Re: Why I don't trust mechanical speedometers.
I just measured out my wheel travel, and it came out to just about 81 inches exatly per erevolution
My diameter is just slightly less than 26 inches, with the smooth 26 X1.75 tires I put on-
the 2.25 cruiser tires would be a little greater diameter and slightly more than 81 inches of travel
these speedos always claim BOTH 26 and 27 inch speed, with no apparent change of calibration, so I'd be curious as to which wheelsize they are more acurate on- I suspect 26"