being a 5 speed it is most likey a freewheel not a cassette. take off the freewheel and put a singlespeed freewheel on. re dish wheel as you will need to respace rear axle to get correct chainline which will move rim off centre.
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being a 5 speed it is most likey a freewheel not a cassette. take off the freewheel and put a singlespeed freewheel on. re dish wheel as you will need to respace rear axle to get correct chainline which will move rim off centre.