The Kryptonite Keeper 785 chain is an interesting choice for a bike. Its resistance is important against attacks, without penalizing its practicality too much. This lock is pleasant to use on a daily basis.
Alternatively
The Btwin U 900 lock from Decathlon keeps its promises of being a robust model. Admittedly, this is paid for by a certain overweight, but the U 900 remains quite practical. It may not be suitable for very large frames, but for its price, hard to find better.
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