There are two motor shaft sizes used within our hobby; 1/8” and 5mm, with 1/8” being the most common. It really comes down to a strength issue, if your vehicle has massive power and torque and is run in abusive environments, a 5mm shaft may be the best choice. 5mm shafts are relatively new to the hobby and came about because of ultra high output brushless motors and Lithium battery technology. Obviously you must match your pinion gear to motor shaft size, but adapter sleeves are available to convert 5mm pinions to 1/8” if necessary.
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