Re: Speedometer Accuracy

Posted by Ross On 2023/3/28 19:29:15

If your tires are about 26" diameter instead of the 28" the car was built for that will account for 4.7 mph difference changing 66mph to a little over 61.

Oh, and if you read old road tests of most any brand most all of them had errors of 4-7 mph at speed.