• I went 650b after several years of ^this type of annual tyre/guard fiddling.

    On my steel road frame the conversion was pretty straight-forward. It gave me the 32mm tyres + full guards that I really rate for winter/night riding. My winter bike has reached a state of low-tech nirvana. It also looks particularly heinous now it sports a crabon™ SMP and huge lights.

    Things to bear in mind if you go for it...

    tyre choice isn't huge. I think there are plenty of good tyres but you can't walk into a LBS and pick some up, so buy a bunch (and make sure they're folders if you want to tour).
    pedal strike can be an issue, so don't use wide pedals.
    I think maybe braking isn't quite as tight as on the Campag short-drop Centaur brakes I had before, I'm not sure this is related to the new rims or the nature of (very) long drop calipers. The difference is really tiny.

    With disc brakes giving no penalty to differing rim sizes on the same bike I wonder about having a set of 700c summer wheels, alongside some 650B winter wheels.

    Depends on what tyre I could get into my fork of course.

  • Depends on what tyre I could get into my fork of course.

    32mm definitely, unsure of 38mm* , I can bring some Hutchinson to Matt for you to fit, it's the same tyres as @miro_o, nothing special, just average.

    *I will have some lightly worn 38mm lightweight tyres to find out.

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