If you're gonna ride in a metropolitan area, you're gonna need a U-lock. Ditch the cable lock and invest in a good one. Kryptonite Locks have had a bit of a spotty history, but the protection afforded by their New York "Fahgeddaboutit" locks has stood the test of time — so does the $4,500 warranty attached to them. Sure, one will set you back about $100, but that's much less than the cost of having to cop a replacement bike.