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This tutorial might help explain the correct torque calculation.http://www.societyofrobots.com/mechanics_dynamics.shtml

my aim is to build an electric bicycle.

Torque can be calculated in SI units asT = PW 9.554 / n (1)whereT = torque (Nm)PW = power (watts)n = revolution per minute (rpm)

Neglecting the friction the force required to move a body up an inclined plane can be expressed with the formulaFp = W h / l = W sin α (1)whereFp = pulling force (N, lbf)W = m g = weight of body (N, lbf)h = elevation (m, ft)l = length (m, ft)α = elevation angle (degrees)m = mass of body (kg, slugs)g = acceleration of gravity = 9.81 (m/s2) = 32.174 (ft/s2)Adding friction (1) can be modified toFp = W (sin α + μ cos α) (2)whereμ = friction coefficient

Acceleration is the rate of change of velocity and time taken and can be expressed asa = dv / dt = (v2 - v1) / (t2 - t1) (1)wherea = acceleration (m/s2, ft/s2)dv = change in velocity (m/s, ft/s)v2 = final speed (m/s, ft/s)v1 = initial speed (m/s, ft/s)dt = time taken (s)t2 = final time (s)t1 = initial time (s)

F = m a (1)whereF = force (N, lbf)m = mass (kg, slugs)a = acceleration (m/s2, ft/s2)

Torque = Distance * Force Distance = Wheel Radius

http://www.ebay.com/itm/Electric-Scooter-24V-350W-Brush-Motor-DIY-Reduction-Motor-EBike-Engine-Generator/251562338826?_trksid=p2045573.c100033.m2042&_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D28797%26meid%3D565024f7771142fd9c9319a060fea083%26pid%3D100033%26rk%3D4%26rkt%3D4%26sd%3D251533537313will this motor do?