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Old 09-24-09, 09:02 PM
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joejack951
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Bikes: 2016 Hong Fu FM-079-F, 1984 Trek 660, 2005 Iron Horse Warrior Expert, 2009 Pedal Force CX1, 2016 Islabikes Beinn 20 (son's)

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2005 Sora is 8 speed. To switch to Tiagra (9 speed) or 105 (10 speed), you'll need at least a new chain and cassette along with the shifters. Ideally, you'd also replace the front derailler. Shimano used to offer Ultegra-level 8 speed brifters styled like the newer shifters but they don't seem to be available any more.
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