INJORA 15g Stainless Steel 16.6:1 Transmission Gear Pinion Set for TRX4M 1/18 RC Crawler
INJORA 15g Stainless Steel 16.6:1 Transmission Gear Pinion Set for TRX4M 1/18 RC Crawler
This INJORA transmission gear pinion set replaces the stock gears in 1/18 scale TRX4M RC crawlers like the Defender, Bronco, K10 High Trail, and F150. Machined from stainless steel, the set includes a 16.6:1 reduction gear set and an 11-tooth motor pinion. The 16.6:1 ratio matches the stock gearing, so it won't change your truck's wheel speed—it's built to offer greater strength and corrosion resistance than the original parts.
Gear Set Contents and Compatibility
The kit contains all internal transmission gears plus the motor pinion. It's designed for direct fit into the TRX4M platform without modification. The stainless steel construction resists rust and wear, which helps the drivetrain last longer in dusty or wet conditions. Compatibility covers these models: TRX4M Defender, Bronco, K10 High Trail, F150.
Key Specifications
| Material | Stainless steel |
| Gear Ratio | 16.6:1 (same as stock) |
| Motor Pinion | 11 teeth |
| Weight | 15 g (approx.) |
| Machining | CNC machined |
| Compatibility | TRX4M Defender, Bronco, K10 High Trail, F150 |
How to Install This Gear Set
Installation is straightforward if you're comfortable opening the transmission. Start by applying grease to the gears. Remove the existing gears from your 1/18 RC crawler. Then install the new 16.6:1 transmission gears and the 11-tooth motor pinion. The process mirrors a standard TRX4M gear swap—no special tools needed beyond common hex drivers.
How Does This Set Compare to Stock TRX4M Gears?
The most noticeable difference is material: stainless steel versus the stock steel or brass parts. Stainless is more rust-resistant, which can be a plus if you run in wet or muddy terrain. The 16.6:1 ratio is identical to the factory gearing, so speed and torque remain unchanged—you're swapping for durability, not performance gain. The set includes both the transmission reduction gears and the motor pinion, so you don't need to buy extra pieces.
Common Questions
Will this fit my TRX4M K10 High Trail?
Yes, it's designed for the TRX4M platform and fits all current models including the K10 High Trail, Defender, Bronco, and F150.
Does the 16.6:1 ratio change crawling performance?
No. The ratio matches the stock gears exactly, so wheel speed and torque remain the same. The upgrade is purely for increased strength and corrosion resistance.
What grease should I use?
The product information doesn't specify a particular grease. For best results, use a standard RC gear grease that's compatible with metal gears.
Is the motor pinion also stainless steel?
Yes, the entire set is machined from stainless steel, including the 11-tooth motor pinion.