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I've ridden parts of it on 35 slicks/cross tyres and done Kirkby Stephen to Buxton on a SS 29er a couple of times.
I think Buxton to Matlock runs along the old railway line (maybe?), in which case it's used on a few audaxes and fine on a roadbike unless it's been absolutely pissing it down, then it gets a bit muddy in places.
Everything is pretty gritty, but nothing's super technical.
Kirkby Stephen to Settle is a bit rocky. Then there's a slog through farmland until you get outside Hebden Bridge. Hebden and the MTL is probably the most technical section.
Can't remember exactly what the run to Buxton is like but I'd guess gritty farm double-track for the most part.
There are gates. So many gates.