SOHC.co.uk Forums > CB500/550

Revs /mph

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Johnny4428:
Just had a look at mine it looks like 36 rear. So the least teeth on the rear the faster for same engine rpm?

robvangulik:
4000 rpm at 60 mph is about the same gearing overall as a cb750, isn't that a bit tall for a 550? 120mph at 8000rpm?

Johnny4428:
I haven’t had the speedo or tachometer calibrated or refurbished other than new faces and painted, so cannot confirm accuracy. It maybe slightly above 4000 at 60mph. I will check tomorrow if the weather is kind.

Seabeowner:
I put the various numbers on an excel spreadsheet.
Gearing between the crank and the primary shaft is the same on 500/550.
Gearing between primary shaft and clutch basket is different. Overall primary gearing 500/3.247,  550/3.063.
1-5 gear ratios are the same.
Standard front/rear sprockets are 500 17/34,  500 17/37. Delta says some 550s may be different, but I have no knowledge.
Rear tyre standard, 500 is 3.50,  550 is 3.75. Changing from standard sizes will alter gearing to rear and accuracy of speedo on front.
All in all the overall ratio on 500 to 550 is just about identical.
Should be 4000rpm = 51MPH. 6000rpm = 76MPH.

deltarider:

--- Quote from: Seabeowner on July 19, 2020, 10:03:14 AM ---Delta says some 550s may be different, but I have no knowledge.

--- End quote ---
The CB550K3-ED, say for continental Europe, had 17 and 34, like all CB500 models had. It was to market this particular model more as a tourer bike, to differentiate to the somewhat sportier CB550F2. In the rest of the world all CB550s had standard 17 and 37.

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