On Guard Bulldog LS U-Lock
On Guard locks are tough, but gentle on your power sport finish. They've placed plastic, rubber or vinyl wherever the power sport can rub. With massive hardened ultra steel shackle and ALL TUBE multi-position quick release mounting bracket, the legendary M-cylinder mechanism is the major deterrent to theft. Anti-drill and pick-proof guts make for a super secure package and the Dual Steel Bar locking mechanism deliver up to 10 tons of pull strength. Ballistic plastic holds up to the most aggressive trashing and thrashing guaranteed and On Guard locks have integrated water covers to protect the cylinder.
Included are 4 laser cut keys and 1 light key for night-time use with all M-key locks.
I like this lock. It's extra long so you can get 2 bikes locked to a sign post pretty easily. Comes with several keys (one has a light) and a mounting bracket so you can clip it to your bike and not have to carry it in a pack or in your jersey. It also comes with loss insurance (just go online and complete the form). Seems super strong and durable. Can't beat the price.