Bonneville was pure Tiger T110. The 4-speed gearbox, which traced its ancestry back to the original one used in the seminal 1937 Speed Twin, was taken directly from the T110. Inside the primary case, the engine sprocket had 24 teeth and the clutch sprocket 43, with a 70-link endless 1/2" X 5/16" single-row chain, tensioned by pivoting the transmission in its mounts. Final drive was by 101-link 5/8" X 3/8" chain with a 18-tooth front sprocket and a 46-tooth rear wheel sprocket.The added power brought about by the twin carbs and all the other 'hot rod mods' (the Tiger made 40 hp to the 1959 Triumph Bonneville's 46) proved to be more than the overtaxed clutch could handle. So, this too was upgraded with a new Neolangite friction surface on its 6 drive and 5 driven plates, and the clutch center was hardened.The 1959 Bonneville's frame is identical to that of the 1959 Tiger T110. Introduced on the 1954 T110, the rear swing arm was poorly supported in the frame and tended to flex, earning it the nickname "Whip Iron", due to its tendency to wobble and weave. This would be remedied in 1960 with the adoption of the new, and much-reviled 'duplex frame', which solved the swing arm issue, but brought with it a whole new set of problems.

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