Another vote for a Kryptonite disc lock. I think mine's an "EV"
When it was revealed that the round keys were found to be less than secure, I contacted Kryptonite and they sent me a new lock with flat keys.
Mine sites out in all wethers and has always locked/unlocked without problem. I like the fact that you need the key to lock it. It will also work with a cable or chain as well as just on a disc.
Standard warning for disc-locks. Figure out a way of warning yourself that it is fitted. I have a length of yellow string that I run from the lock to the throttle. Also, fit the lock then roll the bike until the lock is against the fork. This stops you riding 6 ft before the lock stops you and you fall off.
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