• I have circled an obvious gap between your chain and ring, this tells me your chain is very worn and I suspect your chainring will also be badly worn.

    Your freewheel might not be so bad (it's steel, the chainring is probably aluminium) but given the state of that gap, replace the freewheel too.

    The rear caliper is likely seized up, you can clean it, strip it, rebuild it etc but paying someone to do that won't be economically viable so you're probably better off replacing it.

    There's probably around £60 worth of parts in the drivetrain, maybe £80 if you want a nicer freewheel like a Halo, less if you buy stuff off the classifieds on here. I'm sure there's someone that'll help you fit it all for a couple beers.

    If money is an issue, don't be tempted to do the job bit by bit, you'll only end up with a bike that runs like shit, run the current components into the ground while you save up for all the parts. I don't see anything that's going to break anytime soon.

  • Could be Bio-pace chainring. Would give similar gap even if new. :P not likely, but hey, you never know :p

    I've seen drive trains neglected like that on my own Fixie commuters of the past. Hard to judge from photos but I'd say yes to: chain, chainring, bottom bracket and freewheel!

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