Just wanted to take the opportunity to thank Brian for the speed calculator. Its probably saved all of us hours of number crunching! The hidden warnings about the 45mph is a good and welcome idea.

Since you're including the calculation for the recommended pinion for 1:1 rollout ratio, maybe it would be a good idea to include the little bit about (tire circumference) / (gear reduction ratio) in either the discriptions or a displayed calculation?

.dk