The hub on the mower is built slightly different to accept the chains. I'm not entirely sure how the US mowers have the hub made though.
Last picture is from my mower. Roughly 170 hours of brush mowing, along with hitting loads and loads of rocks, hidden pipes, scrap and whatever.
The last link was cracked at the time and it actually broke on that one job. The broken pieces fell right where it broke. Now I'll either cut a link on the good chain to balance things out again or just buy a new set of chains, that's like €20 or €30. Not a big expense considering what the previous chains have dealt.
EDIT: This is not a redneck mod we do to our mowers. They are sold from factory with chains and everything is compliant with all the European safety standards. In fact, blades are offered as an option.
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