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@Zippie
48x17 with 25mm tyres gives about 74". I can get up any hill I need to although Highgate area is a push and 30 mph is quite achievable on the flat without spinning out. I would try around 74" unless you are going for long rides with steep hills. I dropped down to 71" once or twice but just couldn't stop myself putting the 17 back on a week later ....