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^^Re seat height - That sort of answers my Q. I didn't know if in cx whether you needed to make adjustments depending on the type of terrain.

I asked the same question on here myself.

I run the saddle on my 29er a tad lower than normal. So my thinking is that if serious CX'ers do the same, and want to do decent road miles on the same bike. They'll need adjustability. No idea though.