Please make sure the spur gear have the same pitch(Mod 1) to work with,5mm hole diameter is suited for 5mm shaft The M1 pinion gear sets (19T 20T 21T 22T) are made of hardened steel,durable and reusable. Compatible with Arrma Traxxas Axial HSP Redcat Losi 1/8 1/10 scale RC car truck buggy. Universal upgrade Mod 1 pinion gear,total 4Pcs,19T 20T 21T 22T with 5mm inner diameter.Come with grub screws.Easy to install and upgrade. The variety of tooth pinions allows for more gear setups,for different racing track conditions.To avoid the ESC/motor overheat,please check the ESC and motor temperatures regularly throughout the run after change the pinion gear. For 5mm shaft motor of 1/8 1/10 RC Car.Compatible with Arrma Traxxas Axial HSP Redcat Losi 1/8 1/10 Scale RC Car Truck Buggy.
The M1 pinion gear sets are made of hardened steel,durable and reusable.
Universal upgrade Mod 1 pinion gear,total 4Pcs,19T 20T 21T 22T with 5mm inner diameter.
The variety of tooth pinions allows for more gear setups,for different racing track conditions.
To avoid the ESC/motor overheat,please check the ESC and motor temperatures regularly throughout the run after change the pinion gear.
Easy to install and upgrade.Come with grub screws.

Material:Steel
Tooth count: 19T 20T 21T 22T
Tooth pitch: Mod 1
Height: 14mm
For shaft: 5mm

Package includes:
4x Pinion gear(19T 20T 21T 22T)
4x Grub screws