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 |
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 |
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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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. |
Many thanks.
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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 |
Peter, although that sounds fascinating, I havent the faintest idea what info you are asking for! Ha Ha.
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They are both in your vehicle owner's manual. |
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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