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Both of these (the rim and the frame) are just a bit of oxidisation.
The rim looks pretty unworn but maybe a bit hard to tell from the angle the photo was taken at, if it feels concave then it's worn, if it's relatively flat then either just use the rims and be prepared to give the pads a scrub/sand after a week or so or give the rims a bit of a scrub with a scotch pad type thing to remove the oxidisation.
The frame is just a bit of the oxidisation under the lacquer layer. Nothing to worry about other than cosmetically.
Think they are still rideable
The only other thing that worries me is this one: is this only paint damage? Frame is alu.
Got this bike for free and want to upgrade it but obviously mtb’s are not my specialty.
I’d need some new types, chain and pedals and should be good to go.
Fork is a rockshocx that hasn’t seen service for ten years so it might be shot. Can I replace it with a cheap rigid fork? Any forum approved ones?