• I already do use it for tarmac and offroad with different 650b wheels. This is about 700c compatibility to cover fast road riding case with light tyres. Which I have decided isn't sufficient to justify a new version of a bike I already own.

  • Right, yeah, it depends how keen you are to ride fast on the road and what your "fast" is? Are your 650Bs actually a limiter? Just pedal harder :)

    Actually since you've mentioned this, what is the fastest 650B road tyre, do you think? Surely there's something smaller than a 47mm Horizon that's slicked up and lightish.

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