RCFeed Logo
Builds FeedParts FeedRC MarketplaceDiscussAbout Us
Parts/Drivetrain/Drivetrain hardware (hex hubs, pins)/Samix Brass 12mm Hex Adapters for Traxxas TRX-4 (4) (6mm) (5g)
Samix Brass 12mm Hex Adapters for Traxxas TRX-4 (4) (6mm) (5g)
Samix

Samix Brass 12mm Hex Adapters for Traxxas TRX-4 (4) (6mm) (5g)

Part # SAMTRX4-4063-63.3(3)
Drivetrain hardware (hex hubs, pins)Wheel hardware & accessoriesLandcraft
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 6mm of length to your track width. The hubs weigh 5 grams each (20g 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:
  • 6mm 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...

Reviews3.3 · 3 reviews

Some dudeVerified owneron Samix Brass 12mm Hex Adapters for Traxxas TRX-4 (4) (6mm) (5g)

These are an excellent addition to my TRX-6 (so I had ti buy 2 sets). The weight & increase in offset is VERY noticeable when testing out the stability. AND the wheels still fit up into the fenders under full compression (just barely)’ I highly recommend these for a “stock” appearance using stock bodies.

1 found this helpful
Derek BradleyVerified owneron Samix Brass 12mm Hex Adapters for Traxxas TRX-4 (4) (6mm) (5g)

Very disappointed in these hexes. They are supposed to be offset a total of 6mm when each hex only adds 1mm for a total of 2mm offset.

1 found this helpful
Christer HavreVerified ownerMay 23, 2019on Samix Brass 12mm Hex Adapters for Traxxas TRX-4 (4) (6mm) (5g)

Got these for my TRX-4 Sport, expecting to increase the track width with 3mm on each side, 6mm total. This is not the case. The sizing here refers to the thickness of each adapter, and they are actually only 1mm wider than the stock ones, adding a total of 2mm width to your car. Disappointing. I've ordered the 8mm ones that will give me the 6mm I wanted. In terms of quality, they look impeccable, and they're easy to fit. Does not come with set screw/set pin.

7 found this helpful
What reviewers say

Reviewers agree the brass hex adapters are well made and fit easily, but they disagree on the offset gain. Two reviewers report that each adapter adds only about 1mm, for roughly 2mm total width, rather than the 6mm the product name suggests; one reviewer notes the 6mm figure is a misunderstanding of the listed sizing, which refers to adapter thickness. One reviewer on a TRX-6 reports a noticeable stability improvement and wheels still clearing the fenders at full compression. One review notes the set screw or set pin is not included. The offset discrepancy is the main recurring issue.

  • + Well-made brass finish
  • + Easy to fit
  • + Noticeable stability gain on TRX-6
  • + Wheels still clear fenders at full compression
  • − Only about 1mm added per side, not 6mm total
  • − Sizing in the name is adapter thickness, which may mislead buyers
  • − Set screw or set pin not included
Summary generated from the reviews above.

Builds using this part

No builds use this part yet — add it to yours from the build editor.