Old 04-23-19, 11:51 AM
Dave Mayer
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Lots of good maintenance suggestions here.

Except note that the current generation of 11-speed Shimano rear derailluers (plus 10-speed Tiagra) will not be compatible with your shifters.

At our bike Co-op, I would help you install a new chain, new cables and housings. Plus a light spritz of WD40 on the guts of the STI shifters. This would take 30 minutes and cost around $60 all-in. There would be a 95% chance at this point that your shifting would be perfect.

Plus I'd check the rings and cassette for excessive wear. If they were kaput, then things would get more expensive, but still less than the cost of a new gruppo. Likely only your small chainring would need replacement. And if your cassette was worn, we have a large bucket of replacement cassette cogs which could be scavenged to replace only your worn ones. At $1 per cog.

Anyway, all of this would be far cheaper and faster than complete drivetrain replacement.

Plus, you wouldn't have to buy new wheels, as you would with a 11-speed 'upgrade'.
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