Here are some of the reasons you may want to use them:

Powerhobby Hardened Steel 38T Mod1 5mm Pinion Gear with 2 Grub Screws

ARRMA 1/10 Vorteks 223S 4X4 Brushless RTR – ARA4305V4

(NOT INCLUDED)

rotary potentiometers to decrease or increase the width of the output pulse

Powerhobby Wasteland 1/5 Belted Tires (2) FOR Traxxas X-Maxx Arrma Losi DBXL-E Brama 10B Parts Here are some of thePowerhobby Wasteland 1 5 Belted Tires (2) FOR Traxxas X Maxx Arrma Losi DBXL E Powered by Jetko Tires Includes 2 hex sizes Powered by Jetko Features: USA Rubber Loctite Glue Pre Mounted on the next generation wheels w Removable Hex Medium Soft Compound Black Claw Rims Includes: (2) Mounted Tires (2) 24mm hex ( FOR X Maxx) (2) 24mm ( Arrma Losi ) Fits but not limited too: 24mm Hex FOR Traxxas X Maxx 24mm Hex FOR Arrma 8s Kraton Outcast, also fits LOSI