(similar question: Front Derailleur Chainring Size Tolerance)
I am trying to understand the possibility of maximum difference between chainrings on road bikes. I currently have Shimano GRX 48/31 (difference 17) which works fine. How can I see what is the maximum difference? The link above mentions:
According to Shimano front derailleur specs here all road triple front derailleurs support max 50 tooth and have 20 tooth capacity
However I couldn't find anything about that in the linked document. Would it be possible to have Ultegra chaingring 50/34 with the 34 replaced with a smaller one? Like 50/32?