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INJORA 12T/22T Overdrive Gear and 24T/10T Underdrive Alloy Steel Spiral Gear Set for 1/18 RC Crawler Car TRX4M Upgrade

INJORA 12T/22T Overdrive Gear and 24T/10T Underdrive Alloy Steel Spiral Gear Set for 1/18 RC Crawler Car TRX4M Upgrade

Q: I'm not understanding how these work. Wouldn't changing the front and rear gear ratios just cause the truck to bind?

Good question. If you were to drastically change the front and rear ratio (super overdrive front and rear), it would cause issues but not bind. The slight increase spin of the front tires causes the truck to pull more front the front, instead of push more from the rear. This is very helpful when going over obstacles and on hill climbing

Product ID: 605741667

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🔧Easy install upgrade kit

🚙9% front axle overdrive boost

⚙️CNC machined alloy steel precision

Frequently Bought Together

Description

⚙️ Upgrade your RC crawler’s edge — conquer every trail with precision power!

LIGHTWEIGHT YET ROBUST - Only 20g, delivering performance without added bulk.
ENHANCED TERRAIN MASTERY - Overdrive and underdrive gears optimize crawling and steering on complex terrains.
PRECISION CNC ALLOY STEEL - Crafted from durable 20CrMo steel for unmatched strength and longevity.
NOISE VIBRATION REDUCTION - Spiral gear design minimizes operational noise and wear for smoother rides.
SEAMLESS TRX 4 M COMPATIBILITY - Direct replacement for front or rear axles, no modifications needed.

This 12T/22T Overdrive and 24T/10T Underdrive alloy steel spiral gear set is a precision CNC-machined upgrade for 1/18 scale TRX4M RC crawler cars. Made from durable 20CrMo steel, it reduces noise, vibration, and wear while boosting front axle speed by 9% and rear axle torque by 16.7%. Easy to install, it replaces standard plastic gears to enhance crawling performance on complex terrains.

Specifications

Product Dimensions	9.91 x 2.01 x 7.11 cm; 20 g
Item model number	4M-10-34B
Educational Objective(s)	Game, play
Number of Game Players	1
Assembly Required	No
Batteries Required?	No
Batteries Included?	No
Material Type(s)	Steel
Color	Black
ASIN	B0BZLBWSRV

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I'm not understanding how these work. Wouldn't changing the front and rear gear ratios just cause the truck to bind?

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