It’s not even old old bikes, we’ve had a few friends’ late 90s MTBs to look at because ‘the gears are funny’* or ‘my pedals are loose’**.
* 3 x 8 and everything, and I mean everything, was worn out. They’d been on from new in the late 90s. Front didn’t shift or when it did the chain either dropped off the front or the back and the rear was all over the shop. The fella had ‘had a go’ himself.
** Loose ball BB was knackered. Aaaaaargh! Boil the kettle. Get the blowtorch on it. Clamp it in the vice. Swear, lots. Get the cups out. What should be grease is rusty water…
But, it’s hard to say no to friends and explaining that it’s cheaper to buy a new/good used bike than refurb a properly worn out and knackered old one is tricky.