Old 07-25-22, 12:56 PM
  #6  
Bill Kapaun
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Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
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Bikes: 87 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds. 2019 Giant Explore E+3

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For a starter, measure your drop out widths, both front & rear.
That will help determine what you can do as far as number of cogs.
Hopefully the front is 100mm. Some older bikes had narrower spacing which will cause "issues". (<100mm hubs are old & hard to find)
Rears can vary, depending on the era/#cogs.

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