Re: Speedo's and gas engines...Help !!
if you want an accurate speed from your bike computer, do a roll out measurement and enter that # in mm into the computer. Air valve @ 6 o'clock, you on it with tires pumped up, roll one wheel revolution until the valve is @ 6 o'clock again, measure in mm. Most every modern cycling computer will let you enter a custom # for a more accurate speed.