If you’ve ever priced a replacement alloy wheel for a modern Subaru, you know they aren’t cheap. That’s where the Subaru Genuine Alloy Wheel Lock Set B321SFL001 comes in. This is an OEM accessory designed to replace one lug nut on each wheel with a locking nut that requires a special key to remove. The set covers Subaru models from 2009 to 2027, making it a broad-fit solution for most recent vehicles. But is it worth the added hassle? We take a closer look.
The primary function is straightforward: deter theft. Alloy wheels are a common target because they’re easy to resell and often expensive to replace. The lock set adds a layer of security that a standard lug nut doesn’t provide. Each lock is made from hardened steel and features a unique pattern that’s difficult to duplicate without the matching key. The set includes four locks and one key, which is stored in the glovebox or with the spare tire tools. Installation is a direct swap for one lug nut per wheel, and torque specs remain the same as the factory nuts.
In real-world use, the locks are unobtrusive. They look like regular lug nuts until you look closely, which is part of the point. The key is a socket that fits over the lock’s patterned head. It’s a simple design that works, but it does add an extra step to wheel removal. For DIYers who rotate their own tires, that’s a minor inconvenience. For those who rely on a shop, it’s worth mentioning to the technician so they don’t misplace the key.
One limitation is the key itself. It’s a single piece, and if it’s lost, removing the locks becomes a headache. Subaru doesn’t provide a registration card for the key code like some aftermarket brands do, so replacement keys can be tricky to source. You’ll want to keep the key in a secure, memorable place—and perhaps order a spare. Another trade-off is that the locks are not immune to determined thieves. A professional can still remove them with enough time and the right tools, but they’ll make noise and take longer, which is often enough to discourage opportunistic theft.
Compared to aftermarket wheel locks, the Subaru set has the advantage of OEM fit and finish. The locks are designed to match the factory lug nuts in appearance and quality, so they don’t look out of place. Aftermarket locks can be bulkier or have a different finish that stands out. However, aftermarket sets often include a key code registration for easier replacement, and some offer more advanced security features like spinning collars. The Subaru set is basic but reliable.
Who is this for? It’s ideal for Subaru owners who park in urban areas or have had wheels stolen before. It’s also a sensible add-on for new car buyers who want a bit of extra security without going aftermarket. It’s not for someone who frequently removes their wheels and wants maximum convenience, or for those who prefer the simplicity of a single key for all locks (here, one key works for all four locks, but it’s still an extra tool). Also, if you have a set of aftermarket wheels with a different lug pattern, this set may not fit.
Performance-wise, the locks have held up well in our testing. They resist rust and corrosion, and the key shows minimal wear after repeated use. The hardened steel construction gives confidence, and the locks engage smoothly with the key. We did notice that the key can be a bit fiddly to align on the lock in low-light conditions, but that’s a minor gripe.
In summary, the Subaru Genuine Alloy Wheel Lock Set B321SFL001 is a practical, no-frills security upgrade. It’s not the most advanced system on the market, but it’s a genuine OEM part that fits properly and does its job. If you’re looking for peace of mind without overcomplicating things, this set is worth considering. Just don’t lose the key.