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Parts/Drivetrain/Drivetrain hardware (hex hubs, pins)/Samix Brass 12mm Hex Adapters for Traxxas TRX-4 (4) (8mm) (6.5g)
Samix Brass 12mm Hex Adapters for Traxxas TRX-4 (4) (8mm) (6.5g)
Samix

Samix Brass 12mm Hex Adapters for Traxxas TRX-4 (4) (8mm) (6.5g)

Part # SAMTRX4-4063-84.3(3)
Drivetrain hardware (hex hubs, pins)Landcraft
Fits
Traxxas TRX-4Traxxas TRX-6
Where to buy
$14.99
AMain Hobbies
Seen Oct 12, 2026
$14.99Buy
Prices are as last seen at the store; stock is not tracked.

About this part

Samix TRX-4 Brass Hex Adapters help add a bit more unsprung weight, and add 8mm of length to your track width. The hubs weigh 6.5 grams each (26g total), so they add minimal rotating weight to the drivetrain. They are easy to install using the stock hardware and will help to increase the overall stability of the model.

Features:
  • 8mm thickness
  • Made of high quality CNC machined brass
  • Direct fit standard TRX-4
  • Black finish with gold chamferred edges
  • Width marked on the side for easy identification
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...

Reviews4.3 · 3 reviews

Jaxon LundellVerified owneron Samix Brass 12mm Hex Adapters for Traxxas TRX-4 (4) (8mm) (6.5g)

These were perfect. They give my truck a great stance and I have noticed the slight increase in stability. Along with these, I got the extended stub axle #8255A from Traxxas which has a longer threaded area so I can still use the nylon at the end of the wheel nut. I recommend both of these

3 found this helpful
Louis CominielloVerified owneron Samix Brass 12mm Hex Adapters for Traxxas TRX-4 (4) (8mm) (6.5g)

My only complaint is that the nylon does not make it on the lock nut now. Wish they offered extensions for the wheel as well or included as a complete kit. Stance is exactly what I wanted though and as always they are machined perfectly, I love that about Samix Products.

1 found this helpful
Alex BeattyVerified owneron Samix Brass 12mm Hex Adapters for Traxxas TRX-4 (4) (8mm) (6.5g)

These give my trx4 the perfect stance I was looking for. I would definitely buy these for my girlfriend Barrage if I can find some that fit and replace the pin mount on the wheels. I noticed that I flipped over a lot less with these. I wouldn’t say that they weight so much that it keeps the truck down but the wide stance itself helps.

1 found this helpful
What reviewers say

Three verified owners review these brass 12mm hex adapters for the TRX-4. Reviewers agree the adapters give a wider stance that they wanted, with one reporting improved stability and fewer rollovers. Machining quality is praised. The main recurring issue is fitment with the stock nylon-insert wheel nut: one reviewer found the nylon no longer engages the lock nut, and reported using Traxxas extended stub axles to solve it. One reviewer wished for matching wheel extensions or a complete kit. Sample size is small.

  • + Gives a wider stance
  • + Improved stability reported
  • + Fewer rollovers reported
  • + Precise machining
  • − Nylon lock nut no longer engages without extended stub axles
  • − No matching wheel extensions or complete kit offered
Summary generated from the reviews above.

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