I need some help with a 1x9 build I've been working on. (I know it's not a SS but the problem is in the 1 not the 9.)
I bought a Trek 850 frame on Ebay (that I read about here, Thanks!) and built it up with...
XT bottom bracket - new '03
LX cranks - new '03
salsa 36 tooth ring 7075 Al - new
XT rear der.
and some other stuff that I had laying around.
Build it up and it all works fine in the stand. Chainline is best at the 3rd or 4th smallest cog in the back.
Take her out for the first ride things are fine, then I stand and hammer and the chain jumps off the front chainring. It will do it in the 7 smallest cogs, (the ones with the best chain line). If I am pushing on right crank the chain jumps out and if I push on left it jumps in. I am thinking something must be flexing, frame, cranks + BB, chain ring??? SO, here I am all excited to get this thing put together and not I can't ride it! Any ideas? I would really like to get this thing rolling!
Should I get some different cranks and try that? which ones? any cheaper options? Try a different ring?
Thanks much for the help!
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Thread: build problem / question...