1x7 drivetrain

a 7 speed chain should last as long as any other in terms of stretch.

where it may outlast a modern chain is breakage where by the pin and the outer plate part company. as the 7 speed as more pin on the outside of the plate than a 10-12 speed does it allows for a bit more movement before it fails.

material tech has moved on somewhat but the wear is still metal on metal so you can expect a similar wear pattern between chains.
 

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