I don't know the 7800 cassette .. but is it possible to split the cassette and respace the cogs with spacers from an old 9 speed cassette to suit a 9 speed.
Alternatively your cash may be better spent buying a new hub as you've got to rebuild the wheel. Machine time is not cheap unless you know someone who'll do it at mates rates.
I don't know the 7800 cassette .. but is it possible to split the cassette and respace the cogs with spacers from an old 9 speed cassette to suit a 9 speed.
Alternatively your cash may be better spent buying a new hub as you've got to rebuild the wheel. Machine time is not cheap unless you know someone who'll do it at mates rates.