7 to 8 to 9 speed
My wife has a hybrid that she insists is perfect for her so even though the gears are knackered she insists I replace them rather than buy a new bike--hence my question . Her hubs are 8spd Deore with a spacer to make them 7spd. Can I drop spacer and use 9spd cassette and chain or am I forced to use 8spd components. I know I will have to replace mechs and shifters to suit which is why I think she should buy a new bike.