Is it possible to fit a 36T chainring on a 34T frame?
I think you will have to go with Commencal's specified max chainring size.

Radius of chainrings at center of chain rollers is:

32t: 64.8mm

34t: 68.8mm

36t: 72.9mm

If tooth profile is the same, the tips of the teeth will be a constant height above the center of the rollers, so a 36t ring will be approximately 8mm greater in diameter than a 32t - as you calculated.

Doing a rough analysis on the photo you provided: the gap between 32t ring tooth tip and frame looks to be about the same as the depth of a tooth.



If we assume the tooth depth is the same as the chain roller diameter of 7.9mm, you only just have 8mm clearance. If the chainring does clear, any frame flex will likely result in the ring hitting the frame.