Abus Granit XPlus 54 Mini U-Lock - 13mm Thick High Security Bike Lock with Key (108x150mm, 4.3''x5.9'') - Black | Perfect for Urban Cycling, Commuting & Bicycle Theft Protection

Did a lot of research and comparisons with other top lock brands like Kryptonite and in the end this one suited my needs the best. Came down to this and the Kryptonite NEW YORK FAHGETTABOUDIT MINI for me. I wanted something light and small that I could easily carry around in my backpack without compromising on security. The Abus is half the weight of the Fahgettaboudit but a bit more length to it which is what I wanted. Really like the build of it, feels solid and light at the same time. Like having one of the keys with the LED light which is handy in the dark. First few weeks with it have been great and barely notice the weight when carrying it around and my bike hasn't been stolen so that's a plus! Definitely looks like a lock most thieves would pass on and if you make it snug against the frame, wheel and grounded post it's probably not worth their risk with a grinder.