TR-2 folding trailer spare-tire carrier
View TR-2 productStromberg TR-2 Spare-Tire Carrier: TR-1 Comparison & Hardware Parts
Stromberg Carlson's TR-2 mounts a trailer's spare wheel on a suitable 4-inch square rear bumper. Unlike the rigid TR-1, the TR-2 has a folding carrier with a built-in stop, allowing access to a rear storage hatch when properly installed. If the mount is sound but the attachment fasteners are missing or corroded, Stromberg also offers replacement carrier hardware under 1TR-A.
Which carrier or part are you replacing?
| Model or part | Purpose | Customer selection check |
|---|---|---|
| TR-1 (factory reference) | Rigid bumper-mounted spare-tire carrier | Does not fold away to provide access behind the wheel |
| TR-2 | Folding spare-tire carrier for compatible 4-inch square bumper | Check folding clearance, suitable mounting structure and wheel fastening |
| 1TR-A | Attachment-hardware service package for TR-1 and TR-2 | Choose for replacement carrier attachment hardware, not the complete mounting column or spare wheel |
The factory TR-1/TR-2 installation instructions specify 15- and 16-inch travel-trailer tires and specifically exclude Class C motorhome tires. Confirm the original wheel bolt positions and the RV manufacturer's bumper-loading limits; a four-inch bumper measurement alone does not establish that it is strong enough to carry the spare.
Find the factory carrier components
The numbered list below follows the original carrier installation hardware, separating the bumper mounting parts from the wheel-retention parts. These components describe the complete TR-1/TR-2 carrier assembly; they are not a statement that every item comes in the separate 1TR-A hardware bag.
14-inch square trailer bumper
The vehicle structure the carrier wraps around; not supplied with the carrier.
2Carrier column and bumper plate
Supports the spare wheel and provides holes for the U-bolts.
3Two ⅜-inch U-bolts
Wrap around the bumper to fasten the carrier plate.
4Four ⅜-inch nuts and washers
Secure the two U-bolts to the carrier plate.
5Wheel attachment bolts and clips
Hold the two wheel-mount bolts in position on the carrier.
6Wheel lug nuts and flat plate
Hold the spare wheel against the carrier mounting arrangement.
Simplified parts identification, not a to-scale installation drawing. Use Stromberg's original illustrated instructions for the actual fastener arrangement.
| Factory component | Quantity in complete carrier manual | What to inspect |
|---|---|---|
| Tire carrier assembly | 1 | Folding section (TR-2), bumper plate, hinge/pin and overall condition |
| ⅜-inch U-bolts | 2 | Fits and reaches around the bumper and carrier plate |
| ⅜-inch nuts | 4 | Threads are undamaged and can secure both U-bolts |
| ⅜-inch washers | 4 | Used with nuts according to the complete carrier assembly instructions |
| ½-inch wheel-mount bolts | 2 | Correct mounting positions for wheel attachment |
| Bolt clips | 2 | Secure the wheel-mount bolts in the carrier |
| ½-inch lug nuts | 2 | Secure the spare wheel with the original mounting arrangement |
| Flat black retaining plate | 1 | Secures the wheel at the centre mounting position |
Choosing the 1TR-A replacement hardware bag
1TR-A is Stromberg's separately listed attachment-hardware option for both TR-1 and TR-2. The UsedRVParts listing identifies U-bolts and nuts in this package. It does not list washers as included. If you also need wheel bolts, bolt clips, the flat retaining plate or other hardware, compare what is missing against the original installation instructions before selecting the replacement.
Matching product photographs
View TR-2 product1TR-A replacement tire-carrier attachment hardware
View 1TR-A productBefore fitting or using a spare carrier
- Check whether your RV has an appropriate 4-inch-square, structurally rated bumper; inspect its attachments and condition.
- Confirm spare wheel dimensions, wheel mounting holes, and the complete carrier's intended trailer application.
- Check that the spare does not block lights, the licence plate, a storage hatch or another exterior fitting.
- Follow the manufacturer's U-bolt and wheel retention sequence, then inspect all hardware before each journey.
- On the TR-2, verify that the folding mechanism locks securely in the travel position and has clearance when folded down.
Factory installation and replacement reference
See Stromberg's TR-1/TR-2 assembly instructions (PDF) for the exact hardware quantities and mounting sequence, and the manufacturer's tire-carrier and service-parts listing for TR-1, TR-2, 1TR-A, 2200 and 8150-TC. The 2026 product catalog, printed page 18 also shows the two carrier styles.
For a bicycle carrier mounted on an RV bumper rather than a spare tire, use the separate Stromberg bumper bike-rack guide. The mounting parts and permitted loads are different.
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