OnGuard Brute STD

Bottom line

If you need a tough U-lock for your bike, the OnGuard Brute STD definitely fits the bill. However, an unwieldy size and an unsuitable bracket seriously hinder its usability.

Ease of use

Secure but unwieldy. Several reviewers describe the OnGuard Brute STD as a "beast." This is a big, tough U-lock, and although it provides excellent security, its size makes it difficult to use. The Brute STD has a long shackle, so it's a good choice for beefy bike frames or for securing both the frame and rear wheel. However, users say the large size makes it a challenge to carry, and the included mounting bracket doesn't seem sturdy enough to support its 4.3-pound heft.

If you live in a low-crime area and want a lighter lock, the 2-pound OnGuard Bulldog Mini TC (Est. $30) is worth considering, but it doesn't perform as well in security tests.

Materials

Protective vinyl coating. With a hardened steel shackle measuring nearly 17 mm, this lock is very durable, owners report. A vinyl coating helps protect the bike frame from nicks and scratches, which reviewers say is a must since the mounting bracket isn't very sturdy.

Warranty & security

A tough lock with lots of anti-theft protection. Many top-rated U-locks are expensive, and the OnGuard Brute STD is no exception. It performs well in theft tests, taking top honors in one review at Maxim magazine and scoring very well in an older test at Slate.com. Editors can't saw through the 16.8 mm steel shackle, and the lock doesn't budge in a direct assault with a hammer. It does eventually succumb to an angle grinder, but most bike thieves don't carry power tools. The lock also comes with an anti-theft protection plan of $5,001, but it isn't available in New York.