Originally Posted by _ForceD_

This ‘might’ be an issue…but maybe not. A few years ago I wanted to change one of my bikes from the usual 52-42 chainring setup to a 54-38 combination. I got everything reassembled and discovered that now with a larger circumference big ring and smaller circumference small ring, that the geometric angle of the chain from the small ring back to the cassette smaller two or three gears caused the chain to catch on the larger ring. I couldn’t get it to work and had to change back to the original setup. Here’s a crude drawing of what I mean.




Dan