Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
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8-speed road hubs are 130 mm OLD and the same as 9 and 10-speed so you could continue to use your current wheels with just a cassette change if they are in good condition or any new wheels will also fit your frame.
As to other upgrades, are your current 8-speed shifters operating properly? If so, I'd just keep them going. If not, upgrading to 10-speed will require new brifters, a new chain, new cassette and, possibly a new front derailleur. BTW, 9-speed road components are still available but are a generation out of date so stick with the 8-speed or go all the way to 10.