• I'm also building my brother a bike as he's doing it too and with even less experience. He's training on the old 1987 Rockhopper but it will just be destroyed by the 'Puffer.

    We're building him the following:

    1. On-one 45650b
    2. Rockshox 30 Gold TK Forks (120mm travel, tapered)
    3. Deore M615 brakes (180mm up front, 160mm rear)
    4. SLX M670 shifters with RD-M592 and XT-M786 mechs
    5. FSA comet crank (38/24) - not sure what cassette to pair with this? and if it will need a 'chain device' I've never had a bike with a chain device.... what even is a chain device?
    6. On-one heavily discounted stem, bars, seatpost and clamp
    7. 650b wheels that I have in the garage (9mm QR but they're free)
    8. Brooks All Terrain saddle
    9. Continental x-king tyres

    So need to get grips, cassette and SPD pedals. Any recommendations?

  • XT or SLX are a good shout, they're similar weight (~20g difference), go for whichever is on sale. Deore is heavier (100-150g I think) but usually super cheap, that might be a plus for a winter 24h race as you'll probably need to replace the entire drive chain afterwards anyway.

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