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-   -   Wheels/Tyres: R20” tyre pressure advice please. (https://www.volvoforums.org.uk/showthread.php?t=275771)

Stu V8 2007 Dec 6th, 2017 14:32

R20” tyre pressure advice please.
 
I’m ordering four “VREDESTEIN QUATRAC 5 XL - 275/40 R20 106W” to fit the non-standard wheels fitted to my XC90 V8 (2007).
I assume the car originally had 18 or 19” wheels, so the tyre pressure info for the car is now incorrect. Can anyone suggest the best pressures for these (all-weather) tyres please?
Many thanks,
Stu.

Ps. The best price I’ve found so far is from https://www.bosstyres.com

SwissXC90 Dec 6th, 2017 21:22

In the Owner's Manual it states:

07 Wheels and tyres
255/45R20
All speeds:
1-3 Persons 240 kPa front and rear (2.4 bar, 34.8 psi)
Max Load 270 kPa front and rear (2.7 bar, 39.2 psi)
EcoPressure: same as MaxLoad

Stu V8 2007 Dec 6th, 2017 22:56

Thanks, so it states the pressures for 255/45, and you're saying it's the same for 275/40 Swiss?

SwissXC90 Dec 7th, 2017 07:11

It's what Volvo recommends
See the manual, the tyre pressures are pretty much the same for the same diameter wheel regardless of tyre width.

Tip:
2.7 bar on a 20" wheel makes for a very harsh ride, I tried this year and went back to 2.4bar. It also knocked out my wheel alignment on 2.7bar on UK bumpy roads.

So go around 2.4bar and try it.

Stu V8 2007 Dec 7th, 2017 09:53

Many thanks.

jadatis Dec 7th, 2017 13:45

These tyres are allowed to carry 950 kg AT 290kPa/ 42psi up to 160km/99m/h.
The carmaker calculates for max permissable axleweights and up to max technical carspeed the advicepressures.
So if you search those data on car, I can calculate a safe preszure for you.

GreTings from a " Dutch pigheaded self-declared tyrepressure-specialist"
Peter

Stu V8 2007 Dec 7th, 2017 17:12

Peter, although that sounds fascinating, I havent the faintest idea what info you are asking for! Ha Ha.

SwissXC90 Dec 7th, 2017 17:39

Quote:

Originally Posted by Stu V8 2007 (Post 2345576)
Peter, although that sounds fascinating, I havent the faintest idea what info you are asking for! Ha Ha.

You don't understand maximum vehicle weight and maximum vehicle speed?
They are both in your vehicle owner's manual.

jadatis Dec 7th, 2017 20:03

Uou can find MPAW at the VIN-plate , wich has to be on cars in Europe since about 1980.
I is front axle and II is rear axle.
And the max speed you drive, and wont go over for even a minute in your use, you can deremine yourselfes.

colinbos Dec 7th, 2017 21:07

Quote:

Originally Posted by SwissXC90 (Post 2345368)
It's what Volvo recommends
See the manual, the tyre pressures are pretty much the same for the same diameter wheel regardless of tyre width.

Tip:
It also knocked out my wheel alignment on 2.7bar on UK bumpy roads.
.

LOL...... tyres with custard in them would be knocked out of alignment on our bloody roads, Swiss ! :thumbs_up:


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