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@BringMeMyFix
Rob English is pure class. I know he tried experimenting with aluminium cassettes, but they weren't up to the task of hillclimbing.
I had a look at the map contours for Windsor Hill. Guessed a mid 60...?
I usually work to the hill's maximum gradient, and being slightly overgeared on that. 25% is about a 55", 15% about a 65", and 10" about a 75". Something like that anyway. There's always the wind and stuff to deal with.