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If Conti Extreme Contacts are vail in that size, they are VERY impressive. On par with Michelin PSS/PS4 for MUCH less. Rain is their strength. On my Miata now and Wow what an upgrade v the excellent Bridgestone RE050 stock tires. Remember these were Ferrari quality in their day!!
 
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As I´m on exchanging the rear wheels to 285.
Opinions?

Pirelli P Zero SC - 285/40 R20 104Y AR

or

Michelin Latitude Sport 3 - 285/40 ZR20 108Y

Thank you! :grin

Flavio
Flavio... wondering what you found in your research? I'm also adding the Quad Wheels.

I know I should be buying 285/40/20 Rear and 255/45/20 Fronts. They both equal 29.1" in Diameter so its a perfect match.

However I wanted to go a little taller for more comfort. My supplier suggested another equal match at 275/545/20 Rears and 255/50/20 Fronts. And there are SO MANY more options too. The Diameter is 30.0" so an extra inch taller. From my calculations I will get 5mm more inner clearance in the front but lose 8mm clearance in the rear... so I'm wondering if that extra (1/2 inch) is going to be problematic in the rear. My gut says no after putting wheels on so many cars.
 

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Discussion Starter #6
Flavio... wondering what you found in your research? I'm also adding the Quad Wheels.

I know I should be buying 285/40/20 Rear and 255/45/20 Fronts. They both equal 29.1" in Diameter so its a perfect match.

However I wanted to go a little taller for more comfort. My supplier suggested another equal match at 275/545/20 Rears and 255/50/20 Fronts. And there are SO MANY more options too. The Diameter is 30.0" so an extra inch taller. From my calculations I will get 5mm more inner clearance in the front but lose 8mm clearance in the rear... so I'm wondering if that extra (1/2 inch) is going to be problematic in the rear. My gut says no after putting wheels on so many cars.
Well.. I will try to resume my research.

1st.. 285/40/20 Rear and 255/45/20 Front... are same diameter... no need recoding for Speedmeter calibration.



I choose to have wider stance and look at the rear. The Quad is 10" wide rear.. and 9" at front.
For you to use the original 255/45/20 that come in the 20" factory wheel.. and re-use them on the Quad wheels.. only buy front wheels. (buy 4 front wheels)
If you want the "that ass" look.. at rear.. and some how.. better handling.. choose Front and rear wheels and use 285/40/20 Rear and 255/45/20 Front.

I made the choice to use exactly like quad. Staggered wheels.
I only buy rear tires (Pirelli Zero with AR certified) and used the Michelin Latitude Sport 3 that came factory at the front..
Later I will buy Pirelli for front and rear.
I sale the other 2 new tires to a friend.

I never rode with the factory wheels and tires. I exchange the quad wheel directly at day one delivery picked up the car.
I kept the silver factory 20" in my garage... maybe sale them later.

The Quad wheel.. are plug and play.. no rubbing nowhere.
I consider to fit spacer 15mm only at rear.. to pullout a little bit the wheel align to the quad fender flare arch.
In my opinion.. the Quad wheel.. would be perfect if not fitting the Quad fender flare arch.
I guess that the Quad wheel hub is more outside than the "regular" Stelvio.

I know that @Alfaspider insert 20mm spacer.
check it here: https://www.stelvioforum.com/forum/137-alfa-romeo-stelvio-owners-registry-check-area/8133-ordered-misano-blue-stelvio.html

check mine where you can see that the wheel is inside the fender.
https://www.stelvioforum.com/forum/271-stelvio-projects/8455-stelvio-diesel-project-qv-edizione-8.html

Hope that I answered all your doubt and help you with my experience on this matters.
If not feel free to ask again or more doubts.

:grin Flavio
 

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Well.. I will try to resume my research.

1st.. 285/40/20 Rear and 255/45/20 Front... are same diameter... no need recoding for Speedmeter calibration.



I choose to have wider stance and look at the rear. The Quad is 10" wide rear.. and 9" at front.
For you to use the original 255/45/20 that come in the 20" factory wheel.. and re-use them on the Quad wheels.. only buy front wheels. (buy 4 front wheels)
If you want the "that ass" look.. at rear.. and some how.. better handling.. choose Front and rear wheels and use 285/40/20 Rear and 255/45/20 Front.

I made the choice to use exactly like quad. Staggered wheels.
I only buy rear tires (Pirelli Zero with AR certified) and used the Michelin Latitude Sport 3 that came factory at the front..
Later I will buy Pirelli for front and rear.
I sale the other 2 new tires to a friend.

I never rode with the factory wheels and tires. I exchange the quad wheel directly at day one delivery picked up the car.
I kept the silver factory 20" in my garage... maybe sale them later.

The Quad wheel.. are plug and play.. no rubbing nowhere.
I consider to fit spacer 15mm only at rear.. to pullout a little bit the wheel align to the quad fender flare arch.
In my opinion.. the Quad wheel.. would be perfect if not fitting the Quad fender flare arch.
I guess that the Quad wheel hub is more outside than the "regular" Stelvio.

I know that @Alfaspider insert 20mm spacer.
check it here: https://www.stelvioforum.com/forum/137-alfa-romeo-stelvio-owners-registry-check-area/8133-ordered-misano-blue-stelvio.html

check mine where you can see that the wheel is inside the fender.
https://www.stelvioforum.com/forum/271-stelvio-projects/8455-stelvio-diesel-project-qv-edizione-8.html

Hope that I answered all your doubt and help you with my experience on this matters.
If not feel free to ask again or more doubts.

:grin Flavio
Flavio, Thank you as always.

The problem with the US cars is that we are given the Continental CROSSCONTACT LX SPORT SIZE: 255/45R20

I thought about re-using the front tires myself but they don't make the CrossContact in 285/40/20. The tires are All-Season Grand Touring so finding the proper match for the rear is troublesome since there are only about 5 different models of tires in that size.

Yes because of Alfaspider I just ordered the H&R 20mm spacers for the rear. Wheels should be here next week around Thursday. The spacers should be here Tuesday.

So now I am still shopping for tires. Like I mentioned, my tire supplier specialist mentioned upsizing the height because there are about 20 different model combinations I can choose from at that size PLUS I will get the benefit of have 1" more of tire which will make the ride more comfortable. I think I may get the Michelin Premier tires. 275/45R20 110V XL 660 Tread depth and 255/50R20 109V XL 660 Tread Depth.
 

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Discussion Starter #8
Flavio, Thank you as always.

The problem with the US cars is that we are given the Continental CROSSCONTACT LX SPORT SIZE: 255/45R20

I thought about re-using the front tires myself but they don't make the CrossContact in 285/40/20. The tires are All-Season Grand Touring so finding the proper match for the rear is troublesome since there are only about 5 different models of tires in that size.

Yes because of Alfaspider I just ordered the H&R 20mm spacers for the rear. Wheels should be here next week around Thursday. The spacers should be here Tuesday.

So now I am still shopping for tires. Like I mentioned, my tire supplier specialist mentioned upsizing the height because there are about 20 different model combinations I can choose from at that size PLUS I will get the benefit of have 1" more of tire which will make the ride more comfortable. I think I may get the Michelin Premier tires. 275/45R20 110V XL 660 Tread depth and 255/50R20 109V XL 660 Tread Depth.
Try here.

https://tiresize.com/tyre-size-calculator/
to compare...

I´m using diferent tires in each axle.
Front the tires that came factory... the Michelin Latitude Sport 3
and I only bought new rear set of tires. The Pirelli in 285.
Here in Portugal the police if they have a suspect that there is something wrong they will check on the ownership legal paper of the stelvio and see if the tires you are using in the car are approved.
Here officialy Alfa only approved 285 in the Quad.
So.. I´m an outlaw.. right now...
I will seek for a change on that paper to be 100% legal.
mentioning that I am using sizes used on on other Stelvio´s...
Changing for any other sizes.. here in Portugal.. would be almost impossible to get it approved.

Don´t forget to check if it does change the rotation because of Speed mark on the dashboard.

:wink

I made you some comparison... for you to think better about it.



 

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Try here.

https://tiresize.com/tyre-size-calculator/
to compare...

I´m using diferent tires in each axle.
Front the tires that came factory... the Michelin Latitude Sport 3
and I only bought new rear set of tires. The Pirelli in 285.
Here in Portugal the police if they have a suspect that there is something wrong they will check on the ownership legal paper of the stelvio and see if the tires you are using in the car are approved.
Here officialy Alfa only approved 285 in the Quad.
So.. I´m an outlaw.. right now...
I will seek for a change on that paper to be 100% legal.
mentioning that I am using sizes used on on other Stelvio´s...
Changing for any other sizes.. here in Portugal.. would be almost impossible to get it approved.

Don´t forget to check if it does change the rotation because of Speed mark on the dashboard.

:wink

I made you some comparison... for you to think better about it.
Once again, thank you very much. I also wanted to swap the rear but this CrossContactXL tire really doesn't have a great match for what is available at 285/40/20.

Nitto NT 420S
Pirelli Winter Scorpion
Goodyear Eagle Sport AS Run-Flat Design EMT
Goodyear Eagle RS-A Run-Flat Design EMT
Dunlop Sport MAXX RT2
Michelin Latitude Sport 3
Pirelli P-Zero PZ4
 

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Discussion Starter #10
Once again, thank you very much. I also wanted to swap the rear but this CrossContactXL tire really doesn't have a great match for what is available at 285/40/20.

Nitto NT 420S
Pirelli Winter Scorpion
Goodyear Eagle Sport AS Run-Flat Design EMT
Goodyear Eagle RS-A Run-Flat Design EMT
Dunlop Sport MAXX RT2
Michelin Latitude Sport 3
Pirelli P-Zero PZ4
I choose... "Pirelli P Zero SC - 285/40 R20 104Y AR" for the rear.
I kept the Michelin Latitude Sport 3 (that came from factory for the front axle in 255/45R20)
And then put all the same "Pirelli" on the next tires exchange.

:grin Flavio
 

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So you have fit a 285/40R20 on the rear of a your diesel? But did you use stock fender flares or Quad flares? You also needed spacers to make the rears fit, correct. Under compression, how close are you to rubbing the fender flares depending on what you installed? There seems to be 1 too many variable at play here hehe. But the front fit fine with no mods??
 
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Discussion Starter #12
So you have fit a 285/40R20 on the rear of a your diesel? But did you use stock fender flares or Quad flares? You also needed spacers to make the rears fit, correct. Under compression, how close are you to rubbing the fender flares depending on what you installed? There seems to be 1 too many variable at play here hehe. But the front fit fine with no mods??
With Quad wheels on a non quad:
Front fits fine.. with or without oem Quad flares
Rear fits fine with 285.

Variable:
- with rear quad wheels and oem non quad flares - is perfect no spacers need.
- with rear quad wheels and oem quad flares - fits ok, but for me need spacers(15/20mm) to be align with fender flare.

with OEM no lowered kit spring.. no rubbing anywhere. (inside or outside)

With other wheels and offset/ET .. can´t answer.

Hope that I helped.

Flavio
 

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Thanks! So everything fits fine as I intend to leave all else alone. What was the weight increase going from stock to the rear quad setup on each corner? It is the additional unsprung weight that can slow the car down that still concerns me. If its 10 lbs that is easily like losing 10-20hp when it comes to unsprung weight. Enemy #1 on a vehicle.
 
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"easily like losing 10-20 hp"

it's not that the weight is unsprung, it's because it is rotational mass.
to a lesser extent you lose on aerodynamics too, so fuel economy and acceleration take a hit - but I doubt 10 pounds equates to 10-20 hp on a large vehicle - if it did manufacturers would have been mounting skinnies all around on everything for ever.
and my old GTV with 205s in place of the stock 165s would have been a very slow car.
 

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Thanks everyone. The ironic thing about weights is those Contis can be anywhere from 27-31lbs.....same weight as the 285/40R20 Pirelli PZ4's. I pulled the trigger in the set that are new quad wheels with PZ4's because the tires add up to like $1448 and the wheels are supposedly ~1300 each!! for 6648!!! Shipped I shhttps://www.stelvioforum.com/forum/newreply.php?do=newreply&noquote=1&p=98003ould pay ~$1950!!
I can't buy 18's and snows for that amount unless it is some junk wheel because TR has no fitments for Stelvio yet. It was going to run me ~1400 for some 18in Alfa OEs shipped + snows for ~2100+ M&B + TPMS.... probably closer to~$ 2350. This was too good to pass up!!! Never cease to be amazed at some of the stuff I find on Ebay
 

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Thanks everyone. The ironic thing about weights is those Contis can be anywhere from 27-31lbs.....same weight as the 285/40R20 Pirelli PZ4's. I pulled the trigger in the set that are new quad wheels with PZ4's because the tires add up to like $1448 and the wheels are supposedly ~1300 each!! for 6648!!! Shipped I shhttps://www.stelvioforum.com/forum/newreply.php?do=newreply&noquote=1&p=98003ould pay ~$1950!!
I can't buy 18's and snows for that amount unless it is some junk wheel because TR has no fitments for Stelvio yet. It was going to run me ~1400 for some 18in Alfa OEs shipped + snows for ~2100+ M&B + TPMS.... probably closer to~$ 2350. This was too good to pass up!!! Never cease to be amazed at some of the stuff I find on Ebay
Those Italians selling that good good. That is indeed a ridiculous deal. I almost bought it but I just don't like the P-Zeros. Have had bad experiences with them. In any case... very excited for you. If you don't get the Quad extensions, the Quad wheels will fit like a **** glove. No need for anything additional. :devil
 

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"easily like losing 10-20 hp"

it's not that the weight is unsprung, it's because it is rotational mass.
to a lesser extent you lose on aerodynamics too, so fuel economy and acceleration take a hit - but I doubt 10 pounds equates to 10-20 hp on a large vehicle - if it did manufacturers would have been mounting skinnies all around on everything for ever.
and my old GTV with 205s in place of the stock 165s would have been a very slow car.
When my new spacers come in I will take off the rear wheels and weigh them with the tires and all. I will say that the actual Quadrifoglio wheels are very light. But so are the stock 20" wheels. The front Quad wheels felt lighter than the stocks and the rear were a bit heavier than the stocks. The biggest weight difference will be between the original 255/45/20 with wheels mounted and Quad 285/40/20 with wheels mounted. I could feel the bit of weight instantly but the bulldog stance was so noticeably planted, the weight is not much. It has to have given up a little bit of performance but not much and easily worth the sacrifice of the wider track pad.

...................................

Check the comparison below:

The 255/45R20 Continental CrossContact LX Sport has a diameter of 29", a width of 10", mounts on a 20" rim and has 716 revolutions per mile. It weighs 32 lbs, has a max load of 1819 lbs, a maximum air pressure of 51 psi, a tread depth of 10/32" and should be used on a rim width of 8-9.5".

The 285/40R20 Pirelli P Zero has a diameter of 29", a width of 11.2", mounts on a 20" rim and has 716 revolutions per mile. It weighs 33 lbs, has a max load of 1984 lbs, a maximum air pressure of 51 psi, a tread depth of 10/32" and should be used on a rim width of 9.5-11".
 

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Do yourself a favor and order these. Thank me later. :)

https://www.ebay.com/itm/232911545846

Might you be suggesting to me that the TPMS for Euro cars is different than for our fitment? The setup I ordered was OE takeoff and TPMS sensors were installed from the pics I saw.


As far as acceleration is concerned, I expect to recover that with the tune!!
 
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Might you be suggesting to me that the TPMS for Euro cars is different than for our fitment? The setup I ordered was OE takeoff and TPMS sensors were installed from the pics I saw.


As far as acceleration is concerned, I expect to recover that with the tune!!
No. They should work no problem. I wasn't being specific to your situation. Your setup is ready to mount and GO!
 
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