Theft prevention that actually works (ranked by evidence, not vibes)

We're an insurance project telling you how to not need us. That's intentional: theft claims are miserable for everyone, and most stolen bikes were secured in a way that took a thief under 30 seconds to defeat. Here's what the evidence says actually moves the odds.

1. The lock hierarchy

Locks are rated — Sold Secure (Bronze/Silver/Gold/Diamond) and ART (1–5 stars) are the two independent schemes. Cable locks, including thick ones, are cut silently in seconds and should be treated as decoration. The realistic floor for street parking is a Sold Secure Gold U-lock or chain; for e-bikes and $3,000+ bikes, Diamond/ART 3+.

• U-locks: best security-per-dollar and per-pound. Smaller shackle = less leverage room for tools.
• Chains: heavier, but the only good option for oddly shaped racks and cargo bikes. Hardened links 10 mm+.
• Folding locks: convenient, mid-tier security — fine for cafés, not overnight.
• Cables: use only as a supplement to loop through wheels and saddle, never as the primary.

2. The two-lock rule and locking technique

Two different lock types (a U-lock plus a chain) force a thief to carry two different tools. Lock the frame AND rear wheel to the rack through the rear triangle, fill the shackle (less room for a jack), keep the lock off the ground, and take the front wheel's quick-release or use locking skewers.

3. Location beats hardware

The same bike with the same lock has wildly different odds depending on where it stands. Thieves work where they can loiter: quiet side streets, parking garages after hours, apartment bike rooms with tailgate access. Busy, camera-covered, well-lit racks are consistently the safest public option — and indoor storage at home ends most theft risk entirely. Overnight outside is where bikes go to disappear, regardless of the lock.

4. Registration and serial numbers — the 5-minute insurance

Register the serial number (under the bottom bracket) with a national registry like Bike Index or Project 529 — it's free, and it's how recovered bikes actually get returned instead of auctioned. Photograph the serial, your components, and yourself with the bike. For any insurance claim, this documentation is the difference between a smooth payout and a proof-of-ownership fight.

Use the bike registration checklist

5. Trackers help recovery, not prevention

GPS and Bluetooth trackers don't stop a theft — they occasionally un-steal a bike, and the details matter (which network, where it's hidden, what you do when the dot moves). We wrote up the honest comparison separately.

AirTags vs. dedicated GPS trackers