Handy HP to Speed Calculator


Active Member
Mar 11, 2017
Salem Oregon
The following link is a remarkably accurate HP'Speed predictor that I found. Use it for your own amusement and DIY designing!

For Drag Coefficient put .8

For drivetrain loss I have 5%

For Fontal Area I put 9.5 sq ft. and that fits my Dilbert-ish Body Shape.

An interactive model-based calculator of cycling power vs. speed (gribble.org)

I've compared it to many real-life 2-wheeled vehicles and their top speeds, and it comes out spot on.