RAINCORE Light Weight Bike Cable Lock for Heavy Duti Anti Theft - 59inch (150cm) - 0.4lb (184g) - Bike Chain Lock with Chain Cutter Proof Fiber - Patented Korea - Security Cable (59 incehs)

I use this in downtown, it’s portable, no need for a key, and it’s easy to put through the frame. Also long enough to adapt to whatever you lock it to https://a.co/d/07IkTBiz Edit: I use it to lock to an indoor bike rack at my gym, and have locked it to a street sign outside a lunch spot and grocery stores/cafes. I would not use this to lock it overnight. I also could lock it to a tree