As my GSA has underseat stowage provsion for a U-lock, I though I might as well use it. So I'm looking for any recommendations for such a beastie that will fit in the aforementioned stowage space?
Offhand can't remember the model that fits but it us an Abus lock and it not only fits under the seat but will got through the center of the rear axle and the spokes of the rear wheel as well.
I guess if you search for Abus D Lock on here you might find it