Best Underbody Spare Tire Mount Solutions for Trailers and Boats
Finding the right underbody spare tire mount can maximize space, improve aerodynamics, and keep tires secure on trailers, boats, and RVs. This guide reviews five dependable options, highlighting mounting style, lug compatibility, load ratings, and corrosion resistance. Each option is suitable for common 4-, 5-, and 6-lug wheels and offers varying installation approaches—from under-frame retractable designs to side-mount brackets. Use the buying guide below to compare fit, durability, and installation complexity for your setup.
| Product | Brand | Fit Notes | Approx. Load |
|---|---|---|---|
| Extreme Max 5001.5967 Under-Frame Retractable Spare Tire Carrier | Extreme Max | Frame widths 52″–72″; under-frame mount | Up to 40–50 lbs typical small-to-medium tires |
| GADFISH Spare Tire Carrier | GADFISH | 4–6 lug patterns; up to 150 lbs | Max 150 lbs |
| GADFISH Stainless Steel Spare Tire Carrier | GADFISH | 4–6 lug patterns; stainless steel | Max 120 lbs |
| Qualward Spare Tire Mount Bracket for Trailer | Qualward | 4–6 lug patterns; powder coated | Up to 150 lbs |
| Gelacie Heavy Duty Spare Tire Carrier | Gelacie | Up to 40″ tires; sturdy steel | Up to 40″ wheels |
Extreme Max Under-Frame Retractable Carrier
The Extreme Max 5001.5967 provides an adjustable telescoping design to accommodate frame widths from 52″ to 72″. It mounts under the frame to conserve exterior space, delivering a cleaner trailer profile and better aesthetics. A durable powder coat finish enhances rust resistance for outdoor use and long-lasting performance. This option is well-suited for trailers and RVs that require a retractable solution without adding height above the chassis.
GADFISH Spare Tire Carrier
This heavy-duty bracket from GADFISH emphasizes robust construction with an upgraded triangular frame and a reinforced back plate, enabling a holding capacity up to 150 lbs. It supports 4-, 5-, and 6-lug patterns across common bolt diameters and is designed for trailers and boat trailers, delivering reliable tire security in demanding environments. Its design minimizes tire movement and reduces wear during travel, helping to prevent loosening of fasteners.
GADFISH Stainless Steel Spare Tire Carrier
The stainless version from GADFISH adds rust resistance and a robust triangular welded structure, suitable for harsher environments. It supports up to 120 lbs and is compatible with 4-, 5-, and 6-lug wheels. Its surface treatment and reinforced backing plate help keep the tire secure and aligned, even on rough terrain or splash-prone installations, making it a solid choice for marine trailers and rugged roads.
Qualward Spare Tire Mount Bracket
Qualward offers a powder-coated, heavy-duty bracket designed to handle 4-, 5-, and 6-lug wheels with bolt patterns up to 5.5 inches. It supports trailer tongues up to about 4 inches wide and up to 5 inches tall, providing a versatile mounting option that balances ease of installation with substantial load capacity. The design emphasizes corrosion resistance and long service life in mixed weather conditions.
Gelacie Heavy Duty Spare Tire Carrier
The Gelacie spare tire carrier is designed for heavier fleets and off-road use, supporting larger wheel sizes up to 40 inches. It uses a three-section structure to space the tire farther from the vehicle body, which can improve ground clearance and reduce bumper contact. Built from durable steel with a black powder-coated finish, it is aimed at vehicles that routinely carry oversized tires or require extra clearance for lift setups.
Buying Guide: Key Purchase Considerations
- Weight rating and tire size compatibility: Confirm the maximum load rating and ensure the mounting pattern matches your wheels (4-, 5-, or 6-lug). If you plan to carry oversized tires, look for higher weight capacities and space accommodations (such as Gelacie’s 40-inch compatibility).
- Mounting style: Under-frame retractable systems conserve exterior space, while side-mount brackets can simplify installation and servicing. Consider whether you need a fast-access retractable option for frequent tire changes.
- Durability and finish: Powder coating and stainless steel builds offer improved rust and corrosion resistance, especially for trailers exposed to water, salt air, or frequent rain.
- Ease of installation: Some brackets require drilling or alignment with trailer frames; others are bolt-on. Review compatibility with your trailer tongue width and frame construction before buying.
- Vibration and security: Look for reinforced backing plates and triangular structural designs to minimize tire movement, reduce noise, and prevent loosening during travel.
- Maintenance considerations: Stainless steel models resist rust but may come at a higher upfront cost. Powder-coated options balance price and protection; verify warranty terms if available.
- Multi-use practicality: Some designs are well-suited for boat trailers and RVs, while others excel on utility trailers. Assess your vehicle type to ensure universal compatibility or vehicle-specific fit.
Each featured product offers a distinct approach to securing a spare tire under or beside the trailer. By aligning your vehicle type, wheel lug pattern, and space constraints with a suitable mounting solution, you can achieve a secure, durable, and accessible spare tire setup for American roadways and waterways.