Originally Posted by
patrickwise
You can consider Kryptonite Keeper chain bike locks. Based on my personal experience using the product, the Kryptonite Keeper looks formidable and offers many anti-theft features. The 7 mm four-sided chain links are made with 3T manganese steel, known for their high-impact strength and abrasion-resistance features. I like the heavy-duty chained covered by a thick black sleeve which protects the links from possible scratches.
We had a 12mm Kryptonite/Schlage chain in the shop and with two hits from a sledgehammer it was broken, we took an 8mm Abus chain and hit it for 20 minutes with the same sledgehammer and no damage aside from maybe a touch of scuffing. Not that it was scientific lab testing and it was just one and one but still the thinner chain outlasted a thicker chain.
The Keeper is a pretty low security chain and whenever I see one I don't think formidable. This is formidable:
https://mobil.abus.com/usa/on-road/L...4KS-Black-Loop. However it weighs like 16lbs so it is not super portable but it will keep that bike secure provided you are locking to something secure. However realistically if I was doing a chain it would be the City Chain 1010 but realistically I would just do a Bordo folding lock and have something easier to carry and also quite secure.