• Only one is that it's very heavy for a 650b rims with no braking surface despite the fact it's on par with most 700c rims with braking surface.

    Smaller rims = lighters.

    ZTR Crest is 355g for example.

  • Thinking SL23 for road tyres and the above for knoblies. I can sacrifice some weight for that price.

  • One for disc and one for rims brakes?

    Go for it, unless it's on the same bike, just go for the DT Swiss, smallest 650b road tyres are about 32mm.

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