ChainKASE X-TREME Ebike Chain Lock – 8mm Hardened Steel, 4'

A heavy-duty 4-foot chain lock for locking your ebike to just about anything. The 8mm titanium-enforced hexagonal hardened-steel chain resists bolt cutters, while the integrated lock uses the same attack-resistant cylinder as our UKASE MAX. The flexible chain gives you more locking options than a rigid U-lock.

• 4-foot 8mm titanium-enforced hexagonal hardened-steel chain
• Z-Key cylinder with BumpBlok technology resists picking, pulling, and drilling
• Water- and heat-resistant chain cover protects your frame and the chain
• Automatic dust cover keeps the cylinder clean
• Includes 3 laser-cut keys

Prefer a rigid U-lock? See the UKASE MAX shackle lock or the UKASE MAX with cable. Want most of this reach in something that packs down small? The folding Link Lock opens to 34" and weighs 2 lbs.

Need more than four feet? The ChainKASE 7' combination lock runs the same 8mm hardened chain at nearly double the length, which is what you want for chaining two or three bikes together. Two differences worth knowing before you jump to it: it costs $20 more, and it uses a 4-dial combination rather than this lock's anti-pick Z-Key cylinder. If you are buying for the cylinder, stay here.

The trade with a chain is weight and bulk: it does not clip neatly to a frame, so it lives in a bag or over your shoulder. Our ebike lock buying guide walks through when that trade is worth making and when a lighter lock is the better buy.