Tyre Pressures

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Jackson_a3

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Hi guys,

After experiences and opinions - put some 18x8 wheels on my A4 Quattro saloon, 225 40 18.

What sort of pressures should I be running / do you use? The info inside the door only states pressures for 17s.

Cheers in advance
Jackson
 
I run 235/40x18 on 8x18 wheels, and have them set at 37psi all round (cold), but mine's a 3.0TDi, so it carries a lot of weight over the front. What engine do you have?
 
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I also run 235/40x18 on 8x18 wheels, with a 2.0TDI. They recommend 35psi all-round. I would say the petrol version won't be too different.
 
I have 235 40 r18 XL on my A4 2.0 TDI, and with not exceeding more than 2 passengers at any time, I have 32psi running all around.
 
I'd say around 39-45 psi for yours, I'm running 60 psi on 19's bit silly and mental but this started as an accident, was left due to laziness and now stays as the car has been fine for around 6 months with it.
 
32 psi as the tyre profile won't make a difference. Over inflation will wear the middle of the tyre and under inflation will wear the outer edges. Over inflation when cold can cause blow outs when running long journeys due to heat. Although this is rare I personally would have no more that 32 psi when cold which allows fir expansion.
 
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Nahhh it's economical haha, maybe one day but they've been fine for 6 months :lick: may check them out tomorrow as I should monitor them more often.
 
DieselJake said:
Nahhh it's economical haha, maybe one day but they've been fine for 6 months :lick: may check them out tomorrow as I should monitor them more often.
Click to expand...
You might want to check the safety rating information on the sidewalks of your tyres. I'd very surprised if their maximum pressure rating is that high.
 
No doubt it's over. More worried about not having resistors for bucket seats (air bag light on so air bags will not deploy), buckets could also be classed as a safety hazard if we're being picky they do not contain side airbags, in every incident I've had so far airbags haven't deployed though. People will come back with "omg but what if xyz happens" and there are scenario's where I am more at risk than others with the exact same make and model but even without a couple of safety features the car is still much safer than car's I'm currently considering for a second car.
 
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DieselJake said:
No doubt it's over. More worried about not having resistors for bucket seats (air bag light on so air bags will not deploy), buckets could also be classed as a safety hazard if we're being picky they do not contain side airbags, in every incident I've had so far airbags haven't deployed though. People will come back with "omg but what if xyz happens" and there are scenario's where I am more at risk than others with the exact same make and model but even without a couple of safety features the car is still much safer than car's I'm currently considering for a second car.
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Yes, but if you have a blowout on the motorway and crash into somebody else - or even worse - when your car is inspected, you will be completely liable, and may even have invalidated insurance due to running an unsafe car!
 
Can't inspect tyre pressure when the tyre's exploded. If we're being picky even tyre changes are classed as a modification and have to be declared to insurance so the majority of people have invalidated insurance in the event of a blowout.
 
Should be the same pressure as standard imo, its just a different volume of air.
 
DieselJake said:
Can't inspect tyre pressure when the tyre's exploded. If we're being picky even tyre changes are classed as a modification and have to be declared to insurance so the majority of people have invalidated insurance in the event of a blowout.
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no, but they can look at your remaining tyres, and if all three are 60psi, then they'll use that! and no, tyre changes are not insurance declarable (unless they're street legal racing tyres - but there's some strange rules about those)...however driving a dangerous car can invalidate your insurance!

Im ripping off another site, but: "Increasing your tire pressure to 40 psi is most likely a 25% increase over manufacturers and the DOT's safety specification and it is indeed dangerous." so 60 psi is just stupid...(in my opinion of course)
 
Jake

You're a smart guy; why are you trying so hard to defend something that you know is a bit dim?
 
I know it's a bad idea and wouldn't recommend anyone to follow in my footsteps, did also say it was pumped like this on accident and has remained the same out of laziness.

Jespy said:
tyre changes are not insurance declarable
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Wrong, guys on the Mini forum (and others) have lost insurance claims due to changing from run-flats, same stories occur with winter tyres and others.
 
I very unluckily split the side-wall of my O/S/F tyre on Monday (235 x 40 18 - A4 Avant 3.0TDi Tip quattro)
I spent a while checking various sites and established a pressure of 2.5 bar (36.25 psi) was recommended for the make and size with the load use I have.
I set them all to that pressure and car drives fine.

Rule of thumb in my humble opinion -

Too hard = less grip and more road noise
Too soft = poor handling and increased tyre wear
Correct Pressure = Peace of mind, safe driving with good handling, secure stopping and value for money out of your tyres.

Buy cheap tyres at your peril and check for the correct pressures and condition regularly.
Follow these simple rules and you can't go far wrong.
Nuff said:yahoo:


Marty:blackrs4:
 
DieselJake said:
Wrong, guys on the Mini forum (and others) have lost insurance claims due to changing from run-flats, same stories occur with winter tyres and others.
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That, to be fair, is a change of tyre TYPE, i.e. runflats to non-run-flats, or all round to winter tyres. Simply changing from a Hancook to a Pirelli, Dunlop or Vredestein will not affect your insurance. A4 B7 never came with run flats, so this is applicable here.

I've run a range of pressures from 44 to 36, at the moment I'm running 38 but each time the car is parked the tyre look slightly flat? I'm going to go up to 40-42 next time I fill up where there is free air...
 
jjmurphy21187 said:
That, to be fair, is a change of tyre TYPE, i.e. runflats to non-run-flats, or all round to winter tyres. Simply changing from a Hancook to a Pirelli, Dunlop or Vredestein will not affect your insurance. A4 B7 never came with run flats, so this is applicable here.
Click to expand...

Would recommend you look into this; tyre changes invalidate insurance if new tyres do not meet manufacturer specifications (which in the majority of changes they don't), people don't generally claim for a puncture or blowout but if they did and the car was found to have different tyres then they would not have to pay, same scenario if the blowout resulted in hitting another car etc.
 
To quote jjmurphy21187
"I've run a range of pressures from 44 to 36, at the moment I'm running 38 but each time the car is parked the tyre look slightly flat? I'm going to go up to 40-42 next time I fill up where there is free air..."

I bet they're only flat at the bottom :wtf:
 
DieselJake said:
Would recommend you look into this; tyre changes invalidate insurance if new tyres do not meet manufacturer specifications (which in the majority of changes they don't), people don't generally claim for a puncture or blowout but if they did and the car was found to have different tyres then they would not have to pay, same scenario if the blowout resulted in hitting another car etc.
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I can't believe this is true, 90% of the cars on the road would have invalid insurance. If some tyres are 'up to manufacturer's standards' and others aren't, what are the criteria that Audi set? A lot of people (less keen drivers) don't even know what make/model tyres they have fitted, let along if they are the same as what came from the factory.

martynash said:
I bet they're only flat at the bottom :wtf:
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Yes only flat at the bottom... as they are only slightly flat, i.e. look a little underinflated. Even tyres that are at 5psi don't look 'flat' at the top...
 
If speed rating ever comes into it, you were breaking the speed limit and your insurance could be invalidated anyway...

Most people stick to the same tyres sizes on OEM wheels, all be it not all, but changing your tyre size is a modification, not general maintenance. If you replace your OEM wheels with different sized ones, then there is no OEM recommendation for width/height, therefore as long as they are declared (which they should be anyway otherwise your insurance IS invalid) there is no OEM reference point.

I don't disagree with you that changing tyre type (winter/summer, run-flats/normal) should be declared as this affects how the car handles in extreme conditions, however for changing from say a Pirelli to a Hancook does not need to be declared to your insurance company.

If you can give me an example of an insurance company who hasn't paid our due to a different make of tyre being fitted however, I'll happily eat my words!

(Just to note, I've declared my alloys to my insurance company so I'm safe either way :meeting:)
 
jjmurphy21187 said:
changing your tyre size is a modification, not general maintenance. If you replace your OEM wheels with different sized ones, then there is no OEM recommendation for width/height, therefore as long as they are declared (which they should be anyway otherwise your insurance IS invalid) there is no OEM reference point.
Click to expand...

... yes... which is what I just said.

jjmurphy21187 said:
for changing from say a Pirelli to a Hancook does not need to be declared to your insurance company.
Click to expand...

The link is not brand specific, you do not need to declare brand so long as it meets specifications.

jjmurphy21187 said:
If you can give me an example of an insurance company who hasn't paid our due to a different make of tyre being fitted however, I'll happily eat my words!
Click to expand...

Sure, I'll give an example if you provide 5 examples of people bursting budget tyres and going through insurance for new ones :yes:
 
Exactly, there's your answer, highly unlikely anyone would go through insurance for a tyre.

hEDBC6523
 
Top picture Scanned from my Audi Owners Manual
Bottom picture taken from my door shut

Audi Tyre pressures0002
Audi tyre pressures door shut
 
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Well safe to say I didn't expect the thread to go like this...! Thanks for all the replies and info
 
Ok, I think it's time to stop. Marty and Jake, I have deleted your most recent posts, because they were either inflammatory or inappropriate, or both.
 
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