I use on my commuter bike a Kryptonite Faggetaboutit and a cable. It's pretty hefty lock but it feels like nothing because I store it in the rear rack when I'm cycling. My mtn bike uses an Abus Bordo Granit x-plus folding lock and a cable for the front wheel. It stays in the carrying pouch attached to the bottle cage bolts on the frame. I don't notice it when riding either.