Replacement freewheel to go faster in top gear
My 7-speed shimano freewheel MF-TZ21 (14/28 tooth) is worn out and I need to replace it. But I would like to be able to push the bike faster in top gear, as I am freewheeling a lot of the time even on the flat, unable to turn the pedals fast enough! Can anyone recommend a compatible part that has fewer teeth on the smallest sprocket? I can't see a variant of MF-TZ21 that provides this. Front crankset is 22/32/42 and recently replaced, so I don't really want to have to change that again. Any advice most welcome.