HOME and how to join Forum Open Area General Scott topics late 20’s speedo Re: Re: late 20’s speedo


Hi again

I don’t think that some cog more or less will make any great difference. One thooth will change the drive ratio about 2%.
To put that into perspective modern speedometers are allowed a difference of showing 0% to little (to avoid speeding tickets!) to a whooping 7% too much!
Also take in account that the speedo head is old and might not show exactly right figures, and that that the wheel circumference changes when the tyre wears.
If you have a combination that’s nearly right, at hand, I would advise you to try it before going into a lengthy search for another sprocket.

Best regards