Originally Posted by
Cassopher
Are you certain about this? I ordered a 12-28 to see if that helps. If that doesn’t help me the worse case scenario is just selling the PM & standard chainring and then go to a 52.
Actually, that is only true with SRAM or S works cranks with replaceable spider. Not true with Shimano- my bad.
Changing from 53 to 52 chainring would reduce speed at 100 rpm from 37.8 to 37.1 mph. That is likely not the reason for changing gearing. Most folks go to 34/50.
Play with this:
https://mike-sherman.github.io/shift/