Originally Posted by
puregsr
It feels like my chainline is kind of messed up. Ritchey compact double (50/34) and 10 speed 105 cogs (12-27).
Pedaling in small chainring and largest cog, large chainring would occasionally rub and catch the chain. Not sure if it's an adjustment issue or not. Quick measurement shows that it might be 2mm off the presumed 43.5mm chainline.
The chain should be nowhere close to the big chainring when you are in the small ring and the largest cog. Do you mean that you are in the
smallest cog in the rear, and so the
highest gear available when in the small ring? That's a common problem due to the size difference between the 50T and 34T chainrings, and one of several reasons you should be in the larger chainring at that point.