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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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Make sure to bring a few sets of spare brake pads and split-pins, as well as small pair of pliers to change them.
And check your pads every lap - on a 12hr race last year my friend's pads wore all the way through the friction material, then through the backing pad, then started wearing into the pistons... you don't want to do that.
Incidentally I am wondering if it's possible to make a device, similar to a flint-catcher I suppose, that slices off excess mud before it leads to complete clogging of the chainring.
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@mi7rennie
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:
So need to get grips, cassette and SPD pedals. Any recommendations?