Bicycle Mechanics - Question about upgrade from 7 to 9 speed
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01-12-08, 03:59 PM
My main roadie is a older Cannondale SR500 that originially had RSX triple X 7-speed brifters. I recently acquired a set of 105, triple X 9 speed brifters with 9speed cassette. My only concern about making this conversion is, will I still be able to use the RSX crank and chain rings and the RSX front derailer with 9 speed? (pics below)
I also picked up a Bontrager ISIS crank, triple that came off the same bike as the brifters, so if there is an advantage to changing the cranks I can, but if there is no advantage, I'd prefer not to.
Please do not comment on the rear, as I'm good to go there.
01-12-08, 04:15 PM
The crank will work fine. However, I think 9- and 10-speed cranks space chainrings a little closer to each other to keep the narrower chain from getting stuck in between, but in reality it should not be a problem.
The front derailleur will work okay, but shifting may not be quite as smooth because the cage will be wider than necessary. On the upside, chain rub in the middle ring will be practically non-existent. Try it, you can always get a new FD if you feel like you need to later.
May go without saying, but don't forget the 9-speed chain, too.
01-13-08, 08:39 AM
Thanks Jive Turkey, it sounds like it will work, but a 9 speed specific crank and front dr would work better. I'll probably try it as is and if I don't like the performance, then change out components.
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