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@gipper
My 725 came with 48/15 ratio from a guy who rode it on the track. I rode the gearing for a while but found the acceleration was lacking but top speed good, changed to 48/16 which was better for street and all round flat, then dropped to 48/17 as my commute changed and encountered some hills (sydenham hill area) and found it to be good for both hills and flat.