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I'm on 75 I think - from experience, that's good for flats (which is what I 'optimised' it for) with the occasional hill, but to just go up and down hills... a bit on the high side, if you value your knees! Still tempted to give it a go though. From the initial description, this is not necessarily going to be the Sagan hill sprint awards, right?
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I've been on hills rides with @Ecobeard and the only sprint is the one to the pub
72GI is spot on for this stuff, so anywhere around that will be alright.
when I say "this stuff" I mean the classic route....