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@jashburnham
Yeah the fixed sprocket is on 17 and I was advised to leave that as is, but for the freewheel I'd like a bit more grunt! My commute is on fairly straight roads and they are never that busy - hence not much weaving/bobbing required. I'll also be training in RP which is a pretty straight shot for me, plus early morning = less traffic. What sort of speed/rpm will I get from a 48x16 or 48x15? I'm struggling to get a feel for this given I'm so used to having a compact 54/30 x 11/25. I reckon on the road bikes my favourite combo is 54x15, I reckon that gives me 87.6 gear inches, whereas the 48x17 gives me 74.2. So a 48x15 would give me 84.1 which sounds better. I'm not very technical, but am I along the right lines here - or totally wrong?