Parts/Suspension & steering/Suspension arms & hubs/Samix Brass Rear Hub Carriers, Inner & Outer Portal Covers Set for Traxxas TRX-4 (188g) w/Scale Brake Rotors
Samix Brass Rear Hub Carriers, Inner & Outer Portal Covers Set for Traxxas TRX-4 (188g) w/Scale Brake Rotors
Samix

Samix Brass Rear Hub Carriers, Inner & Outer Portal Covers Set for Traxxas TRX-4 (188g) w/Scale Brake Rotors

Part # SAMTRX4-4464-C44.6(9)
Where to buy
$139.99
AMain Hobbies
Seen Oct 12, 2026
$139.99Buy
Prices are as last seen at the store; stock is not tracked.

About this part

Samix TRX-4 Brass Rear Portal Drive Housing, Knuckle Cover & Hub Carrier Set.

Features:

  • Portal Drive Housing
    • Brass rear hub carrier adds 65g of unsprung weight to the rear axle 
    • Provides better center of gravity and helps improve rear traction and stability compared to the factory parts
    • Compatible with Traxxas parts
    • Black hard coating with chamfered edge to add a touch of bling to your truck
    • Made of high quality brass and etched with L and R for ease of installation
  • Rear Hub Carrier
    • Brass rear hub carrier adds 68g of unsprung weight to the rear axle 
    • Provides better center of gravity and helps improve rear traction and stability compared to the factory parts
    • Extra shock mounting location for increased tuning options
    • Compatible with Traxxas parts
    • Black hard coating with chamfered edge to add a touch of bling to your truck
    • Made of high quality brass and etched with L and R for ease of installation
  • Portal Cover & Brake Rotor
    • Brass portal knuckle cover adds 55g a pair
    • Improve climbing performance and stability with lower CG compared to the factory parts
    • Machined from high quality brass material
    • Black finish to help avoid oxidation
    • Includes SAMIX 36mm scale brake rotor & caliper for improved scale looks 
    • More rigid and increased durability
    • Direct fit on TRX-4 front & rear std knuckle and SAMIX alum. or brass option knuckle 
CA Residents Prop 65 Warning WARNING: This product can expose you to chemicals including Di(2-ethylhexyl)phthalate (DEHP), which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov Details...

Reviews4.6 · 9 reviews

AnonymousVerified owneron Samix Brass Rear Hub Carriers, Inner & Outer Portal Covers Set for Traxxas TRX-4

The price is a little steep in my opinion. The quailty of the kit is excellent. All parts fit together flawlessly and the installation was a breeze. Adds a fair amount of weight to the rear and at the lowest point possible. The brake, rotor, and caliper set really adds a lot to the realism of my scale truck. They look very cool. I’m very pleased with my purchase and would highly recommend.

3 found this helpful
Alex BarefootVerified owneron Samix Brass Rear Hub Carriers, Inner & Outer Portal Covers Set for Traxxas TRX-4

I've been in RC for 30 years and the fit and finish is some of the best I've seen. I know these are expensive but it's worth the price.

2 found this helpful
Robert RoseVerified owneron Samix Brass Rear Hub Carriers, Inner & Outer Portal Covers Set for Traxxas TRX-4

Fast shipping as always from amain, and amazing quality on the samix parts, every fit and looks beautiful.

1 found this helpful
Gabriel NagtalonVerified owneron Samix Brass Rear Hub Carriers, Inner & Outer Portal Covers Set for Traxxas TRX-4

Looking for brass components for your TRX4? Look no further, Samix makes a variety of brass components to keep your TRX4 planted to the ground. I am currently going all brass in the chassis so these Rear Portal Drive Housing, Knuckle Cover & Hub Carrier set came in clutch in keeping my rear end weighted. The Scale Brake Rotor was such a cool touch to the scale look but for my body, I wish they added a "Scale Drum Brake" set to make it even more authentic. Pricing is a little high but if you compare what you get from Samix over Amazon, I prefer quality over quantity. Now if your in between brands such as Yeah Racing's set over these Samix set, then your like me where I couldn't decide but because I like the black coating with sanded lining to show a little brass around the edges then the Samix is the way to go. Yeah Racing's set is also just a bit more. So more bang for your buck with these Samix. Since I did convert the front end of my chassis as well over to brass, you can actually feel the weight as you carry it from your work bench to the bed of your truck. Feels like an extra pound or two but that is all unsprung weight that will help keep your rig from tipping. Mahalo nui loa again Samix! Still waiting on my differential covers lolol

1 found this helpful
Ethan SplinterVerified owneron Samix Brass Rear Hub Carriers, Inner & Outer Portal Covers Set for Traxxas TRX-4

Hands down best thing you can do to your TRX4....have the full set on my 2021 bronco with a long arm kit and 1.9" tire setup machining is top notch and finish is beautiful you won't be disappointed

What reviewers say

Reviewers largely praise the Samix brass rear hub carriers and portal covers for fit, finish and machining quality, with several reporting easy installation and a noticeable improvement in rear grip and stability on rough terrain. The scale brake rotor and caliper add-on is cited as a realistic touch. Price is the main recurring complaint, described as high though often considered justified. One reviewer wished for a scale drum brake option instead. Several reviews also mention fast shipping from the seller Amain. Most reviews are five-star and from verified owners; one one-star review contains only a code and no substantive feedback. Reviews refer to the standard set and do not specify other variants.

  • + Excellent fit and finish
  • + High-quality machining
  • + Adds rear weight and grip
  • + Scale brake rotor adds realism
  • − High price
  • − No scale drum brake option
Summary generated from the reviews above.

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