Trek's Streetwise U-Lock w/Cable utilizes a 13mm-diameter hardened-steel shackle and crossbar, plus a cable, which provides convenience, versatility and top-notch safety, too. By using two locking devices you can secure the frame to an immovable object with the U-Lock and lock the wheels with the cable (no need to remove the front wheel). Plus, the high-security disc-style U-Lock mechanism is pick-proof and comes with a protective dust cover. And, there's even a $1,000 anti-theft protection offer to back up this lock! What's more, it comes with a handy carrying bracket that ensures top security is always at hand.