# Understanding DC motor torque [closed]

I am building an rc car from zero and i got stuck into a little problem.My dc motor torque is 20g/cm and using gears I have achieved a ratio of 125:1 so that means i now have 20*125 = 250g/cm. My question is if i attach this geared motor to an axle that is connected to 2 wheels of 6.5cm radius each through a gear how much weight can i pull? I know that is i would've had only one 6.5cm radius wheel attached directly to the geared motor I could've pulled 250/6.5 = 40g. If i have 2 wheels attached to an axle that is spined by the gear motor I could pull 20g?

## closed as off-topic by Bob D, John Rennie, Jon Custer, Kyle Kanos, ZeroTheHeroAug 8 at 13:44

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• if the torque will pull 40g with one wheel, it will still pull the same 40g (minus negligible amount of extra wheel weight, extra bearing friction etc.) with two wheels, it will just have better traction. – Adrian Howard Aug 3 at 20:45
• @AdrianHoward thanks for your response! – DanVde Aug 3 at 21:25