"Marcello, motor 1400-022 has a spindle diameter of 2mm so is not suitable for these wheels, also that motor has a rpm of 11,500 which gives in theory a wheel speed of 67 mph although motor power will be insufficient toi achieve this. We do not recommend using any plain motor with a wheel direct, you need a geared motor or make your own gearbox.

If you look at our geared motors, you will find a tab titled 'Which Wheel', this gives advice on which wheels will fit that geared motor. The only geared motors that fit these wheels are the Tamiya geared motors with a 3mm hex drive shaft."

– Admin

"Marcello, These wheels are intended for Tamiya geared motors and use a hex shaft made from 3mm shaft which have 2.6mm across flats. If you click on Tamiya wheels in the wheels section, further information on these wheels can be found including the hex size."

– Admin