• Looks like I've secured an On One Scandal frame for not too much money so project MTB is go.

    I'm planning to run it with the On-One monocoque carbon forks and an SLX 1x10 setup. Some questions:

    Do I want cooling fins on my brakes (I very much doubt it'll see Alpine descents)?
    I'll need post to IS adapters front and rear, yes?

    Is there any way to estimate overall reach on a mountain bike based on a road/cross bike fit? At least to get an starting point on stem length.

    29er wheelsets around £150? Shimano MT66 can be run tubeless, seem to get reasonable reviews and would match everything else.

  • Do I want cooling fins on my brakes (I very much doubt it'll see Alpine descents)?

    If they are free, go for it. If not, don't pay for them.

    I'll need post to IS adapters front and rear, yes?

    Looks like it - but IS to Post - from a quick squint at some images. Your brakes will be PM, the fork and frame IS. Your brakes should come with them.

    Is there any way to estimate overall reach on a mountain bike based on a road/cross bike fit? At least to get an starting point on stem length.

    Assume you want a fairly agressive XC fit, so how about starting with the bars being roughly in between your hoods and your tops? You could probably work out roughly what you need to achieve that by looking at the reach on the two frames, then assuming it's comparable, then add 10-20mm to the MTB stem

    29er wheelsets around £150? Shimano MT66 can be run tubeless, seem to get reasonable reviews and would match everything else.

    I'd get some Stans Arch built on to Shimano XT or something, but it's difficult to argue with the MT66. Note the MT66 appears to be centrelock so you'll need centerlock rotors or an adapter (I have some if you need them).

    Now which tyres...

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