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@deleted
I did most of my Rapha 500 on coastal roads on 66GI and there was a wind above 18mph every day...no way I would have tried that on 84GI given the conditions that you had last night!
Valid point on lights and junctions too...
To be honest the main reason why I settled on 84 is that I happen to have odd numbered cogs from 13 to 19. Having 17 on the back was too easy for a bloke who struggles to spin above 90 and has only recently learned to manage that.
Hoping my time spent on the turbo doing spinning drills is going to pay off. In any event I plan to TT geared.