I use the Abus granit sledg 77, it can be purchased with a support clip that allows for secure attachment to pillion pegs (or elsewhere). This means that you can lock the rear wheel as opposed to the front. Cheers Grant
I got my bikelok fitted by @Billy Big Roy today. Honestly, if you are thinking of getting one of these just get it from him. Total legend. Made me a cup of coffee and explained all the bits and bobs you get with it to fit various bikes. After fitting it (I’m glad I got him to do it as I’m a bit of a bodger and he did it properly with a torque wrench) he made sure I could use the lock. Really appreciated it.
It was my pleasure and I thank you for your purchase and coming to collect. I only wish the weather had been better for you, but hopefully the rain held off on the way home.