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@Hovis
Assuming youre rocking 700c wheels with 23mm tyres, youre rocking 69gi. A lot of people roll on 46 17 which gives 71.1gi. I quite liked that ratio for riding around the city, although I have since moved up to 48 17 giving 74gi. I would recommend 46 17 personally, espec for a newbie but hey, everyones different.