Recently I have just changed my tyre from 175/65/R14 to 185/60/R14 both are Bridgestone Ecopia EP150. Rim sizes I like to remain as mentioned above FC will be bad and pickup will be slower. So far the grip and rolling resistance has been better than before. My bezza is equipped with UR bar front and back. With the 185 it's great price is rm150 tho.

I think i can conclude that changing the rim to 15 x 6.5JJ ET35 with michelin ps3 195/55/R15 for RM1200 per set of 4 is the best solution for a tyre upgrade on Bezza. Since the max offset is ET35 which means no rubbing of rear fender on max load (correct me if im wrong). But i just thought of something, what if the rim is lightweight? i see some shops offer lightweight rims. For suspension/absorber/shocks/springs i think is best to upgrade to fully adjustable ones, as you can set the ride height and hard/soft ride depending on the driver perspective. Yes the warranty of the suspension components will be void but this is an upgrade, unless you change with perodua genuine parts.

Just my thoughts on reading this entire post and my overall experience with cars so far.....

Exactly! I can't recall what was the weight of the wheels they sold but if im not mistaken it was stated 7.5KG. Maybe will update once i got to know the weight of the stock rims and the "Lightweight" rims.

Most probably, maybe better on 205/50R15. Any thoughts on Ultra Racing full stage for the bezza?

Is not small, is better if you have the proper width of that 14 inch, but for the stock rims you can upgrade to 185/60/R14 tyres is 175/65/R14 when stock.

Then u can upgrade the power from Max Racing once you have upgraded to 205/55/R15 tyres with myvi rims. or use 195/55/R15 tyres with myvi rims.
Btw, do you guys feel any weird body roll issue after installed 185/60/R14 tyres? Currently using Bridgestone Ecopia150. Besides that, any pickup issue?

For the Ultra Racing bar, i might try until stage 2 see is it worth going to stage 3.