View Full Version : 15/42 sprocket change - speedo error?

11-01-2004, 01:13 PM
Does anyone know if doing this change will cause erroneous speedometer / odometer readings? If so, can it be corrected?

Ricky J
11-01-2004, 01:23 PM
If the 2004 still utilizes a speedo pickup that uses rear disc bolts as triggers (like earlier RSVs) then changing the gearing will have no effect on accuracy.

Ed / AF1 Racing
11-01-2004, 02:07 PM
Ricky J is right, the speed is read off the rear brake rotor bolts.....gearing does not mess up your speedo.

11-01-2004, 03:40 PM
Cool. Thanks guys!

11-02-2004, 04:36 AM
When you finally take that bike out for a top speed run, can you let me know what your maximum speed tops out at?

I have 15/43 gearing and I can't go anything above 263kph. Just want to know if its my bike or all Factory's.

Thanks so much. :)

11-09-2004, 06:18 AM
New to forum. If this has been covered, pls advise. Any info regarding changes such as what was speed with OEM in 2nd at 3000rpm, and speed with new sprocket at same rpm?

11-09-2004, 06:43 AM
Figure the %~age difference in gearing, and apply that to RPM.

Scott :peace:

11-09-2004, 01:09 PM
Confirmed on the Speedo with gearing changes.

After dropping a tooth on the front sprocket, I kept looking at my speedo thinking it was off (reading faster than it actually was).

So I mounted and the GPS on the bike Sunday. At 90 mph indicated on the Speedo, the GPS was indicating 88.7 mph. I am pretty damn impressed by that!!