This is a stock 6 volt Kid Trax 550 motor with their 10 tooth pinion gear attached.

This is a stock Power Wheels 550 with a 17 Tooth Pinion Gear.

This is a stock Power Wheels 550 with a 19 Tooth Pinion Gear.

This is a stock Power Wheels 550 with a 21 Tooth Pinion Gear.

This is a stock Power Wheels 3B motor with its original pinion. (Picture is generic)

This is a stock Power Wheels 550 with a 23 Tooth Pinion Gear.

This 10 Tooth motor is for 3A, 3B, and Lil vehicle gearboxes.

This is a stock Power Wheels 550 with a 15 Tooth Pinion Gear.