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@AlexD
Update for those who care: I did the last track session on a hire bike and spent the whole time wishing i'd manned up and brought mine.
I've got another in december and i've spoken to Newport Velodrome and have convinced myself to take the old girl then. I seem to remember the hire bikes being 16x50. My bike is currently 16x44 and has 130 bcd cranks, slightly limiting my track chainring choice, so I'm putting a 14t sprocket on it instead to achieve roughly the same GI. Can't see any immediate drawbacks to that - am I missing something?