You mean 195/60R15?
I used to pump around 34 PSI (235KPA) for the front, and 32 PSI (220KPA) for the rear. Eventually I reduced it to 32/30 F/R cause the my tyres no longer gripped that well plus they were still a little too soft to corner as hard as I would like to.

max 220

Mostly front 220 [32] ( due to engine heavy)
rear 210 [30]

Yaya. Even pumo until 220. The tyre still look like not enuf air.
Soft tyre =)

mine changed to sport rim already, stick with stock size 195/60/15 

Find something that you're comfortable with. Otherwise if you insist, 32/30 PSI for front and rear respectively.
The R3 rims look really nice to me. But they are 16" in size, so you will need to get new tyres as well.

Many factor will affect the car's stability. On stock form, usually most local crap Plotong only balance up to 110kph, which is the highest legal speed limit. Given the rubbish Cibaistone tayar, if you balance it properly, yes you can still enjoy smooth sail over 180kph(I didn't mention you can brake on time or save you from swaying away).

Come on bro, let's face the truth. You're paying SUPER VALUE for a SOHEM VALUABLE Plotong car. In these price range, Persona is 1 of the best handling car you can find. May I know which car were you comparing the stability of above 140kph? Handling is very personal feelings, I don't know how to read your justification. For some sohem like myself who used to ride a Ganjil 660 at 120kph(I guess that's the top speed it will go), Persona is God like kinda stability despite tayar bunga habish

I only drive till 145-150 for now. So far so good. Not shaky at all. Got mine early this year sv too.
The last time  drove frens almaera at 120 whole steering shaking. I guess high speed persona for me better. Just the plastic noise. Regarding the dust on the brake I think should be the brake pads.

Yes I do. dont bother me much at times. just that my passenger sit above the aircond hole there is making very loud noises when i travelling in bumpy roads( example yellow line on road). ill try send it for inspection during my 20k svc
Bad QC i have to admit. regarding after sales i think sometimes depending on the centre u go. i have quite ok experience with the after sales svc.
I dont feel vios is super good. its just a more decent car compared to plotong.

wow. i didnt know about the engine valve leak.
VIOS owner! are u the otai david talking about?

Even on 200 also stable 

Wow you are really unlucky, lemon unit bro. Luckily my Sv still working fine. Touch wood.

mingwei1992 is right. Dirty tayar is caused by rubbish berakpad. U may change to some higher metal compound berakpad, but then later the metal berakpad will grind your disc, then you komplen rubbish Plotong give rubbish disc. So, doesn't matter lar since you hate Plotong already, it doesn't serve any purpose already. U may carry this piece of junk for awhile, probably until you have enough money then buy a VIOS. I bet that will carry you to an entirely new region of satisfucktion. Don't get me wrong, I hate Plotong as much as you do, it's just that I got no choice but to stuck with them. They got the worst resell value car, cheapest made material, and worst finishing that even harsh to compare with China made rubbish truck. It's just that, it's still cheaper then a China car. Part wise? I don't think Plotong is that bad. However, the money you paid for, is seriously lack of AFTER SALES SERVICE and ULTRA BAD FINAL PRODUCT QUALITY CONTROL. So, either you patiently bear with it, try to DIY fix those minor crap bit by bit and enjoy the car instead of resenting. One day, just 1 fine day you save enough then go bai a VIOS and ditch the Crapro, come back and tell us, we'll celebrate for you

p/s: Oh btw, drive it harder, soon you'll discover the engine valve cover start to leak oil and spill all over your engine bay. It happens to all Kampro a.k.a Crapro engines regardless which model/variant.

p/s2: Oh btw of btw, there's a well known otai bought his banana 2nd day engine blow(no he's not even driving fast, the crap engine just jammed and died on him with no reason). That sohigh bear with that piece of lemon for years, spent his heart and soul on it, fix car price already more then the car value he paid for. In the end, he pushed the car over the cliff and went bought a white VIOS