Bike-Guard's Rocklock 1300 Combo U-lock and cable boasts a 13mm-thick steel shackle and a high-security crossbar with an anti-drill, anti-pull/pry reinforced lock cylinder for serious peace of mind. Plus, you get a Bike-Guard 6-foot-long, 10mm-thick cut-resistant stainless-steel cable that can be used to secure your front wheel when locking your bike with the Rocklock. Bike-Guard backs this lock up with a $500 anti-theft protection plan, too.
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The product is quite heavy and I don't carry it while ride, on the bike or otherwise, but it is great to have and I use it when travelling downtown to ride the [...] and then celebrate a good ride!