I have my Scottish nicely set up for trials, but I want to make it easily converted to trail gearing. The plan is to swop only the rear sprocket to give me a top gear/rpm similar to a road bike, like maybe the 24DC. Question is, how much smaller should the rear sprocket be? I'm stumped on working out the overall ratio because I don't know the teeth number on the clutch. It's a 32A engine and box. I'm running a 20 tooth engine sprocket, 14 on the gearbox and 66 on the rear wheel. Perhaps I need the smallest rear sprocket I can find? Any pointers would be great.
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Trials and trail gearing
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The clutch sprocket has 43 teeth. The overall gearing for the 24DC was 5.7 to 1 so to achieve this with the 14 tooth gearbox sprocket you need a 37 tooth rear sprocket. ie primary ratio 20 engine 43 clutch = 2,15, final drive 14 gearbox 37 rear wheel = 2.64 so 2.15 x 2.64 = 5.68 overall ratio. Not sure if a 37T sprocket will fit the hub, you may have to go a bit larger with slightly lower gearing.Last edited by John Wakefield; 06/04/2023, 10:51 PM.
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Originally posted by teamferret View PostYou need to take into account the fact that your rear wheel is bigger in diameter
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