Rattan Security Folding Bike Lock – Keyed, Portable

The best bike lock is the one you actually have with you. Most riders buy a heavy chain, carry it twice, and leave it in the garage after that.

This one folds flat, straps to the frame, and weighs about as much as a full water bottle. It rides with the bike instead of staying home. It's keyed rather than combination, so there's no code to forget at the end of a long ride.

At a Glance

What it's built for

• Errands and short stops. The kind of parking where the bike is out of sight for ten minutes, not ten hours.
• Frame plus anchor. 77 cm is enough to take in the frame and a standard rack post or signpost. On a fat-tire bike with a thick post, expect frame-only.
• Riding with it attached. The strap mount keeps it flat against the frame instead of swinging off a rack.
• People who hate codes. Two keys, a case holder, done.

The Honest Part

No lock is uncuttable, and we're not going to tell you this one is. A folding steel lock in this class is built to defeat opportunity — the person walking a row of racks with hand tools looking for the easy one. Someone who shows up with a cordless angle grinder will get through this lock, and through nearly every consumer lock sold at any price. Locks buy time and make your bike the harder target. That's the job.

Use it accordingly. Lock through the frame and something immovable, park where there's foot traffic, and don't leave a $2,000 e-bike on a lock alone overnight. For long or unattended storage, this is a second lock, not the only one.

It's keyed, which cuts both ways. Nothing to memorize, but if you lose every key you're cutting the lock off. Keep the spare somewhere other than the bag on the bike.

Weight and dimensions above are the manufacturer's published figures. We list them as given rather than rounding them into something that sounds better.

Questions we actually get

Will it reach around a bike rack and my frame?
Usually yes. 77 cm of open circumference takes in a standard rack tube or signpost plus the downtube or seat tube. Around a very thick post, or a fat-tire frame with wide tubing, it gets tight — plan on securing the frame to the anchor rather than the frame and a wheel.

Can I lock a wheel with it?
On a standard frame, often. On a 4-inch fat tire, rarely — the tire itself eats the reach. If wheel theft is your concern, pair this with a cable loop through the wheels.

Does it fit any bike, or only Rattan?
Any bike. The mount is a strap, not a bracket, so it attaches to round or square tubing on most frames.

Will the straps rattle?
Only if they're loose. Tighten until the lock body sits flush against the tube; if it can move by hand, it will buzz over rough pavement.

What if I lose the keys?
Contact us and we'll help you source replacements from Rattan where possible, but plan on the lock being cut off if all keys are gone. Register the key number on the tag when you unbox it.