I have seen a lot of motorcycle disk locks out there. The only problem with a lot of them is that they are very bulk or expensive.
I have found an alternative to a the commercially sold disk locks. What I am now using is a Master Lock Round Pad Lock variant. I happen to have a UHAUL version that I bought when we were moving so this is what I am using on the front disk of My DR-Z400S. It is a perfect fit as can be seen in the photos, and it is much harder to get a pair of bolt cutter in to cut it. The other thing that I like about this lock is that the size and shape in nice and smooth, so putting it in a pack or bag on the bike is easy.
If you are in need of a lock for your bike this one works nice and can be had for around $10 or less.
Dave

















