Just want to share with fellows. Brought my 18 RLX hybrid for some maintenance last week.

- swap to the tlx 18" rim and tire size. (235/50R18). Ride is better over the bumps. It feels a bit more bouncy. Road feedback is slightly lower but negligible. The "grinding" feeling with oem 19=" wheel and tire previously is gone.

- did oil change, transmission fluid and twin motor fluid change. Not sure how the shop did it , but the car drives much smoother now. I try to see if it's related to the tire change. It may be, but now when I reverse that really bad shudder (when it's on ICE) has gone! I do feel very slight shudder if I tap the brake during reverse, but it's nothing near to how bad it.was before! Not sure how long this will last but looks like some fluid change help.

Mind that I did transmission.fluid and TMU fluid change last year in around 30000km already, unless the dealership lied to me