Join Date: May 2012
Location: Ontario, Canada
Bikes: Ebay carbon MTB frame
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Upgraded FD cannot shift to large chainring
Hi, I have been browsing this forum for awhile and this is first time I can't find a solution from previous posts. I recently did my first ground up build on a mtb. I took the components from an old bike and try to install them to the ebay carbon frame. The parts are for 8 speed shimano with alivio RD. The FD is originally a bottom bracket mount C101. Because the FD mount is too low and will interfere with the carbon frame, i bought a Alivio M431 FD (high mount or down pull) and installed on the carbon frame. Also, i know if i took out the C101, i need to take up the space by a spacer. So i bought a BB spacer to take up that gap. I got the RD all setup shifting flawlessly. But the FD, i tried all possible method, the FD just could not push the chain to the large chainring. i read thru all the parktools page, sheldown page and also the official shimano document, plus i have don't FD adjustment before. The FD shift between the small and middle chain ring no problem. But it just cannot shift from middle to large. It feels like the FD is pushing the chain to the back of large chainring but the chain cannot catch to the chainring to bring it up. The crankset is a shimano parts, but its probably a non series parts b/c i cannot see the series name on the crank arm except shimano.
Is the FD compatible with the parts that i have?? Or i need to replace the crank also??? Thanks in advance for the help.