Join Date: Feb 2011
Location: Zurich, Switzerland
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Mixing 8 and 10 speed drivetrain components
I know this has been discussed before, but I just wanted to chime in with my questions/experiences in mixing 8 and 10 speed components.
I have an older bike with full 105-1056 components -- 53-49 double crank, 8 speed (14-26) cassette, STI shifters, (all from the late 90's), and 8-speed chain (not vintage -- just in case anyone was wondering how long a chain could last, but that's a discussion for a different thread
). Wanting to make it a little easier to get up the hills in my area, I swapped out the crank for a Shimano FC-R700 compact (that is spec'd to be 9 and 10 speed compatible) with 6700 bottom bracket, lowered the FD about a quarter inch, and left all other components unchanged.
I was preparing for some difficulties in the front shifting due to the wider chain, but was pleasantly surprised to discover that, after a painless FD adjustment, everything shifted as well as it had previously. So far, the components seem to be fully compatible.
A number of threads here have mentioned that you need to switch to a 9-speed for such a setup to work. My question is: if there's no problems with the shifting, and the chain isn't rubbing against chainrings anywhere, is there any need to put on a narrower 9-speed chain? Are there any other potential problems I should be looking for? (The chain probably has > 200 miles on it, so I'd just assume not change it if I don't need to)