INJORA Overdrive Underdrive Alloy Steel Helical Gears for 1/18 TRX4M
Suit For: 1/18 RC crawler TRX4M
Note:

• Each axle requires 1 set of gears (a ring gear and a pinion gear).
• Overdrive the front(or underdrive the rear) will pull you faster in the front, it allows you to climb better and reduce rollover.
• Do not swap gears from different gear sets! They are different even if they have the same number of tooth.
• If you have some free play between gears, you can add a shim or 2 between pinion gear and bearing to push pinion teeth deeper into ring gear teeth.
• 22T/10T Underdrive Gears: Decrease speed approx 9%
• 24T/10T Underdrive Gears: Decrease speed approx 16.67%
• 24T/12TGears: Do no change speed
• 22T/12T Overdrive Gears: Increase speed approx 9%

Features:

• Replace the stock plastic gears, fit TRX4M front or rear axles
• Helical gears offer greater strength and smooth operation than the factory spur gears
• Less vibration, less noise, less wear then stock gears
• CNC machined 20CrMo Alloy Steel Gears

Specifications:

• Material: 20CrMo Alloy Steel
• Weight: about 7g/set