tires fitted but 32psi applied whilst tires off car by garage

[omodos]

this is wrong isnt it?guys fitted my alloys and tires but each time inflating to recommended pressure whilst alloys /tires were not on car....

[nom3rcy]

That is the proper way to do it

[JCL]

Tire pressure won't change measurably with static load.

Overloading and then driving will cause the tire to heat up, and that will change the pressure, but from a static perspective, on or off the car doesn't matter.

[omodos]

ok thanks guys, physics was not my strong point at all, and I need to get my tires and alloys checked up front perhaps?, midday I set the pressure up front to 2.3 bar this after about 10mins of average driving(wrong thing to do really), and 6 hours later and car resting (and a drop in outside temps of about 9C ) one tire was 2.0bar and the other 2.2bar....gonna have to see what reading i get tomorrow morning cos these fluctuations sound extreme....

[JCL]

Measure them cold. Also, use a second gauge to verify the one you have. Tire pressure gauges are cheap, and can easily read incorrectly. I have two that I check against each other every now and then.

[omodos]

thanks JCL, you are right, i 'measured' using the gas station gauges , the electronic type didgital readout....maybe should by a couple of decent pocket held ones

[omodos]

Well read my tire pressures this morning at 2 separate gas stations and both fronts were 2.2 bar, so a drop from 2.3bar(lastnite) to 2.2bar 12 hours later whilst car was stationery overnite normal?(also temp at time of reading was 1.5C down on last nites temp), i have never been so finicky over this, but good to know if normal? and it does bug me that the front tires do look seem to bulge at ground moreso than rears although they are at the same pressure, i guess it is the engine bearing down on the fronts?

[JCL]

It isn't the engine weight, since the vehicle has close to a 50/50 weight distribution.

It is very difficult to see a low tire with modern low profile tires. The sidewall bulge is not indicative of pressure, it has more to do with a bump on the ground than with the pressure.

If you used two different gas stations to measure the pressure, did you use two different pressure gauges? You need to use the same gauge to have any validity to monitoring changes in pressure.

[omodos]

Originally Posted by JCL

It isn't the engine weight, since the vehicle has close to a 50/50 weight distribution.

It is very difficult to see a low tire with modern low profile tires. The sidewall bulge is not indicative of pressure, it has more to do with a bump on the ground than with the pressure.

If you used two different gas stations to measure the pressure, did you use two different pressure gauges? You need to use the same gauge to have any validity to monitoring changes in pressure.

JCL thnx for reply, had no idea about weight distribution! weird thing is this bulging is not really visible to the naked eye, but on close inspection the fronts have it, you maybe right though only made a point of noticing when the car is parked in the garage (and my old 19" alloys/tires had the bulge)

Nope never used two different pressure gauges( pocket type ones i gues s is what you mean?) I will recheck the pressure at the last gas station I used to measure pressure last....curious to know what type of a drop in presssure is needed for bing noise to alert me to a significant drop, anyway these Avon rangers sport are pretty noisy! but handling is fine cannot tell a different compared to my michelin diamaris

[omodos]

Tire Air Loss Tips | Goodyear Tires Canada

this is from goodyears site, and the bulge is normal they say


How much air should I put in my tires?

Proper inflation is the single most important part of tire care. The inflation pressure on the side of the tire is the MAXIMUM operating pressure. It is not necessarily the right inflation for your vehicle. Always use the inflation recommended by the vehicle manufacturer. You can find it in your owner's manual, posted on the edge of the driver's door, on a door post or on the inside of the glovebox door. Always check inflation when tires are COLD: when the vehicle has been driven less than a kilometre or one hour or more after driving. Use a good quality tire gauge. Note: It's natural for radial tires to have a slight bulge in the sidewall at their proper inflation pressure. Check or adjust inflation every few weeks, before any long trip or if traveling with a heavy load. And don't forget to check the spare. Your Goodyear Retailer can answer any questions you may have about tire inflation.