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Can I upgrade from 8 spd to 9 spd w/o changing derailer?(3 posts)

Can I upgrade from 8 spd to 9 spd w/o changing derailer?Scy
Jul 25, 2001 10:33 PM
I have an 8 speed Shimano 105 gruppo and want to upgrade to the 9 speed to get the 16-tooth cog. Cash is tight (kid, mortgage, and student loans) and I want to know if I can do this by just changing the right STI shifter, chain, and cogset, without actually changing out the rear derailer. It seems to me that the range of motion of the 8 and 9 speed are the same.

What do you think?
Yeah, But....grzy mnky
Jul 26, 2001 3:04 PM
Yes, the rear der. will work for 9 speed, but in addition to the parts mentioned you should get a 9 speed inner chainring. The spacing on the 8 speed is a tad wider and you'll have some balky shifting up front with the more narrow chain.
Performance has an upgrade kit.. @ $259Mike K
Jul 26, 2001 8:58 PM
Try this...

Upgrade your Shimano 8-speed bike to 105 9-speed the easy and inexpensive way! You'll get everything you need to make the change, and save money when you buy the kit. Includes Front and Rear 105 STI shifters, 105 rear derailleur, Ultegra cassette and 105 chain. We also recommend using the Ultegra inner chainring for 9-speed road

And mnky is right about getting a new chain ring.