INJORA Black Brass Caster Blocks C-Hubs 4g Front Axle Upgrade for TRX4M 1/18 RC Crawler
INJORA Black Brass Caster Blocks C-Hubs 4g Front Axle Upgrade for TRX4M 1/18 RC Crawler
These INJORA caster blocks and C-hubs are a front axle upgrade for 1/18 TRX4M RC crawlers. Made from black brass, each piece weighs 4 grams. The pair replaces plastic originals to add low-weight forward, improving stability on steep climbs and reducing rollover. Precision CNC machined with the INJORA logo.
Why switch to brass caster blocks and C-hubs?
The factory plastic parts on the TRX4M front axle are lightweight but do little to improve weight distribution. Adding brass caster blocks and C-hubs puts extra mass where it counts—right at the front wheels. This lowers the center of gravity and increases front-end traction. The result is better anti-rollover stability and more reliable climbing performance on uneven terrain. Each block weighs 4 grams, so the total added weight is 8 grams across the front axle. The black brass material is durable and wear-resistant, outlasting standard plastics. This upgrade is a common first step for crawler enthusiasts looking to improve balance without changing suspension geometry.
Technical specifications
| Material | Black brass |
| Weight per piece | 4 g |
| Quantity | 2 pieces (pair) |
| Compatibility | TRX4M Defender, Bronco, K10 High Trail, F150 (1/18 scale) |
| Machining | High precision CNC, etched INJORA logo |
| Placement | Front axle only |
What's included and installation notes
The package contains two black brass caster blocks/C-hubs. They are direct replacements for the plastic parts on the TRX4M front axle. No additional parts are required, but you will need basic tools for disassembly. The CNC machining ensures a precise fit straight out of the box. The etched INJORA logo adds a clean, upgraded look that matches other INJORA components. These parts are designed to work with the stock screws and bearings, so installation is straightforward.
Compatibility with TRX4M models
These parts are specifically engineered for the Traxxas TRX4M platform. They fit the Defender, Bronco, K10 High Trail, and F150 body styles. All are 1/18 scale RC crawlers. The upgrade is intended for the front axle only; rear axle parts are not included. If you own a different TRX4M variant not listed, the front axle design is identical across the line, so these should fit as well.
Frequently asked questions
Will these caster blocks work on the rear axle?
No, these are for the front axle only. The rear axle uses different C-hubs and caster blocks. Use a rear-specific set for balanced weight distribution.
Do I need to buy any additional hardware?
No. The blocks replace existing plastic parts. Reuse the original screws and bearings. All necessary hardware is already on your truck.
How much weight do they add?
Each piece weighs 4 grams, so the pair adds 8 grams total to the front axle. This is enough to improve stability without overloading the suspension.
Are they made of solid brass?
Yes, they are machined from solid black brass. The material is denser than plastic, providing the weight increase needed for better crawling performance. The black finish resists wear and corrosion.