correct tyre pressure in Alto

anyone, plz direct me suitably what should be the correct pressure in tyres of Alto-Lxi?

Amit, please refer your user manual. What it suggest is optimum for your car. Generally it will be around 32 PSI. 

i maintain 30PSI for city driving as per manual. While on highways, i will maintain 32PSI.

Jey, don't u think this should be reverse. On highways the air inside the tyre will expand and it is recommended to come down to few PSIs when on highways.

@Amit: Normally when you are out on highways, you car will have more load (family members / luggages) etc. But that will be not the case on city driving. So it is better to have 2PSI more than recommended. Thats my logic behind that.

Amit - Highway travel is FAST. You know the tyre sidewall flexes as it passes below the vehicle and comes up behint the patch that is in contact with the ground. This flexing heats up tyres and also pushes them towards fatigue failure. If you have LESS air in the tyres, the tyres will get hotter, and fail catastrophically (Burst in normal language).

Therefore, even if it sounds illogical, keep tyres to about 35 PSI (regardless of vehicle) when on highways. Reduces flexing, increases tyre life.

(Note: this is a general guideline, follow at your own risk. Make allowances for road condition, weather etc. No rules can substitute for your brain, so don't switch it off in favor of ANY rule.)

Hey Kris,

Higher Pressure in your tires tend to make your car more bumpy. What's your say on that. Sticking to the Manufacturer's specification is the most ideal one since the car in rigrously tested with these specs. While i say all these, my cars recommended air is 32psi but i always felt more comfortable at 30psi and guess what, all the 2010 SX4 now come with 30psi which is recommended by Maruti Suzuki folks. Neither did the tyre dimension changed, nor did the  tyre brand change.

Joel Chandra

Joel, we are talking about HIGHWAY travel here. Why will the car be bumpy on a highway which is smooth?

Advantages of keeping pressure a bit higher - higher FE, lower tyre wear and better handling is documented elsewhere extensively.

Finally, the decision is his, who owns the car !

I don't know which thread it was, but I had picked up this advice from here itself that the lesser air in tyres should be there while on highway, is safer. That time the reason given was same, tyre burst or catastrophic failure ;)

Amit, could you please point out that post? Must be someone's learning curve was going through a rough patch while posting that. Needs correction, without a doubt.

http://environment.about.com/od/greenlivingdesign/a/tire_pressure.htm

http://seniorjournal.com/NEWS/Alerts/6-04-24-CheckingAutoTire.htm

http://en.wikipedia.org/wiki/Tire#Safety

http://www.pwmag.com/industry-news.asp?sectionID=769&articleID=566846

We could find more, but I take a break now!