Avant Quattro 19" Tire Load Rating ?
04-29-2008, 10:46 AM
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Avant Quattro 19" Tire Load Rating ?
I'm seeing conflicting information about the load rating I'd need for 235/35ZR19 tires for an Avant Quattro. On <a href="http://en.wikipedia.org/wiki/Audi_RS6#Tyres_and_wheels">this wiki page about the RS6</a> it states that the 19"s have trouble achieving a safe load rating. I don't expect my car to be much lighter than an RS6 Avant, especially when I narrow the gap by putting 19" RS6 wheels on it.
The company I'm looking to buy my wheels from said the following just now:
<font color="red">No problem, the wheels are for min. 650 kg. Normaly we use 235/35ZR19 91 for the A6 Type 4B.</font>
Looking up <a href="http://en.wikipedia.org/wiki/Tire_code">in this wikipedia tire load rating table</a> that seems low considering when I STFA I found people with sedan A6's talking about their 96 load rated tires. Should I ask them to put higher rated tires on ? Or am I way off base ?
Are they trying to offload tires that aren't up to the job of carrying an Avant Quattro with RS6 19" wheels on it ?
The company I'm looking to buy my wheels from said the following just now:
<font color="red">No problem, the wheels are for min. 650 kg. Normaly we use 235/35ZR19 91 for the A6 Type 4B.</font>
Looking up <a href="http://en.wikipedia.org/wiki/Tire_code">in this wikipedia tire load rating table</a> that seems low considering when I STFA I found people with sedan A6's talking about their 96 load rated tires. Should I ask them to put higher rated tires on ? Or am I way off base ?
Are they trying to offload tires that aren't up to the job of carrying an Avant Quattro with RS6 19" wheels on it ?
04-29-2008, 11:44 AM
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You should make sure that your tires have a load rating that is at least equal to or greater than
gross vehicle load rating as stated on your car.
My A6 sedan states 2712 lbs front and 2535 lbs rear. So each front tire should have rating of at least 1356 lbs and rear equal to or greater than 1268 lbs. Check yours for similar (higher with Avant) info.
Below is a link to tire load ratings for your info.
As you can see from the table, I need at least 91 load rating on front and 89 on rear. Since tires are usually bought with same load rating, I need 91 minimum.
You can also make sure the wheels are ok.
Hope this helps<ul><li><a href="http://www.tirerack.com/a.jsp?a=AR4&url=%2Ftires%2Ftiretech%2Ftechpage.jsp %3Ftechid%3D35">tire load rating table</a></li></ul>
My A6 sedan states 2712 lbs front and 2535 lbs rear. So each front tire should have rating of at least 1356 lbs and rear equal to or greater than 1268 lbs. Check yours for similar (higher with Avant) info.
Below is a link to tire load ratings for your info.
As you can see from the table, I need at least 91 load rating on front and 89 on rear. Since tires are usually bought with same load rating, I need 91 minimum.
You can also make sure the wheels are ok.
Hope this helps<ul><li><a href="http://www.tirerack.com/a.jsp?a=AR4&url=%2Ftires%2Ftiretech%2Ftechpage.jsp %3Ftechid%3D35">tire load rating table</a></li></ul>
04-29-2008, 12:11 PM
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OK, just looked at my car documents, 91 is correct, should I go higher ?
My documents say 1230KG (2712 pounds) for the front, and 1200KG (2646 pounds) for the rear.
So that's 615KG (1356 pounds) per wheel front and 600KG (1323 pounds) per wheel rear.
According to that link you gave, that means I need Load Index 91 at the front and 90 at the rear.
So this wheel guy is correct, 91 is right on the money. Does anyone think it's worth uprating to a higher number to have some extra safety? I only expect I'd need it with 4 adults and a chunk of weight in the back too.
The numbers I've found in my car docs show that the car weight is 1835KG (although I think that's dry weight, i.e. no oil, fuel, passengers). So let's say it's 2000KG fully loaded for an average day (not carrying any kind of load). That's still way short of the maximum axle loads that the 91 rating are providing me.
So that's 615KG (1356 pounds) per wheel front and 600KG (1323 pounds) per wheel rear.
According to that link you gave, that means I need Load Index 91 at the front and 90 at the rear.
So this wheel guy is correct, 91 is right on the money. Does anyone think it's worth uprating to a higher number to have some extra safety? I only expect I'd need it with 4 adults and a chunk of weight in the back too.
The numbers I've found in my car docs show that the car weight is 1835KG (although I think that's dry weight, i.e. no oil, fuel, passengers). So let's say it's 2000KG fully loaded for an average day (not carrying any kind of load). That's still way short of the maximum axle loads that the 91 rating are providing me.
04-29-2008, 12:48 PM
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91 is too low IMNSHO for areas with potholes
91 will support the car safely. yes.
But if you hit potholes or other major road surface issues, a larger volume tire with more air pressure will provide far more cushion before the sidewall collapses, the rim hits the road, and the inner lip ( at least) bends.
I have concluded that 94 is the lowest I wish to go, and I prefer the 95LR winters and 97LR summers (both 16s) I run now on my S6.
The issue is worst with fat-pig nose heavy cars (like ours) with particularly stiff springs (like mine or anyone with lowered sport springs), or with immovable welded-style shocks (joke, hold the helpful posts)
Grant
aka the curmudgeon on balloon tires
ps: my 245/50-16 F1 GSD3 balloons handle great!
But if you hit potholes or other major road surface issues, a larger volume tire with more air pressure will provide far more cushion before the sidewall collapses, the rim hits the road, and the inner lip ( at least) bends.
I have concluded that 94 is the lowest I wish to go, and I prefer the 95LR winters and 97LR summers (both 16s) I run now on my S6.
The issue is worst with fat-pig nose heavy cars (like ours) with particularly stiff springs (like mine or anyone with lowered sport springs), or with immovable welded-style shocks (joke, hold the helpful posts)
Grant
aka the curmudgeon on balloon tires
ps: my 245/50-16 F1 GSD3 balloons handle great!
04-29-2008, 01:58 PM
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Great. Potholes are very rare round my way. I just noticed my summer 17's and winter 16's are all 91
Considering my springs aren't stiff, and potholes are very rare, I think I'll accept the 91's 
Right then, ordering those RS6 19"s tomorrow :-)
Right then, ordering those RS6 19"s tomorrow :-)
04-29-2008, 04:14 PM
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91 is too low! I had sidewalls rated 91 and they died
a lot I hat to buy 2 new wheels but got 3 tires covered under their warranty. My new set of tires are Falken's 452 245/35/19. They give me a little more sidewall and better ride
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04-30-2008, 02:36 AM
#8
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I fitted Dunlop 235/40/18's with a rating 95Y and treadwear of 280. The higher the better on both...
really is the best option.
If you take the car at roughly 2000kg then say the unloaded weight split is about 60/40 to the front then that would equate to about 600kg per front wheel and about 400kg per rear. If you add a load and passengers then most of that will beb carried by the rear but it still means the 91Y are very close to their designed limit and I would not be comfortable with that. certainly not at German autobahn speeds!
If you take the car at roughly 2000kg then say the unloaded weight split is about 60/40 to the front then that would equate to about 600kg per front wheel and about 400kg per rear. If you add a load and passengers then most of that will beb carried by the rear but it still means the 91Y are very close to their designed limit and I would not be comfortable with that. certainly not at German autobahn speeds!