Originally Posted by mack_turtle

1. I think that chain is too short. on the biggest cog, the guide pulley (the top one, closest to the cassette) is barely making contact with the chain. can you let any tension out of the B-screw?



2. are you certain that the spacers are set up correctly on the bottom bracket? the arrangement for a conventional chainline is important, but you might not be using a conventional chainline at this point. IME, what's important is that the correct number of specific thickness washers are used to set the bearings at the correct width. below is an image from a Shimano manual (page 11) that is probably applicable to your situation. I think Shimano perviously just used two 2.5mm spacers, one on each side, for a 68mm shell, which looks like you have that. if you have the correct number of washers of the right thicknesses, you might be able to get away with moving them around to bring the chainring more inboard. if you put all the spacers on the left side of the crankset and that does not result in the crank arm hitting the chainstay, it could help. I am not certain that it will, but it's worth considering.