digitalmouse
Thanks for the reply. Schlumpf's an interesting alternative but not anywhere near as flexible for gear ratio selection and not as light by my reckoning. I'm thinking of putting a 12T freewheel on a 48/40/34 triple crank on ~12 kilo builds. Will I need lower than a 34/12 gear for chubbies going up a hill? How big a change in chainring size is problematic?