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when i'm a low risk area (small town groceries and such) I use pic related ("z lok combo" around 20$) Will take 3 seconds for someone with a bolt cutter to steal the bike but it's good for what it is. I have two. One for my helmet or bag secure to metal frame or my bike.
The other one is on my back wheel. 2 months ago I've stopped for a quick bathroom break and a drink and notice my bike was not in the same position and noticed a small scratch on the lock and some red/brown liquid near the bike rack. Return inside and ask the owner if they got cameras and we rewind a few minutes and saw a guy take my bike and try to run. Stopped by the lock, fell and scratch it's face and arm on the asphalt. He was pouring blood.
The owner save the vids and still laugh and talk about it every time he see me.