Spare Tire Locks

What Are Spare Tire Locks?

A spare tire is one of the most overlooked yet valuable components on any truck, SUV, trailer, or RV — and unfortunately, that makes it a prime target for thieves. Spare tire locks are dedicated security devices designed to prevent unauthorized removal of your spare, whether it's mounted under a truck bed, on a rear carrier, or strapped to a trailer. Unlike standard lug nuts, these locks use keyed or keyless mechanisms that make it extremely difficult for opportunistic thieves to walk away with your spare in a matter of seconds.

Why Spare Tire Security Matters

Spare tire theft is a growing problem. The Spare Shield and other manufacturers in this space have responded to a nationwide rise in spare tire thefts — incidents that can leave owners stranded roadside or facing costly replacement bills. A full-size spare on a modern truck or SUV can easily cost several hundred dollars or more to replace, making a spare tire lock one of the most cost-effective security investments a vehicle owner can make.

Undermount spare tires — the kind found slung beneath the bed of most pickup trucks — are especially vulnerable. The winch cable that holds the tire in place can be quickly accessed from underneath the vehicle, and without protection, a thief with basic tools can drop and remove the spare in under a minute. Spare tire locks address this vulnerability directly by blocking access to the lowering mechanism or securing the wheel itself so it cannot be removed without the correct key or tool.

Types of Spare Tire Locks

• Cable access locks: These block the winch tube or cable opening on undermount spare setups, preventing a thief from inserting the lowering tool and dropping the tire.
• Lug nut-style locks: These replace one or more standard lug nuts with a specially keyed locking nut that requires a unique socket to remove — great for rear-mounted or trailer spares.
• Shackle and bracket locks: Heavy-duty devices that physically clamp onto the rim, making removal impossible without the key.
• Keyless locks: Some designs use a combination or tool-free mechanism for fast owner access while still deterring theft.

What to Look For When Shopping

Compatibility is the most important consideration. Most spare tire locks are designed for specific vehicle types, lug patterns, or mounting styles, so it's critical to verify that any lock you choose matches your vehicle's make, model, and spare tire configuration. Beyond fit, look for locks constructed from corrosion-resistant materials such as stainless steel or powder-coated alloy steel — especially if the spare is exposed to road grime, rain, or salt. Ease of use matters too: the best locks install quickly without special tools and can be operated just as fast in an emergency when you actually need the spare.

Top Brands in Spare Tire Locks

The Spare Shield is a category-defining brand purpose-built around the specific problem of undermount spare tire theft. Their patented design targets the steel cable — the most vulnerable point of an undermount system — and covers it so thieves can't access or cut it. The Spare Shield is proudly made in the USA and comes with everything needed for installation right at home.