Clark W. Griswold
Join Date: Mar 2014
Location: ,location, location
Posts: 13,689
Bikes: Foundry Chilkoot Ti W/Ultegra Di2, Salsa Timberjack Ti, Cinelli Mash Work RandoCross Fun Time Machine, 1x9 XT Parts Hybrid, Co-Motion Cascadia, Specialized Langster, Phil Wood Apple VeloXS Frame (w/DA 7400), R+M Supercharger2 Rohloff, Habanero Ti 26
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Sounds like a poor idea both in that it is not a great idea but also will make you much poorer. It is 8 speed just ride it as is and if you want better gearing come into the 2000s with some 10, 11 or 12 speed and you can get more practical cassettes. For now just use what exists on the market like 11-28 or 12-26 or 12-23. Plenty of options that are fine for lower initial cost bicycles. The only reason I might invest in something 8 speed if it is XTR/XT or Dura Ace/Ultegra from that era but even then I would probably just upgrade to a 9 speed shifter and run it all as 9 speed.