Originally Posted by severedcorps
on my speedo it only asks me for the wheel size, in my case 24 inches..
my speeds seem accurate..
It's possible that it's close. The faster you go the more you'd notice any discrepancies. Because not all 24" tires (or any size for that matter) are created equal, however, the stock tire size entry in a cycle computer is a shot in the dark at best. The most accurate way to set a cycle computer is using the roll out method mentioned above.