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Author Topic: Sprocket sizes - front and rear?  (Read 1070 times)

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Offline Phil

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Sprocket sizes - front and rear?
« on: October 13, 2019, 09:41:14 AM »
Could someone kindly advise me on sprocket sizes. I'm running the Nova c/r gear cluster (see photo). This is a pure race bike with an expected 85 - 90 RWBHP. I realise I'll need several sizes but I have to get one made to align the chain, etc. Will be running a 130 rear tyre so chain clearance won't be a problem. (Its a Peckett & McNab frame, incidentally). Thanks in advance.
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Offline Old Scrambler

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Re: Sprocket sizes - front and rear?
« Reply #1 on: October 14, 2019, 08:12:35 AM »
A lot will depend on your motor-carb tune and overall weight.............and short-technical tracks vs. longer where speed is needed. I would begin with a 16 x 48 set and work on getting off of the start-line to stay with the supposed leading competition.
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Dennis in Wisconsin
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Offline bwaller

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Re: Sprocket sizes - front and rear?
« Reply #2 on: October 16, 2019, 04:19:14 PM »
Your countershaft, in top gear, will be turning 3% slower than stock. Probably 16 & 17T fronts and 44-46-48T rears depending on your track lengths as Old Scrambler mentioned.
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Offline Phil

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Re: Sprocket sizes - front and rear?
« Reply #3 on: October 19, 2019, 10:07:56 AM »
Thanks! That a great help
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