SOHC.co.uk Forums > CB500/550

rear sprocket size

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mickwinf:
Just assembling my rear hub, and I have a new sprocket which is a 37tooth which I believe is a 550 item, the 500 should have a 34 tooth. My question is would it make much difference in the real world if I fitted it?

McCabe-Thiele (Ted):
Improve 0-60 time poorer fuel economy?

Oddjob:
Not a great deal, the primary shaft gear is also different on the 550 and the clutch basket has either more or less teeth as a result, that altered the overall gear ratio but TBH I think Honda put a 37T rear sprocket to improve the standing quarter as there was a lot of competition at the time.

Seabeowner:
I have a little excel sheet for this:
5000 rpm = 64 MPH with 17/34 and 58 MPH with 17/37. (in top). Also depends on tyres slightly.

So will be revving quite a bit higher.

Oddjob:
You must also take into account the change in the clutch gearing, as I said they changed it from the 500, IIRC the primary gear had 23T on the 500 but 24T on the 550, that alters the gearing a little.

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