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the tyre says 440?
And you’re absolutely right. Sorry. I had my Raleigh hat on!
I am led to believe some 451 tyres will fit those rims. As I said, I have some you can try (kenda small block 8s and schwalbe duranos off the top of my head and maybe some Raleigh records). But this could be crap info.
I’d try softer grade pads (koolstop salmons, maybe) or leather-lined pads are supposed to be better also. Don’t expect modern braking performance, especially in the wet.
I was/am a big lump, so went for (annoyingly expensive) alloy 451 rims and upgraded my brake callipers also to stiff odyssey bmx ones. Tyre choices are decent for 451 rims and brakes don’t have to be such long reach, making braking better, as there’s less flex. With bigger wheels, you’re higher up also, so less chance of pedal strike in corners.
Edit: you can also use shorter drop brakes with a drop bolt on the smaller wheels to try to reduce flex.
And for a laugh, search for the single speed shopper of death thread on here... (warning: can be a bit of a rabbit hole)
the tyre says 440?
edit: sjs says that there are 3 categories of 20"
https://www.sjscycles.co.uk/tyres/
what pads would work better?