Stromberg Carlson's TR-1 and TR-2 mount a spare travel-trailer tire to a compatible 4-inch square rear bumper. The TR-1 is rigid; the TR-2 folds down for rear access. This guide shows the manufacturer's mounting hardware, original instructions and replacement hardware available from NewRVParts.
See the replacement parts
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Choose the correct tire carrier
TR-1 — Rigid carrierFixed spare-tire position on a compatible 4-inch square trailer bumper.View TR-1 carrier
TR-2 — Folding carrierHinged design with pull-pin action and built-in downward stop for rear access.View TR-2 carrier
Original TR-1 / TR-2 installation document
The two-page Stromberg Carlson document identifies the tire-carrier mounting hardware and shows how the U-bolts, tire bolts, bolt clips and retaining plate are fitted. Open it to check the original assembly before installation.
Open the manufacturer tire-carrier instructions (PDF)
On phones, the PDF opens separately for easier reading and zooming.
Parts supplied with the complete carrier
| Quantity | Mounting component |
|---|---|
| 1 | Complete spare-tire carrier assembly |
| 2 | 3/8-inch U-bolts for bumper attachment |
| 4 | 3/8-inch flat washers |
| 4 | 3/8-inch nuts |
| 2 | 1/2-inch bolts for wheel mounting |
| 2 | Bolt clips to retain the wheel-mount bolts |
| 2 | 1/2-inch lug nuts |
| 1 | Black flat wheel-retaining plate |
Two U-bolts attach the carrier to the bumper. The two wheel-mount bolts are secured by bolt clips; one supports the wheel at a lug hole, while the second works with the flat retaining plate and lug nut across the wheel centre. Follow the original instructions for final tightening.
Replacement tire-carrier hardware
Return to the RV parts diagram index to find other installation and service guides.