Spare Tire Locks
Why Spare Tire Locks Matter for RV and Trailer Owners
When you're towing a boat trailer, hauling with an RV, or heading out on a long-haul adventure, your spare tire is one of the most critical pieces of emergency equipment you carry. It's also one of the easiest targets for opportunistic thieves. Spare tire locks are purpose-built security devices designed to prevent unauthorized removal of a mounted spare tire — giving you peace of mind whether your rig is parked at a campsite, a marina, or in your driveway.
Spare tire theft is a growing problem. Spare tire theft is dramatically increasing both nationally and internationally, and spare tires are easily removed — many popular vehicles possess a full-size spare, making it a high-value target. Victims can be left with a replacement cost exceeding $700 or, even worse, stranded roadside without a spare. For RV owners and trailer enthusiasts, the stakes are just as high.
How Spare Tire Locks Work
Spare tire locks come in several designs, each targeting a different mounting style. The most common types include lug-nut locks, cable-based systems, and full-coverage shields. A metal-construction lug-style lock is designed to go right over your current lug nuts and secure the tire in place. Cable-based systems thread through the wheel rim and secure to the trailer frame, while shield-style devices cover the most vulnerable point of an undermount spare — the retaining cable itself.
Most spare tire locks are designed to be versatile, fitting a wide range of vehicles including cars and motorhomes. It's important to check compatibility with your specific vehicle model to ensure a perfect fit and optimal security. Thread pitch, lug pattern, and wheel size all factor into finding the right match, so always verify fitment before purchasing.
What to Look for When Shopping Spare Tire Locks
- Material and durability: Look for hardened steel or stainless steel construction that resists cutting, corrosion, and weathering — especially important for marine and outdoor trailering environments.
- Lug compatibility: Common thread sizes like 1/2"-20 cover most trailer and RV applications, but always confirm your wheel stud size.
- Key vs. keyless: Keyed locks offer more robust security; keyless or combination options provide convenience when keys are easily misplaced on a trip.
- Ease of installation: The best locks install in minutes without special tools, so you're not fumbling at the roadside when you need that spare in a hurry.
- Weatherproofing: Seals, O-rings, and dust caps help protect the locking mechanism from road grime, salt water spray, and moisture — critical for boat trailer and RV use.
Spare tire locks are a cost-effective way to protect your spare tire, which can be an expensive item to replace. By investing in a lock, you safeguard your tire against theft, ultimately saving money and hassle in the long run.
Top Brands in Spare Tire Locks
When it comes to dedicated spare tire security, The Spare Shield stands out as a specialist in the category. The Spare Shield utilizes a unique system to protect the most vulnerable part of an undermount spare tire — the steel cable holding it in place — and is engineered to be easy for the owner to install while being nearly impossible for a thief to remove. Originally introduced in 2012, the brand had successfully sold more than 20,000 units , demonstrating its proven track record among RV and trailer owners. Automotive Security Group backs their products with a limited warranty against defects, and The Spare Shield is proudly made in the USA.