Blind spot mirrors are one of those cheap upgrades that can make a real difference in daily driving, but they’re also easy to get wrong. The Puzzle Sl 2-Inch Circle Mirror set is a pair of small, convex mirrors designed to stick onto your existing side mirrors. At 50.8mm (2 inches) in diameter, they’re on the smaller end of the aftermarket blind spot mirror spectrum. This review looks at what they offer, where they fall short, and whether they’re worth considering for your vehicle.
These mirrors are intended to be attached to the lower or outer corner of your side mirrors. The idea is that the convex shape widens your field of view, letting you see vehicles that would otherwise be hidden in the blind spot. Installation is straightforward: each mirror has a self-adhesive backing that peels and sticks. There’s no wiring, no tools required beyond a clean cloth to prep the surface. Most people can have them on in under five minutes. That simplicity is a big part of their appeal.
In real-world use, the 2-inch size is a trade-off. On a compact car, they can be positioned to show a useful slice of the adjacent lane without blocking too much of the main mirror. On a larger truck or SUV, however, the small diameter means the reflected image is quite tiny. You can see that something is there, but judging distance and speed takes more effort than with a larger mirror. For spotting a car in the next lane before a lane change, they do the job. For detailed observation, they’re limited.
The convex curvature is strong, which is typical for this type of product. That means objects appear smaller and farther away than they actually are. It’s a known characteristic of convex mirrors, but it’s worth repeating because it can catch new users off guard. You’ll need to recalibrate your sense of distance when using them. Some drivers adapt quickly; others find the distortion annoying and stop using them altogether.
Build quality is acceptable for the price point. The mirror surface is glass, not plastic, which is a plus for clarity. The adhesive is the weak link. In hot climates or areas with extreme temperature swings, stick-on mirrors can loosen over time. A few users report having to reattach them with aftermarket tape. That’s not unique to this brand—it’s a common issue with adhesive-mounted accessories. If you live where summers are scorching, expect to keep an eye on them.
Compared to alternative approaches, these mirrors occupy a specific niche. Larger rectangular blind spot mirrors, often 3 to 4 inches wide, provide a bigger image but take up more space on the host mirror. They can obscure more of your existing view. Adjustable blind spot mirrors with a swivel base let you fine-tune the angle after installation, while the Puzzle Sl set is fixed once adhered. On the other hand, fixed mirrors are less likely to vibrate out of position. It’s a trade-off between adjustability and stability.
Another alternative is a full mirror replacement with integrated convex sections. Those cost significantly more and require more installation effort, but they offer a cleaner look and often better optical quality. The Puzzle Sl mirrors are a budget-friendly add-on, not a replacement for a properly adjusted main mirror. They’re meant to supplement, not substitute.
So who are these for? They’re best suited to drivers of smaller vehicles—sedans, hatchbacks, maybe a small crossover—who want a quick, inexpensive way to reduce blind spot anxiety. They’re also fine for anyone who occasionally tows a small trailer and wants a bit more rearward visibility without investing in tow mirrors. They are not ideal for large trucks, vans, or SUVs where the small size limits their usefulness. Nor are they for drivers who demand precise distance judgment from their mirrors; the convex distortion makes that difficult.
If you’re considering these, keep your expectations modest. They won’t eliminate blind spots entirely, and they won’t match the performance of a well-designed factory convex mirror. But for a few dollars, they add a useful extra angle that can help in tight traffic. Just be prepared to clean your mirror surface thoroughly before sticking them on, and check them periodically for looseness. As a low-cost driving aid, they’re reasonable—not remarkable, but not a waste either.
