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C15 Gearing For Trials

mcman56
in Pre-65 Bikes

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Does anyone have a sprocket recommendation on a C15 for Trials? I would prefer to stay away from a huge back sprocket and am really only concerned about getting first low enough. This bike has the 33/17 first gear....listed as wide ratio in the RR book. (Oddly the other gears match the close ratio numbers in the book.)

From what I can tell, the smallest transmission sprocket is 13 tooth and the smallest motor sprocket is 18. With the existing 56 rear sprocket, I calculate an overall 1st gear about 24:1. The same calculation for my Reflex with 9/44 final drive gives me 45:1. Am I missing something?

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