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enter image description here rusted chain and seized hub i found these two bikes by the dumpster- Dahon Boardwalk folding bikes. They are totally rusted by the salty air (it's a humid salty beach climate). The chain is rusted and when I push the pedal, the wheel does not move. The seat post is rusted. And the folding mechanisms are rusted.

I'd want them for a simple ride, 10mins into town and back- so might be worth it to fix. They don't have to be perfectly restored. What are the main things to evaluate before refurbishing a bike?

I'm willing to put down $150 on parts. I have basic tools and plenty of time.

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    Hard to say without a closer examination, but I've rehabbed bikes that were in worse condition. Even the chain might be salvageable by soaking with oxalic acid ("wood brightener"). The big question is the condition of the bearings. Feb 14 at 17:21
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    Do they work as is? Can you identify anything positively broken?
    – MaplePanda
    Feb 14 at 18:02
  • Also depends to what level you want them restored - coucors would cost much more than mere "working"
    – Criggie
    Feb 14 at 18:28
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    Looks like a fair amount of corrosion on handlebars and seatpost. A seized seat post can be a big problem. If you’ve got time and interest, it’s worth tearing them down completely and evaluating them, but hard to tell just from the photo whether you’ll have something usable when you’re done
    – Andrew
    Feb 14 at 19:07
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Based on the photos you might not need any parts at all.

The chain looks pretty awful, and is likely siezed up, but a good clean is required to see if it needs replacing. I've had some ugly chains that were perfectly functional.

Brake pads is a common age item too - they get hard with age and braking performance suffers. But pad replacements are cheap and easy.

Tyres and tubes can be affected by age, so inspect closely, and if they hold air pressure overnight you're probably good.

Grips can get tacky and feel awful, from UV. Replacements are cheap, or you can simply wrap them in tape temporarily.

Saddles age and can attract tears, but tend to last mostly okay. They're more expensive too.

As for the frame and mechanicals, the functionality is more important than its looks.

Folding bikes are also more useful and flexible than regular bikes.

Answer REPAIR simple at first, and see if there are any show-stoppers like frame damage. Given you have two, its more likely to be a case of throwaway because too lazy, rather than both having the same terminal fault.

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