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widen your TRX4m RC Car Axle by 11 mm on each side over stock, Resulting in a total width increase of 22 mm. For front and rear axles.
Easy to install, Add stability
Say goodbye to ruined scrub radius, excessive load on the steering servo, and diminished servo power. Reset the scrub radius back to stock, ensuring ultra-responsive steering and reducing wear on your servo.
Fit for 1/18 TRX4M Defender & Bronco, K10
Specifications：
Item name: widening upgrade kit (Ultra 11) for TRX4M
Color: Black
Material: high quality hardened steel, Brass
RampCrab TRX4M Parts Package Included:
Brass C-Hubs +11mm Length (2)
Brass Knuckles (1 set)
Brass Widening upgrade Parts for Rear Axle +11mm (2)
Brass steering link +22mm (1)
Front & Rear Drive Shaft for TRX4M +11mm Length (2)
bearings 8*12*3.5 (2)
bearings 3*6*2.5 (2)
bearings 3.5*7*2.5 (4)
Screws (1 set)
Pin 1.5X5 (4)
Washers M3 (4)
Nuts M2.5 (4)
Note: Please check your specific model's manual for compatibility, or contact us.
druppy
2025-06-30 21:47:47
Everything fit great even on a china no name real axle tube. I plan one getting another set for the sons trx4mt and my next build
Spencer H
2025-06-19 16:41:59
I bought the +11mm additional on each side.It’s an awesome add on and definitely cool to put on your trx4m. Very easy and strait forward on install and adds a good amount of weight down low.I did find a problem in doing full turns, it tends to click due to the connection of the axel bearing pin. So if you do buy this, find a way to minimize that problem or turn less.Other than that one problem, it’s definitely an eye catcher and leaves a bigger footprint. Watch your lines while climbing and have fun.
Gary Rich
2025-05-21 17:44:33
Great upgrade for the TRX4M. Extra weight and width makes for stable side hill running.
Jacob smith
2025-05-14 15:19:32
No instructions so if you’re new to the hobby it could be a little tricky at first but it’s pretty self explanatory.. the kit is awesome! I ordered the 11+ kit and had no issues with it. Everything went right on and lined up. No issue’s whatsoever. Very pleased and happy with the width and improvement climbing and tipping issues like crazy. Definitely recommend
Suzanne DeBroux
2025-04-26 13:35:33
Very good fitting parts, give a great stance to my IR40 build. Being brass, this adds much needed weight to all 4 corners. Comes with bearings, oil, grease and loc tite. Great value and even better performance. Highly recommend
Ashley Horton
2025-04-24 11:36:11
This product installed great on my trx4m Bronco. I like that it included bearings for the knuckles replacing the factory bushings. My only complaint is that they sent hardware for a +10 kit so I had the cut some slots down for the 5mm hubs.
Kim Shelton
2025-04-05 11:05:12
These parts took a great little crawler and turned it into the most amazing crawler that can't be matched.
Coppah'
2025-02-27 17:02:19
I installed this on my kids Trx4m bronco today. Install was easy even though there are no instructions provided. Parts appear to be well made. Tolerances were tight but only in a good way, parts are snug but did not bind. I wish I’d have put this kit on my rc car instead of just extended hex’s. Good added weight down real low.
Chris
2025-02-22 14:52:04
Very impressed with the quality and weight.Instructions are minimal, but easy to fit
Chad
2025-02-13 10:21:14
Easy to install and did everything I wanted it to do for stability and the looks of the rig.
Craig
2025-02-05 13:39:48
Great quality and makes the truck look even better AND makes the truck more stable. I used it for my TRX-4MT to make it a true 4ws monster truck.
Angelina
2025-02-02 20:31:51
You will not be disappointed with either option
Brandon Doucette
2024-12-29 10:12:58
Very happy with fit and finish and the install wasn’t horrible, the added weight and width helped the truck’s capabilities
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