Behind the clutch shaft there is a internal chamber housing a gear set. A primary and a secondary gear. The clutch drives the primary which in turn drives the secondary powering the chain sprocket output shaft. The numbers are the tooth count. EX: 15 tooth primary, 37 tooth secondary this set gives a 2.41 to 1 ratio. The primary's are available in a range of 13 to 19. the secondary's 32 to 41. To gain torque use a primary with a low number , and a secondary with a high number A 13/41 set is the highest ratio available 3.15 to 1. This ratio will climb most anything and acceleration is fast but you'll lose approx.. 25% of your top end speed. There's numerous clips on youtube showing the gear change process.
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