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  #1  
Old 24th March 2018, 11:27 AM
GlynH GlynH is offline
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Default Tyre pressures Dunlop 275/35 ZR21 on A8L

I have a set of 21x9J Audi 5-Spoke Rotor Titanium Alloys on my car fitted with 275/35 ZR21 103Y Dunlop SP Sport Maxx GT tyres.

The sticker on the inside of the drivers door only goes up to 20” and the Owners Manual unhelpfully refers you to the sticker stating tyre pressures.

The n/s/f tyre looks to be a little low and only has 23psi in it and the other three hover around 26-27.5 psi all of which seems low to me.

The Kwikfit site although it recognises my car from the registration number draws a complete blank on tyre pressures for all tyre sizes.

The Dunlop website although it details the technical specs for the tyre omits probably the most important item...pressures!

So my question would be what are the recommended tyre pressures for these tyres on my 2014 Facelift A8L?

I think I’ll pump them up to 36psi all round for the time being until I get a definitive answer.

Thanks & kind regards,
-=Glyn=-

Last edited by GlynH; 25th March 2018 at 04:58 PM.
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Old 24th March 2018, 06:18 PM
tc4332 tc4332 is offline
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36 is a good bet as far as I am concerned. My tame tyre man agrees with me.
I have played with pressures but finally opted at 36 on a cold day. I do monitor pressures and temperatures on each wheel including the spare with a TyrePal system.
The only problem I have is SWMBO panics if there is a discrepancy of one pound in the tyre pressures. Three at 36 and one at 35 has her crawling all over the roof lining.
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Old 24th March 2018, 08:50 PM
ainarssems ainarssems is offline
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23 is definitely too low, 32-42 would be my recommendation depending on load and driving conditions so 36 seem like a good middle way.
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Old 24th March 2018, 08:56 PM
paulrstaylor paulrstaylor is offline
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36-38 front, 32-39 rear......

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Old 24th March 2018, 09:36 PM
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Conan_the_Librarian Conan_the_Librarian is offline
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When I did one of my advance driver course with an ex Met Police examiner we discussed tyre pressure in non standard tyre and wheel combinations.
His recommendation is to set up at a datum (say 34 in your case); then drive the car the manner you intend (urban, motorway, track) and once the tyres are at operating temperature measure them again. You are looking for an increase of 10%. If it's higher than 10% then the tyres were under inflated when cold. Under 10% then they were originally over inflated. It's all about sidewall flexing. Of course it also depends on the manner in which the car is being driven. There are no, one pressure suits all occasions.
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Old 25th March 2018, 08:02 AM
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Turbo Tony Turbo Tony is offline
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Quote:
Originally Posted by Conan_the_Librarian View Post
When I did one of my advance driver course with an ex Met Police examiner we discussed tyre pressure in non standard tyre and wheel combinations.
His recommendation is to set up at a datum (say 34 in your case); then drive the car the manner you intend (urban, motorway, track) and once the tyres are at operating temperature measure them again. You are looking for an increase of 10%. If it's higher than 10% then the tyres were under inflated when cold. Under 10% then they were originally over inflated. It's all about sidewall flexing. Of course it also depends on the manner in which the car is being driven. There are no, one pressure suits all occasions.
Neat tip!
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Old 26th March 2018, 10:11 AM
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Architex_mA8tey Architex_mA8tey is offline
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I generally ran my Kahn Wheels which were 21" at between 38 & 40 psi and that seemed to work well. fronts were 255 30 21 and rears were 295 25 21
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Old 26th March 2018, 11:40 AM
paulrstaylor paulrstaylor is offline
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Quote:
Originally Posted by paulrstaylor View Post
36-38 front, 32-39 rear......

I should have mentioned, this picture is of the OEM pressures sticker from a 2015 D4, which shows the recommended pressures for this size of tyre.....

It also has a part number, should you want to order one for your own door
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Old 28th March 2018, 09:57 AM
GlynH GlynH is offline
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Thanks for taking the time to reply guys...Iíve learned a lot.

And Iíve ordered a new door sticker from Audi for the bargain price of £4.57.

Probably the cheapest thing Iíve ever brought from Audi

-=Glyn=-
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