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Yeah it started getting 110rpm+ at anything above 55kph with the 46 x 10 i had on the Open.
I was more concerned about the ability to sprint it than with how delightful (ly slowly) it was cruising up a hill in 46x42, but that very much reflects my riding habits and the fact I've not ridden up a proper hill (mountain), let alone a gravel mountain, since last summer en suisse.
And the fact the only off-road the Open saw was Ice-Skating (horizontal) in Essex.......
Not really, you either need to work on your cadence or learn to descend better. My cross bike has 40x11 max and Marathons for the road, it has never been problem.