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R20” tyre pressure advice please.

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Old Dec 6th, 2017, 14:32   #1
Stu V8 2007
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Default 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

Last edited by Stu V8 2007; Dec 6th, 2017 at 14:34.
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Old Dec 6th, 2017, 21:22   #2
SwissXC90
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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
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XC90 R-Design MY2009, Black Sapphire Metallic. HighPerformance Sound, RSE, Navigation, Telephone, Parking Cam, BLIS, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.
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Old Dec 6th, 2017, 22:56   #3
Stu V8 2007
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Thanks, so it states the pressures for 255/45, and you're saying it's the same for 275/40 Swiss?
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Old Dec 7th, 2017, 07:11   #4
SwissXC90
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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.
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XC90 R-Design MY2009, Black Sapphire Metallic. HighPerformance Sound, RSE, Navigation, Telephone, Parking Cam, BLIS, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.
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Old Dec 7th, 2017, 09:53   #5
Stu V8 2007
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Many thanks.
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Old Dec 7th, 2017, 13:45   #6
jadatis
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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
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Old Dec 7th, 2017, 17:12   #7
Stu V8 2007
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Peter, although that sounds fascinating, I havent the faintest idea what info you are asking for! Ha Ha.
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Old Dec 7th, 2017, 17:39   #8
SwissXC90
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Quote:
Originally Posted by Stu V8 2007 View Post
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.
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XC90 R-Design MY2009, Black Sapphire Metallic. HighPerformance Sound, RSE, Navigation, Telephone, Parking Cam, BLIS, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.
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Old Dec 7th, 2017, 20:03   #9
jadatis
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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.
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Old Dec 7th, 2017, 21:07   #10
colinbos
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Quote:
Originally Posted by SwissXC90 View Post
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 !
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