Join Date: May 2006
Location: Sunset Beach, CA
Bikes: 1978 Trek TX700 1986 Trek 560 Pro Flatbar 1995 Performance (Yes, Performance) M405MTB
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10 Speed to 18 Speed Conversion Chainline Issue
I just recently acquired a TREK 560 Pro (1986) 531 frame and updated it to Shimano 9 Speed with SRAM 970 12-26 cassette. While tuning it up for the first ride I noticed that the chain ,when on the small chainwheel (39) and high cassette cog (12) rubs on the inner face of the large chainwheel. Uh oh, chain line problem I changed out the BB from 109.5 to 119 (just happened to have one on hand, thank you ebay). I still have the same result. It only does this in this gear combination so does anyone have a solution or am I SOL and will not just be able to use this gear combo?