Timsi 0 Posted August 21, 2008 For those interested, I've cooked down a Km/h formula: km/h = (Wheel diameter in mm x 3,14 x motor rpm x 0,00006) / ((main gear / bewel gear) x (spur gear / pinion gear)) Note that motor rpm often are referred at no load. Batteri output, weight, surface etc also affects. Normaly you can take this formula and reduce teoretical km/h with 10 - 15 % to get close to the actual km/h. /Tim Share this post Link to post Share on other sites