Robinson Racing1219 Extra Hard High Carbon Steel Motor Pinion Gear, 5Mm Bore, 1.0 Mod Pitch, 19 Tooth

I started using RR Extra Hard pinions after stripping and breaking teeth on lesser quality ones. These pinions are the best I have used and can stand up to big power, steel spur gears, and big tires in 1/8 trucks. They may cost a dollar or two more than budget options, but they are absolutely worth it. Can't recommend them enough.

Love it