SOHC.co.uk Forums > CB500/550

rear sprocket size

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Trigger:
https://sprocketcalculator.com/calculate

mickwinf:
I quite like the idea of quicker acceleration as most of my riding will be on A or B roads so will leave it on, can always change it later.

deltarider:
What I like about the CB500's standard set 17/34 is that the result in topgear is: 5000rpm = 100km/h, 6000 = 120, 7000 = 140, 8000 = 160 and 9250 = 185km/h.

Seabeowner:

--- Quote from: Oddjob on March 14, 2023, 07:32:14 PM ---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.

--- End quote ---
You're right the 500 is 23/64 and the 550, 24/63 primary shaft/clutch basket. Everything else the same: 24/28 Crank/primary shaft and all gear ratios.

Oddjob:
Why I mentioned that was because the gearbox will spin at a slightly different speed on the 550 than on the 500, so the 5000rpm at 64mph might not be true for the 550 even if it had a 34t rear sprocket, with the tacho running off the camshaft the drive train could be turning at a different speed and you'd never know.

On the later Hondas they run the tacho off the mainshaft, you'd get people claiming that changing the front/rear sprockets hadn't made any difference to the speed v revs when in fact if you use GPS speed you'd find the bike running faster or slower for the same revs after swapping sprockets.

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