Replacement tires for my summer tires
02-29-2012, 01:57 AM
#11
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Here is a good site for calculating the difference in speedo readings for OEM and different size tyres:
http://www.miata.net/garage/tirecalc.html
http://www.miata.net/garage/tirecalc.html
02-29-2012, 05:59 AM
#12
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My 2010 A8 3.0tdi D4 running 20" wheels now needs new tyres at 22k miles.
Before this car, I had a D3 on 19" wheels for 136k miles, and having tried multiple brands of tyre felt that the Bridgestone RE04 was the best for quietness and comfort. I am less concerned about outright performance.
The D4 car was delivered with 265/40/20 Pirelli PZero. The tyre was a total disaster. Noisy, uncomfortable and plain dangerous in snow/ice. My dealer responded brilliantly to my complaints and changed the tyres for Goodyear Eagle F1 at 1k miles foc. The car was much improved, but still not as quiet as I would expect. I would rather have something else this time, although of the 2 choices the Goodyear wins hands down.
The PZero and F1s are the only tyres that Audi currently fits as OEM, so it is impossible to drive a dealer forecourt car for other comparisons . The only other car (not SUV) tyre available in that size is a Continental Contisport2. Generally that tyre (not in 265/40/20 necessarily) gets poor reviews for wear and wet weather grip. I cannot find any forums comments from a D4 owner as to how that tyre compares with the PZero or F1. Anyone help please?
I have considered going to 275/40/20 for more options, but my Audi technician (whom I trust absolutely) told me that "the car knows what size tyres it is supposed to have" and that changing the size would screw up all the predictive stuff the car does (changing down into corners based on satnav data etc).
So I looked at all the factory tyre and wheel options and found that none of the 18", 19", 20" or 21" OEM rolling radii are actually the same.
18" with 235/55/18 has an rr of 716mm
19" with 255/45/19 has an rr of 712mm
20" with 265/40/20 has an rr of 720mm
21" with 275/35/21 has an rr of 726mm
20" with 275/40/20 would have an rr of 728mm so barely different from a 20" or 21" that was a pound or two over or under-inflated.
I went back to my Audi guy and again he told me "no matter - the car knows what wheel and tyre combination it is supposed to have (set at the factory)" and that changing the size would screw up all the predictive stuff the car does.
So, I am reluctant to go against the advice of Audi as it would be my luck to get an expensive powertrain problem and for it to be blamed on the tyres.
Help!!
Before this car, I had a D3 on 19" wheels for 136k miles, and having tried multiple brands of tyre felt that the Bridgestone RE04 was the best for quietness and comfort. I am less concerned about outright performance.
The D4 car was delivered with 265/40/20 Pirelli PZero. The tyre was a total disaster. Noisy, uncomfortable and plain dangerous in snow/ice. My dealer responded brilliantly to my complaints and changed the tyres for Goodyear Eagle F1 at 1k miles foc. The car was much improved, but still not as quiet as I would expect. I would rather have something else this time, although of the 2 choices the Goodyear wins hands down.
The PZero and F1s are the only tyres that Audi currently fits as OEM, so it is impossible to drive a dealer forecourt car for other comparisons . The only other car (not SUV) tyre available in that size is a Continental Contisport2. Generally that tyre (not in 265/40/20 necessarily) gets poor reviews for wear and wet weather grip. I cannot find any forums comments from a D4 owner as to how that tyre compares with the PZero or F1. Anyone help please?
I have considered going to 275/40/20 for more options, but my Audi technician (whom I trust absolutely) told me that "the car knows what size tyres it is supposed to have" and that changing the size would screw up all the predictive stuff the car does (changing down into corners based on satnav data etc).
So I looked at all the factory tyre and wheel options and found that none of the 18", 19", 20" or 21" OEM rolling radii are actually the same.
18" with 235/55/18 has an rr of 716mm
19" with 255/45/19 has an rr of 712mm
20" with 265/40/20 has an rr of 720mm
21" with 275/35/21 has an rr of 726mm
20" with 275/40/20 would have an rr of 728mm so barely different from a 20" or 21" that was a pound or two over or under-inflated.
I went back to my Audi guy and again he told me "no matter - the car knows what wheel and tyre combination it is supposed to have (set at the factory)" and that changing the size would screw up all the predictive stuff the car does.
So, I am reluctant to go against the advice of Audi as it would be my luck to get an expensive powertrain problem and for it to be blamed on the tyres.
Help!!
09-12-2015, 07:43 AM
#13
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I'm facing the exact same problem ,and arriving to the exact same choices ... Have you had any issues with 275 40r20? I'm bouncing between 40 and 35 sidewall decision and would prefer a softer ride of 40s ... If they fit.
09-12-2015, 06:24 PM
#14
AudiWorld Member
I've been running 275/40/20 for 20,000 miles with no problems. They are only wider than the factory 265's. The 275's are supposed to be .2" taller than the 265 but I sure don't see it when they are both mounted, aired up and sitting side by side. Myself I wouldn't even think of going to a 35 profile tire.
The 275's look so much better when on the car. When I put my 265's back on they look so narrow and wimpy.
09-12-2015, 07:10 PM
#15
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You must have gone WAY back to revive this old thread!
I've been running 275/40/20 for 20,000 miles with no problems. They are only wider than the factory 265's. The 275's are supposed to be .2" taller than the 265 but I sure don't see it when they are both mounted, aired up and sitting side by side. Myself I wouldn't even think of going to a 35 profile tire.
The 275's look so much better when on the car. When I put my 265's back on they look so narrow and wimpy.
I've been running 275/40/20 for 20,000 miles with no problems. They are only wider than the factory 265's. The 275's are supposed to be .2" taller than the 265 but I sure don't see it when they are both mounted, aired up and sitting side by side. Myself I wouldn't even think of going to a 35 profile tire.
The 275's look so much better when on the car. When I put my 265's back on they look so narrow and wimpy.
I think I will go with the same setup as yours. For hers that might read this:Tire rack suggested 275 40, the dealer was unsure of 40, but was very comfortable with 35s ; also, I explicitly asked the dealer if speedometer would need to be adjusted : "no, the change is insignificant" was the reply.
Also, I'm running 235 50r19 winter sports for snow / ice weather -- works great; much better than all seasons
09-13-2015, 06:02 AM
#16
AudiWorld Member
The 35 profile 275 tire is shorter than a stock 265/40/20 by a whole lot more than a 275/40/20 is taller. A 275/35/20 is .6" shorter than stock.
And honestly, either one will not affect the electronics in the car at all as long as you have the same size on all four corners.
I have one dealer that is totally against me running the 275 or non stock size. They think it is going to mess with the electronics or something like the adaptive cruise or pre-sense stuff. Its only 4 less revolutions per mile using the 275/40/20 vs the 265/40/20 according to the Tire Rack specs! The car isn't going to know the difference there!
And honestly, either one will not affect the electronics in the car at all as long as you have the same size on all four corners.
I have one dealer that is totally against me running the 275 or non stock size. They think it is going to mess with the electronics or something like the adaptive cruise or pre-sense stuff. Its only 4 less revolutions per mile using the 275/40/20 vs the 265/40/20 according to the Tire Rack specs! The car isn't going to know the difference there!
09-13-2015, 10:54 AM
#17
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The 35 profile 275 tire is shorter than a stock 265/40/20 by a whole lot more than a 275/40/20 is taller. A 275/35/20 is .6" shorter than stock.
And honestly, either one will not affect the electronics in the car at all as long as you have the same size on all four corners.
I have one dealer that is totally against me running the 275 or non stock size. They think it is going to mess with the electronics or something like the adaptive cruise or pre-sense stuff. Its only 4 less revolutions per mile using the 275/40/20 vs the 265/40/20 according to the Tire Rack specs! The car isn't going to know the difference there!
And honestly, either one will not affect the electronics in the car at all as long as you have the same size on all four corners.
I have one dealer that is totally against me running the 275 or non stock size. They think it is going to mess with the electronics or something like the adaptive cruise or pre-sense stuff. Its only 4 less revolutions per mile using the 275/40/20 vs the 265/40/20 according to the Tire Rack specs! The car isn't going to know the difference there!
09-13-2015, 12:49 PM
#18
AudiWorld Member
My 2010 A8 3.0tdi D4 running 20" wheels now needs new tyres at 22k miles.
Before this car, I had a D3 on 19" wheels for 136k miles, and having tried multiple brands of tyre felt that the Bridgestone RE04 was the best for quietness and comfort. I am less concerned about outright performance.
The D4 car was delivered with 265/40/20 Pirelli PZero. The tyre was a total disaster. Noisy, uncomfortable and plain dangerous in snow/ice. My dealer responded brilliantly to my complaints and changed the tyres for Goodyear Eagle F1 at 1k miles foc. The car was much improved, but still not as quiet as I would expect. I would rather have something else this time, although of the 2 choices the Goodyear wins hands down.
The PZero and F1s are the only tyres that Audi currently fits as OEM, so it is impossible to drive a dealer forecourt car for other comparisons . The only other car (not SUV) tyre available in that size is a Continental Contisport2. Generally that tyre (not in 265/40/20 necessarily) gets poor reviews for wear and wet weather grip. I cannot find any forums comments from a D4 owner as to how that tyre compares with the PZero or F1. Anyone help please?
I have considered going to 275/40/20 for more options, but my Audi technician (whom I trust absolutely) told me that "the car knows what size tyres it is supposed to have" and that changing the size would screw up all the predictive stuff the car does (changing down into corners based on satnav data etc).
So I looked at all the factory tyre and wheel options and found that none of the 18", 19", 20" or 21" OEM rolling radii are actually the same.
18" with 235/55/18 has an rr of 716mm
19" with 255/45/19 has an rr of 712mm
20" with 265/40/20 has an rr of 720mm
21" with 275/35/21 has an rr of 726mm
20" with 275/40/20 would have an rr of 728mm so barely different from a 20" or 21" that was a pound or two over or under-inflated.
I went back to my Audi guy and again he told me "no matter - the car knows what wheel and tyre combination it is supposed to have (set at the factory)" and that changing the size would screw up all the predictive stuff the car does.
So, I am reluctant to go against the advice of Audi as it would be my luck to get an expensive powertrain problem and for it to be blamed on the tyres.
Help!!
Before this car, I had a D3 on 19" wheels for 136k miles, and having tried multiple brands of tyre felt that the Bridgestone RE04 was the best for quietness and comfort. I am less concerned about outright performance.
The D4 car was delivered with 265/40/20 Pirelli PZero. The tyre was a total disaster. Noisy, uncomfortable and plain dangerous in snow/ice. My dealer responded brilliantly to my complaints and changed the tyres for Goodyear Eagle F1 at 1k miles foc. The car was much improved, but still not as quiet as I would expect. I would rather have something else this time, although of the 2 choices the Goodyear wins hands down.
The PZero and F1s are the only tyres that Audi currently fits as OEM, so it is impossible to drive a dealer forecourt car for other comparisons . The only other car (not SUV) tyre available in that size is a Continental Contisport2. Generally that tyre (not in 265/40/20 necessarily) gets poor reviews for wear and wet weather grip. I cannot find any forums comments from a D4 owner as to how that tyre compares with the PZero or F1. Anyone help please?
I have considered going to 275/40/20 for more options, but my Audi technician (whom I trust absolutely) told me that "the car knows what size tyres it is supposed to have" and that changing the size would screw up all the predictive stuff the car does (changing down into corners based on satnav data etc).
So I looked at all the factory tyre and wheel options and found that none of the 18", 19", 20" or 21" OEM rolling radii are actually the same.
18" with 235/55/18 has an rr of 716mm
19" with 255/45/19 has an rr of 712mm
20" with 265/40/20 has an rr of 720mm
21" with 275/35/21 has an rr of 726mm
20" with 275/40/20 would have an rr of 728mm so barely different from a 20" or 21" that was a pound or two over or under-inflated.
I went back to my Audi guy and again he told me "no matter - the car knows what wheel and tyre combination it is supposed to have (set at the factory)" and that changing the size would screw up all the predictive stuff the car does.
So, I am reluctant to go against the advice of Audi as it would be my luck to get an expensive powertrain problem and for it to be blamed on the tyres.
Help!!
Ok, let's look at this another way.
If your dealer is saying that a tire with .2 of an inch difference will mess with the electronics, how does one deal with a tire getting smaller as it wears out?
With a tread depth of 10 32nds of an inch and a discard at 2 32nds you'll decrease the diameter of the tire by 8 32nds , which is slightly more than .2 of an inch?
Last edited by andrewmr; 09-13-2015 at 01:20 PM.
10-29-2015, 08:50 PM
#19
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275/40 r20 on 2013 a8l are too close to the steering arms. The gap with 265/40 20 is 10mm , a wider tire will shrink this clearance to 6mm. I ended up RMAing these in favor of 35 aspect ratio. These fit perfectly
10-30-2015, 10:34 AM
#20
AudiWorld Member
Been running 275/40/20's in two different brands for just over 30,000 miles now and does not come too close to hitting anything anywhere and fit perfectly.
And I don know what RMAing means.