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Looking forward to your report! I'm so keen to give it a go as well but I now realise that I recently did 2200 meters of fixed climbing over 100 miles (most of the climbing was off road) and I was proper fucked afterwards so another 1500m of off road climbing on top of that seems not yet achievable for me, even if I lose almost 20gi and go SS. But don't let my weakness discourage you!
Just squeezed some 29er tyres into my sscx setup. Think I might give this a go.