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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First, assuming its a Shimano 8-speed rear derailleur and NOT Dura Ace, it will work fine with your 9-speed shifters, cassette and chain. I'm currently using a 105 8-speed rear derailleur on an otherwise all 9-speed 105/Ultegra bike and it shifts perfectly.
Second, Tiagra 9-speed (like both 105 and Ultegra 9-speed) brifters are both double and triple compatible.