In my words
Every pit box needs a Big Bore Scaler Shocks 4 for TRX-4M sitting in it before it needs another set of tires.
Spares exist so a broken part costs you a heat race instead of a weekend.
Stock on small-batch sets moves quickly, so the listing is the honest source for what is left.
What Pro-Line says about it
- Ultimate Performance TRX-4M Shocks
- CNC Machined Aluminum Shock Caps, Bodies, and Bottom Caps
- True Big Bore Holds More Oil for Better Performance
- Pre-Assembled, Just Add Oil! (20wt Oil Recommended)
- Optional Stiff Springs Included
Questions I get about this set
Aluminum or plastic?
Aluminum holds geometry and transfers the hit; plastic bends and comes back. On a rough outdoor track I take plastic in the front and aluminum in the back.
Do I need special tools?
A hex driver set that actually fits, thread-lock and a bench. Rounded hardware costs more time than any part on this page.
