OnGuard RockSolid 8590

It ranks #3 (A tier) on our consolidated bike locks board, drawn from 3 cited sources across 2 outlets.

The OnGuard RockSolid 8590 is for the rider who wants a high-security U-lock whose resistance has been shown on camera. Reviewers tested it on video against common attack methods and it held up, which earns it A tier and third place on our board. If you want the best value on the board, the Litelok X1 in S tier costs less for most of the security. If grinder resistance is the whole question, the OnGuard RockSolid ranks one place higher for that.

Well, on the evidence of video testing. Reviewers describe strong resistance to the common attacks a street thief uses, robust construction and a high security rating. The board does not record a specific time-to-cut for this model, so treat it as a high-security lock that buys time rather than one that cannot be beaten. Nothing on our board is grinder-proof.

Buy the Litelok X1 if value is the deciding factor. It is the only S tier lock on our board and reviewers rate it the best performance for its price. Buy the OnGuard RockSolid 8590 if you want the heavier-duty build and the reassurance of seeing it tested on video. Both are sound choices and either beats everything from C tier down.

Reviewers call it portable, which is unusual for a lock with this much steel. It is still a U-lock, so plan on a frame mount or a bag rather than a pocket. If you need something that folds, none of the A tier locks do, and you would be trading security for convenience.

Lubricate the cylinder with a dry PTFE or graphite product before the wet season and again mid-winter. Store the lock keyway down so water drains rather than freezing inside. If the key turns stiffly, warm the lock and relubricate rather than forcing it, since a snapped key is the most common winter failure on any U-lock.