Kryptonite Evolution Folding
Made of 5.4mm thick hardened steel plates and coated with thick rubber, the Kryptonite Evolution 790 is Kryptonite's strongest folding lock.
So strong it qualifies for Kryptonite's best Anti Theft Protection insurance of $2,500 (available at Kryptonitelock.com).
Unfolds like origami to a larger than U-lock size and is as tough for thieves to get thru as Kryptonite U-locks.
Stores neatly on the bike in holster on your bike. Free installation of the bracket in-store.
If your bike has quick release wheels, consider a double ended cable for even greater security.