If a wheel is 42 inches how long is the spoke?

Answer 1

First off 42" is a very weird size for a bike wheel. Secondly, there's no way of telling. To be able to tell you need to know how high the hub flanges are, what the rim looks like in cross section and what pattern the spokes are laced in.

Answer 2

You are looking for the radius. 42=2 pi r. So 42/2pi is 6.68 inches to the nearest hundredth

Answer 3

The Circumference of a circle is given by the formula, C = 2πr : Then r = C/2π.

If C = 42 then r = 42/2π = 21/π = 6.68 in (2dp = nearest hundredth)