Kryptonite New York Standard Bike U-Lock, Heavy Duty Anti-Theft, 16mm Shackle with Mounting Bracket and Keys, Ultimate Security…

For riders parking in genuinely high-risk areas, the reviewers we read repeatedly point to the Kryptonite New York Standard. OutdoorGearLab's testing found its 16mm shackle virtually impervious to hand tools, cordless drills and even car jacks, with only the angle grinder making quick work of it. That maximum-security positioning, plus Kryptonite's anti-theft protection coverage noted by the New York Times' product testing (nytimes.com), is why it shows up as the go-to for urban theft hotspots.

The trade-off is weight and bulk, which dominates community feedback. r/bicycling and r/BikeLA threads describe it as feeling heavier than the bike it protects and awkward to mount, with one rider noting there are few attachment options because the body is so thick. A minority r/bicycling poster argued the whole Kryptonite series is overrated and preferred Abus Granit, but that view runs against the broader high-trust consensus here.

The synthesis: this is a deterrent-first lock for people who'd rather carry extra weight than lose the bike. It's not a lightweight commuter choice, and it still falls to a grinder, but among portable locks reviewers treat it as near the top for conventional-attack resistance.