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@clefty
when I flew down Ditchling geared, I loved it - hit 40mph and set off a speed camera
when I did it fixed, I struggled down, front brake on for most of it shitting myself and not getting over 25mph. I know what I'd rather do.
I did it 42/15 (about 74 GI?) last year and my thighs fucking burnt for 2 days afterwards, I would go for something in the mid to late 60's GI wise, but it will be spinny as fuck on the downhills.