I am currently locking up a bike with the Kryptonite New York LS Bicycle U-Lock ( 4-Inch x 10.25-Inch) on the back wheel and the Keeper 880 Chain on the front. I have the Kryptonite New York Fahgettaboutit Mini Bicycle U-Lock (3.25 x 6-Inch), but I am not using it because after reading various places the general consensus is to use two different types of locks so that a thief would require more tools.
Recently I did some research into the security ratings of all my different locks and found out that the Keeper 880 has a rating of 6 while the Mini U-Lock has a rating of 12. What I am wondering is it advisable to start using the two U-Locks which means a thief would require less tools but would take more time. Or is it advisable to stay with the two different types of locks?
Side note: I won't buy another chain, they get to heavy after the keeper 880(8 pounds+). And on the same note I'm not going to cycle with all three(nearly 15 pounds). Ten pounds is plenty.