Does a higher gear ratio read faster or slower on a speedo…
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Junior Member
Joined: Jul 2023
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Does a higher gear ratio read faster or slower on a speedo…
‘08 CBR1000RR Gear ratio question…
Current: 42/16 = 2.625
Proposed: 42/15 = 2.8
%age difference: 6.45
Stock, my bike’s Speedo reads 6.66% (approx) fast.
If I regear to the proposed higher gear ratio, I think it will bring the speedo close to center (6.66-6.45=.21% fast).
Am I thinking correctly here? I’ve no experience in this area.
Thanks in advance.
Current: 42/16 = 2.625
Proposed: 42/15 = 2.8
%age difference: 6.45
Stock, my bike’s Speedo reads 6.66% (approx) fast.
If I regear to the proposed higher gear ratio, I think it will bring the speedo close to center (6.66-6.45=.21% fast).
Am I thinking correctly here? I’ve no experience in this area.
Thanks in advance.
Senior Member
Joined: May 2011
Posts: 1,988
Likes: 438
From: Mesa, AZ
Might be opposite. Adjustment to make here is ratio of output-shaft speed vs. rear-wheel speed. By going with higher gear-ratio, you'll spin engine and transmission output shaft faster for same rear wheel & road-speed. So will make speedo error even worse.
You'll want to go in opposite direction with 42/17 or 40/16 to slow down engine & transmission speed for same road-speed.
You'll want to go in opposite direction with 42/17 or 40/16 to slow down engine & transmission speed for same road-speed.
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