Brand: Power Hobby
Part Number: PHB5246
Power Hobby 42t / 13t Steel Helical Diff Ring / Pinion Gear REAR FOR Traxxas X-Maxx (part #PHB5246), made for the Traxxas X-Maxx. Pinion size is the easiest way to tune top speed against acceleration and keep motor temperatures in check; hardened steel lasts far longer than stock aluminum.