Originally Posted by twocicle

I did some more "tooth profiling/filing" and testing last night on the workstand. The chain seems to climb ok, but when shifted at the sharp angles noted above (ie: when cross-chained in the 1st-4th rear cogs), the chain seems to snag oddly on the big ring for the first link or two, then the rest of the links are hung up on the tops of the teeth. It is not really "skating" but hanging up on the teeth. The further inward the cog in use, the worse/more frequent the snag happens. When shifting while using the outer half of the cassette cogs the chain angle is less and the problem never occurs.