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For whats its worth my 45 with OEM 19 wheels been on Potenza S007A XL 245/45/19 ($190 each at the time)for a little over a year now. Similar ride quality to OEM tires, rotated once, good tread wear and much more grip in my mountain drives. The added width makes the stance that much nicer.

I went for month looking for a reasonable 20inch wheel to fit some Michelin PS4 but im glad i stayed 19.
 

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Discussion Starter #43
I see as two high performance options:

Potenza Re050A’s at 245/40-19. Reviews are mixed and the car rags are not too kind. It’s also W rated, I’m not too sure how much that matters since 168 mph I believe is a higher rating than the car’s govenor.

Michelin Pilot Sport PS2 at 255/40-19. I’m not sure these will “fit” without compromising the grip performance. 255’s and an 8” wheel... But the car rags really like this tire and Porche owners seem to fawn over it. Load index is 96 (1565) vs 99 (1709), so not sure how much margin that takes out of the car when cornering hard either. I’ve done .8+g laterally (not the best instrumentation) so far and I’m sure the car can do a LOT better, so not sure how much it’s OK to go lax on load ratings...
 

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I see as two high performance options:

Potenza Re050A’s at 245/40-19. Reviews are mixed and the car rags are not too kind. It’s also W rated, I’m not too sure how much that matters since 168 mph I believe is a higher rating than the car’s govenor.

Michelin Pilot Sport PS2 at 255/40-19. I’m not sure these will “fit” without compromising the grip performance. 255’s and an 8” wheel... But the car rags really like this tire and Porche owners seem to fawn over it. Load index is 96 (1565) vs 99 (1709), so not sure how much margin that takes out of the car when cornering hard either. I’ve done .8+g laterally (not the best instrumentation) so far and I’m sure the car can do a LOT better, so not sure how much it’s OK to go lax on load ratings...

I looked up the Pilot Sports on Tirerack and they are $321!!!! Yikes :) IM going to hunt for some Contis and store them in my garage lol
 

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For whats its worth my 45 with OEM 19 wheels been on Potenza S007A XL 245/45/19 ($190 each at the time)for a little over a year now. Similar ride quality to OEM tires, rotated once, good tread wear and much more grip in my mountain drives. The added width makes the stance that much nicer.

I went for month looking for a reasonable 20inch wheel to fit some Michelin PS4 but im glad i stayed 19.
These look almost like the OEMs. How many miles do you have one them?
 

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Discussion Starter #47

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For whats its worth my 45 with OEM 19 wheels been on Potenza S007A XL 245/45/19 ($190 each at the time)for a little over a year now. Similar ride quality to OEM tires, rotated once, good tread wear and much more grip in my mountain drives. The added width makes the stance that much nicer.

I went for month looking for a reasonable 20inch wheel to fit some Michelin PS4 but im glad i stayed 19.

How are your new tires working out? I've found there are more offerings at 245/45/19. I'm interested because the taller tire might be quieter and give .1 inch more clearance when parking near higher than usual curb stops.
 

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Well, I resigned myself to 245-40/19’s @ a -2.2% diameter difference, and gave up on finding a Y rated tire.

Once I gave up on those two factors, the choice got really, really easy.

https://m.tirerack.com/tires/tires.jsp?tireMake=Bridgestone&tireModel=Potenza+RE-71R&sidewall=Blackwall&partnum=44WR9RE71RXL&tab=Sizes

Thanks guys. Never had such an agonizing think over what tires to buy. Should be good with these, I think. Hopefully they last at least half as long as the contis! ?
You should be amazed at how much stickier those tires are. And they stick in the wet too. Maybe not when it's deep enough to hydroplane, but if the rubber is touching the road, it's gripping. Nice and predictable too. None of that "OOPS! There it went!" crap.

I'm getting different rims (19x9.5) just so I can run that tire in a size that's the ideal diameter. Anyone need some AMG 20" Wheels?!? :D
 

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Discussion Starter #50
Just curious, what wheels are you going with? Reasonably priced or are you throwing caution to the wind?

Our choices in the 9-9.5 width are just so much better than 8
 

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I spent a LOT of time looking for wheels... so it's kind of a long story. Initially, I decided to ignore price, and just see what is even possible.

It all started by finding the tire I wanted to run (RE-71R), then seeing what sizes have a claimed diameter that is correct (+/- 1mm). There were only two options, one for 18" rims and one for 19" rims. I decided on 19" rims for more positive brake caliper clearance. (I did buy 18" rims for the winter tires for more sidewall compliance though) The tire size is 265/40-19 and has a recommended rim width of 9" to 10.5".

Coming from the racing world, weight is kind of a big deal to me. Not the most important, but definitely a big consideration. Looks are not a huge deal. By nature, the lighter the wheel, the simpler it will look. More spokes and contours = more weight. Simple is fine, easier to clean!

Then I did all the most random internet searches for wheels I could think of, trying to find decent wheels in the 19x9 or 19x9.5 size. I am sure I did not find everything available. It seemed hopeless for quite some time. My google-fu is not great apparently. None of the standard "apps" let you select the wider than standard rims, so I had to search each manufacturer individually on their websites, each wheel model specs individually. I looked at a lot of information. Getting discouraged.

I found some really nice expensive rims available, but $2,000 each was out of my range by a long shot.

Eventually I was on the TSW website and they had a great way to search by different criteria than just "what vehicle". I narrowed it down to the high-end rotary forged options. Stronger and lighter, but more expensive. Plenty of great options though, at least a dozen. Plus they list the weight for every single wheel size. They had enough options that I just quit looking elsewhere at that point. There were more than enough there to choose from.

I used this link and sorted by size and construction.
https://www.tsw.com/alloy_wheels.php

I checked them all and found the specs for each one. I haven't made a final decision yet, but it will likely be the Interlagos, Nurburgring or Hockenheim-T. Pretty light, and they all offer a black finish of some sort. I'm considering the load rating options still.

Before I order anything though, I am going to measure all my clearances and input the values into this calculator to see what happens.
https://www.wheel-size.com/calc/

There are probably other calculators I will try as well. Going 30mm wider on the tire is quite a change, so I'd like to have reasonable confidence that they will fit. I didn't really find any info out there where it has been done yet. Might be a reason for that.

I'll start a nice new thread and show all the details once the project is complete, but it likely won't happen until next summer sometime. Had to drop a lot of cash on the winter wheels and the checkbook needs a few months to recover.:|

That ended up being a lot more answer than you asked for, didn't it? Sorry...
 

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Oh, and apparently I didn't even answer half of your question!?!

Price. The manufacturer has an MSRP of $484 per wheel. I have not done a price check anywhere else to see what they can be found for. I'd say my max price is $500/wheel, so these are right there at the limit.
 

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Discussion Starter #53
Nice, very nice.

I like the Genevas enough to consider. They also come rotary forged, same MSRP, come in 19-9.5, and are the ONLY wheels that are matte with those characteristics.

I do not want non-silver wheels or mirror finish. Seems out of style these days.

I wonder if I can get mercedes caps for the wheels.

I’m very curious about your results on dealing with the offset, if you choose to go for it. Please keep us updated. The 265/40/19 is not much more expensive than the 245/40/19

I just took my car in for A service, we found the cords on the passenger tire. Just goes to show, inspect ALL your tires, as the drivers side was not as worn as the passenger side! (Go figure). So I’m moving on the 245/40’s, no choice. But there’s always next year.
 

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Shoulder side can be rougher and knock the alignment out and cause undue wear. Inflation can have an affect as well.
 

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...I just took my car in for A service, we found the cords on the passenger tire. Just goes to show, inspect ALL your tires, as the drivers side was not as worn as the passenger side! (Go figure)...
Too many donuts? :D

I will definitely update when I get it done.

I also just mounted up some Hakkapeliitta 235/50-18 winter tires on Enkei PF01 18x8 racing rims. I measured the diameter and they came out very close to the manufacturer's spec. I also measured the stock Conti's (on 20's) to see how they matched. I don't have the actual data in front of me, but everything was within 1% and measured smaller than claimed. Hopefully the RE-71R's are as accurate.
 

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Discussion Starter #56 (Edited)
Have you tried to do donuts? The only way I can imagine doing that is getting the car well heat soaked then hosing the tires with ice water to get them cooled down then turning super hard at 60 mph with traction control off.

Not that I’ve tried that intentionally...

If those wheels fit your car, I’ll likely follow suit for my car. I like the idea of 265/40/19’s.

Unfortunately I’m boneheaded and didn’t measure my conti’s yesterday so I have no idea if the 2.2% hit I will take with the RE-71R’s is real or measured-only. I can only check by GPS, see if I’m off by more than 1 mph at 60. That should be the biggest impact with such a large drop in diameter.
 

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How are your new tires working out? I've found there are more offerings at 245/45/19. I'm interested because the taller tire might be quieter and give .1 inch more clearance when parking near higher than usual curb stops.

sorry dont visit here often. Tires are doing great, a little bit of camber wear from the front but no problems at all with all the recent bay area rains. Tread wear looks similar to the older contis and i think i will get about 3-4 yrs (im at 1.5 years now)

To be honest you dont even notice the height difference but the stance of the car is much nicer.
 

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sorry dont visit here often. Tires are doing great, a little bit of camber wear from the front but no problems at all with all the recent bay area rains. Tread wear looks similar to the older contis and i think i will get about 3-4 yrs (im at 1.5 years now)

To be honest you dont even notice the height difference but the stance of the car is much nicer.

Thanks for the input! I'm approaching the 4 year mark with the oem's and ready for new tires. The original Conti's are still ok but they also have camber wear along with being cupped, which yields a nasty sound.

I am wondering why the tires tend to show camber wear and will ask for a wheel alignment to make sure this doesn't happen with the new Michelins. I am so looking forward to a quieter ride!
 

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sorry dont visit here often. Tires are doing great, a little bit of camber wear from the front but no problems at all with all the recent bay area rains. Tread wear looks similar to the older contis and i think i will get about 3-4 yrs (im at 1.5 years now)

To be honest you don't even notice the height difference but the stance of the car is much nicer.

Thanks for the input! I'm approaching the 4 year mark with the oem's and ready for new tires. The original Conti's are still ok but they also have camber wear along with being cupped, which yields a nasty sound.

I am wondering why the tires tend to show camber wear and will ask for a wheel alignment to make sure this doesn't happen with the new Michelins. I am so looking forward to a quieter ride!
Manufacturers tend toward safety (and comfort) with their alignment specs. From my limited experience with the GLA I feel that MB set the camber for highway stability rather than tire life. You may want to ask for some adjustments.

My OEM Contis wore on the inside. Not too badly but I asked my specialist to adjust the camber (out at the top) and the Michelin PS4 tires are wearing evenly ... but the car will wander a bit more at speed with cross winds. Not too bad but ... Compromises!!!

The cupping is more of a concern. Cupping happens if you scuff the tire which can happen for a number of reasons. Once this scuff happens on one side of the tire it will duplicate at 180 degrees. Then at the 90 degree locations. Then at the 45 angles. And so forth.

Hard (lock up) braking, bad shocks, poor tire balancing (thrown weight), and potholes make up a small list of possible causes.
 
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