Bigger Rim And Ride Comfort

[sherlockyou]

will bigger rim decrease the ride comfort?

[Atlantis]

In general, yes because there is less sidewall of tyre to absorb any deviations in the road surface.

In reality, the difference is minimal. I went from 17" to 20" and could barely feel the difference.

A change in springs/shocks would give more of a difference in feel than wheel size.