G70 i7 alternative tire sizing

[AventurinG26]

Our i7 xDrive60 with only 17K miles has already chewed through the front tires on both outer edges. The rears aren’t much better off. I have always kept the tires inflated actually slightly above the recommended PSI so I’m not sure why the edges of the tires would even be in contact with the road unless there’s some sort of severe alignment issue.

Anyway, there’s hardly any tires available in the 20” OE 255/285 staggered widths. I am thinking about going 265/45R20 front and rear because it opens up a lot of extra tire choices and would also mean no more half tire wear warranty issues. Has anyone gone to a square fitment on the 20” or 21” wheels? These Bridgestone LS100 tires have a very high tread wear rating which is typically a sign of long life, but it appears they can’t hold up to the weight of a 3 ton vehicle. It’s disconcerting the front tires would have already worn out and the rears are soon to be bald, too. I’ve had 4 EVs and none of them except a Model 3 Performance on Pilot Sport 4S which are known to have short lifespans came even close to wearing out this fast. 90% of our mileage is interstate driving. Tires were rotated twice in 17K miles. No pulling or other obvious signs of an alignment issue, but obviously something is up.

One benefit typically of square sizing is that you can rotate front to back, but with the wheels being different widths and having different offsets it would appear that won’t be possible. As an alternative I’m looking at going down to 245/45R20//275/40R20 which has many more all season tires available with actual mileage warranties, something the Bridgestones do not offer. If anyone has made a change in sizing I would love to know your experience.

[Jaywin]

Originally Posted by AventurinG26

Our i7 xDrive60 with only 17K miles has already chewed through the front tires on both outer edges. The rears aren’t much better off. I have always kept the tires inflated actually slightly above the recommended PSI so I’m not sure why the edges of the tires would even be in contact with the road unless there’s some sort of severe alignment issue.

Anyway, there’s hardly any tires available in the 20” OE 255/285 staggered widths. I am thinking about going 265/45R20 front and rear because it opens up a lot of extra tire choices and would also mean no more half tire wear warranty issues. Has anyone gone to a square fitment on the 20” or 21” wheels? These Bridgestone LS100 tires have a very high tread wear rating which is typically a sign of long life, but it appears they can’t hold up to the weight of a 3 ton vehicle. It’s disconcerting the front tires would have already worn out and the rears are soon to be bald, too. I’ve had 4 EVs and none of them except a Model 3 Performance on Pilot Sport 4S which are known to have short lifespans came even close to wearing out this fast. 90% of our mileage is interstate driving. Tires were rotated twice in 17K miles. No pulling or other obvious signs of an alignment issue, but obviously something is up.

One benefit typically of square sizing is that you can rotate front to back, but with the wheels being different widths and having different offsets it would appear that won’t be possible. As an alternative I’m looking at going down to 245/45R20//275/40R20 which has many more all season tires available with actual mileage warranties, something the Bridgestones do not offer. If anyone has made a change in sizing I would love to know your experience.

Can give Pirelli P Zero (BMW) a try. Mine is on it but so far I clocked only half of your mileage

[AventurinG26]

Originally Posted by Jaywin

Can give Pirelli P Zero (BMW) a try. Mine is on it but so far I clocked only half of your mileage

My biggest problem is that those are $400/tire for the front and $525/tire for the rears and include zero mileage warranty. If they wear out in 5000 miles there’s $2000 down the drain. I’m looking at going to 245/45R20 and 275/40R20 and trying out either the Michelin Primacy Tour A/S which have a 55K mile warranty and cost 1/2 as much as the Pirellis or the Pirelli P Zero AS Plus 3 which have a 50K mile warranty and are also about $250/tire.

Have you measured the tread on your tires to see if they’re wearing normally? I’ve seen a bunch of folks reporting the exact issue I had with the front tires wearing out on the outer edge but nobody specified what tire their car had, either the Bridgestone or Pirellis.

[Jaywin]

Originally Posted by AventurinG26

My biggest problem is that those are $400/tire for the front and $525/tire for the rears and include zero mileage warranty. If they wear out in 5000 miles there’s $2000 down the drain. I’m looking at going to 245/45R20 and 275/40R20 and trying out either the Michelin Primacy Tour A/S which have a 55K mile warranty and cost 1/2 as much as the Pirellis or the Pirelli P Zero AS Plus 3 which have a 50K mile warranty and are also about $250/tire.

Have you measured the tread on your tires to see if they’re wearing normally? I’ve seen a bunch of folks reporting the exact issue I had with the front tires wearing out on the outer edge but nobody specified what tire their car had, either the Bridgestone or Pirellis.

So far it's doing fine on tread wear, however I am at half of your mileage. Only complain I have with Pirelli is it look flat. TPM show pressure is normal but it looks like just enough air in it

[AventurinG26]

Originally Posted by Jaywin

So far it's doing fine on tread wear, however I am at half of your mileage. Only complain I have with Pirelli is it look flat. TPM show pressure is normal but it looks like just enough air in it

Our tires went from looking fine to worn out really fast. The fact both fronts wore out on the outer edges leads me to think it’s a tire issue, but also could be alignment. I bumped tire pressures up to 45PSI. Slightly firmer ride but the car gets much better efficiency on the highway. That’s why I’m also baffled the tires wore out so quickly. Lower pressure is usually the cause of premature wear on edges.

[Jaywin]

Originally Posted by AventurinG26

Our tires went from looking fine to worn out really fast. The fact both fronts wore out on the outer edges leads me to think it’s a tire issue, but also could be alignment. I bumped tire pressures up to 45PSI. Slightly firmer ride but the car gets much better efficiency on the highway. That’s why I’m also baffled the tires wore out so quickly. Lower pressure is usually the cause of premature wear on edges.

45PSI?? I am running mine on factory 2.2Bar. Roughly 31,32 PSI.

[AventurinG26]

Originally Posted by Jaywin

45PSI?? I am running mine on factory 2.2Bar. Roughly 31,32 PSI.

That’s not the recommended pressures in the US. That’s very low PSI for a car that weighs this much, especially if energy consumption is a concern of yours. Look at Teslas or even Mercedes EVs, they all have high pressures specced for lower rolling resistance. The tires are rated up to 51PSI (cold). Mercedes and BMW also recommend increasing tire pressure if you are going to be driving at higher speeds as the lower rolling resistance means less friction and heat are generated.

[mjr24]

You are going to bend a rim the first pothole you see….why do you have them that low?

[mjr24]

Originally Posted by AventurinG26

Our i7 xDrive60 with only 17K miles has already chewed through the front tires on both outer edges. The rears aren’t much better off. I have always kept the tires inflated actually slightly above the recommended PSI so I’m not sure why the edges of the tires would even be in contact with the road unless there’s some sort of severe alignment issue.

Anyway, there’s hardly any tires available in the 20” OE 255/285 staggered widths. I am thinking about going 265/45R20 front and rear because it opens up a lot of extra tire choices and would also mean no more half tire wear warranty issues. Has anyone gone to a square fitment on the 20” or 21” wheels? These Bridgestone LS100 tires have a very high tread wear rating which is typically a sign of long life, but it appears they can’t hold up to the weight of a 3 ton vehicle. It’s disconcerting the front tires would have already worn out and the rears are soon to be bald, too. I’ve had 4 EVs and none of them except a Model 3 Performance on Pilot Sport 4S which are known to have short lifespans came even close to wearing out this fast. 90% of our mileage is interstate driving. Tires were rotated twice in 17K miles. No pulling or other obvious signs of an alignment issue, but obviously something is up.

One benefit typically of square sizing is that you can rotate front to back, but with the wheels being different widths and having different offsets it would appear that won’t be possible. As an alternative I’m looking at going down to 245/45R20//275/40R20 which has many more all season tires available with actual mileage warranties, something the Bridgestones do not offer. If anyone has made a change in sizing I would love to know your experience.

So I am in the process of deciding between a i5 M60 and a i7 60......really want the 21 inch rims on whatever car I decide. It actually factors into which car I end up choosing. Obviously, I need winter or all season options (being in Wisconsin).

For the i5....there literally is not 1 all season or winter option for the 21 inch OEM wheels and I researched changing tire sizes and it's not possible because the bigger issue is the load rating on the EV. Using a slightly different tire size would be under OEM specs and I don't want to risk that. So it's a legit no-go on the i5 M60.

That brought me to the i7....I found this thread here...
https://www.7post.com/forums/showthread.php?t=1987794

He was able to find a good size for the 21 inch wheels that would not rub and would have lots more tire options (and they all are good in terms of the load rating). So, that might be a starting point for you.

We actually have an X7 and most of us X7 people have successfully gone to a square setup. We are running 285/40/22 when the OEM sizes are 275/40/22 and 315/35/22. Most of us have all been doing this since 2019 when the X7 came out and it's worked perfectly.

So, your idea of maybe going 265/40/20 would be the same really as what we did on the X7 (meaning we all just got a 10mm wider than OEM front tire and used them for all 4 tires). I'm not saying it WILL WORK but theoretically it probably would. The trade-off is we are losing a little width in the back but it's not noticeable, at all.....we also have like 55k miles on our all seasons now and they still have good tread left so we've saved a ton versus switching out staggered tire sizes all the time on tires that wear out fast.

Load index I would imagine won't be an issue....nor will front to back rolling circumference ratio in terms of X-Drive. So, you are 2 for 2 there. I don't have the 20 inch wheel specs in front of me....but make sure the 265 series tire will fit the rim width on the front and back. That was an issue I ran into for 1 tire size I thought might work as Plan B for the i5.....but then I realized the 1 larger tire size would actually be too wide for the front rim size on the i5 so that ruined that option for me. Then your only other real obstacle is making sure it doesn't rub anything.....but if 295 wasn't rubbing anything on the guy's 7 in the link above then I can't imagine you will have an issue with 265.

[AventurinG26]

Originally Posted by mjr24

So I am in the process of deciding between a i5 M60 and a i7 60......really want the 21 inch rims on whatever car I decide. It actually factors into which car I end up choosing. Obviously, I need winter or all season options (being in Wisconsin).

For the i5....there literally is not 1 all season or winter option for the 21 inch OEM wheels and I researched changing tire sizes and it's not possible because the bigger issue is the load rating on the EV. Using a slightly different tire size would be under OEM specs and I don't want to risk that. So it's a legit no-go on the i5 M60.

That brought me to the i7....I found this thread here...
https://www.7post.com/forums/showthread.php?t=1987794

He was able to find a good size for the 21 inch wheels that would not rub and would have lots more tire options (and they all are good in terms of the load rating). So, that might be a starting point for you.

We actually have an X7 and most of us X7 people have successfully gone to a square setup. We are running 285/40/22 when the OEM sizes are 275/40/22 and 315/35/22. Most of us have all been doing this since 2019 when the X7 came out and it's worked perfectly.

So, your idea of maybe going 265/40/20 would be the same really as what we did on the X7 (meaning we all just got a 10mm wider than OEM front tire and used them for all 4 tires). I'm not saying it WILL WORK but theoretically it probably would. The trade-off is we are losing a little width in the back but it's not noticeable, at all.....we also have like 55k miles on our all seasons now and they still have [...]

The other thing is with all of these EVs having no driveshaft connection between front and rear, there’s really no AWD system to worry about in terms of damaging something. I am now thinking about going 265/45R20 and 275/45R20 because it opens the possibility of the Hankook Ion Evo AS SUV tire (I know the i7 isn’t an SUV but it weighs more than most) and I also have those on our Kia EV6 GT and they’ve been great tires… still look like new with 30K miles on them and they are super super efficiency focused and quiet while not being complete crap to drive. There is a slight difference in rotating speed between the two sizes (fronts would rotate 710 revolutions per mile vs. 701RPM for rear) but since there’s no driveshaft connection between the two motors I don’t see what the issue would be. I would hope a 1.3% difference in rotation speed would not be large enough to throw up warnings. In my opinion you could easily have that much difference having two brand new full tread tires on the rear and two nearly worn out tires on the front. The car has to be able to account for some speed difference, especially when it’s using staggered wheels anyway. My M440i had about that much of a difference coming with 245/40R19 and 255/40R19 tires.

[mjr24]

Yeah I’ve definitely encountered SUV tires in these sizes and have wondered if there actually is any difference between that and a “car” tire.

[AventurinG26]

Originally Posted by mjr24

Yeah I’ve definitely encountered SUV tires in these sizes and have wondered if there actually is any difference between that and a “car” tire.

I’m just curious if the 275/45R20 will fit the rear. Its 29.6” overall diameter. Obviously the width isn’t the issue here, it’s the overall diameter of the tire. I would imagine there’s some room built into the car for safety.

I just dropped the car off for service at my local dealer and the guy said “I’ve got 3 other i7/7er here for tires today. These new ones are chewing through the tires to the cords at 12-15K miles.”

[Streamliner]

I know this is an old thread, but would like to know which tires you guys went with and if you are happy with them. Thanks.

[F5506m]

BMW Recommended Tire Pressure Cold for i7 with 20-Inch wheels (as per label on the driver's door) is 36 PSI Front and 39 PSI Rear.

The BMW app gives you real time Recommended Tire Pressure depending on Tire Temp and those usually max's out at Front 38 PSI and Rear 41 PSI (warm tires).

I am averaging approx. 2.8 mi/KWh to 3.3 mi/KWh on most drives (highway and city.) That equates to a range of 285 miles to 335 miles at 100%. BMW advertised range is between 296 miles to 311 miles.

[BMW5and7]

Originally Posted by F5506m

BMW Recommended Tire Pressure Cold for i7 with 20-Inch wheels (as per label on the driver's door) is 36 PSI Front and 39 PSI Rear.

The BMW app gives you real time Recommended Tire Pressure depending on Tire Temp and those usually max's out at Front 38 PSI and Rear 41 PSI (warm tires).

I am averaging approx. 2.8 mi/KWh to 3.3 mi/KWh on most drives (highway and city.) That equates to a range of 285 miles to 335 miles at 100%. BMW advertised range is between 296 miles to 311 miles.

Same here. 500 miles of mixed driving so far, and I am averaging 3 mi/kWh with my 21” wheels (Perilli P Zero) at 4 PSI lower than recommended (38 PSI instead of 42). Super smooth, almost near silent if not silent already. 101.7 kWh usable battery * 3 mile/kWh = 305 miles of range, well within the advertised 296-311 miles estimated range for the xDrive60.

Conditions: 68 degF AC temp, auto fan speed medium speed; day-time driving only, ~90degF ambient, 38 PSI @21” wheels.

[BMW_WI]

Originally Posted by Streamliner

I know this is an old thread, but would like to know which tires you guys went with and if you are happy with them. Thanks.

Any solustion to this issue, besides inflation matter or the brand of tires? Is the issue related to brands of tires or is it happening across several brands of tires?
I maintain tire pressure about 2 to 3 psi above recommended level. I had the alignment checked and the front tires were within spect; rears were not. How ever there is no uneven wear on the rears. Only the fronts have both the edges on each tire, wearing out fast.
I have a 2nd i7, which does not seem to have this problem. That one has good year run flats on it. Does the brand of tires make a difference?

[AventurinG26]

Originally Posted by BMW_WI

Any solustion to this issue, besides inflation matter or the brand of tires? Is the issue related to brands of tires or is it happening across several brands of tires?
I maintain tire pressure about 2 to 3 psi above recommended level. I had the alignment checked and the front tires were within spect; rears were not. How ever there is no uneven wear on the rears. Only the fronts have both the edges on each tire, wearing out fast.
I have a 2nd i7, which does not seem to have this problem. That one has good year run flats on it. Does the brand of tires make a difference?

It’s all tires. We are on the third set before 40K miles. It’s insane. The issue is the alignment specs. There is too much camber and toe causing the tires to wear out prematurely. It also doesn’t help the car weighs 6000lbs which is a lot of weight. Add in air suspension which raises and lowers the cars (which increases camber even more when the car lowers at highway speed) and they’ve designed a car that eats through tires like no other. It’s also affecting ICE 7-series so the issue isn’t just an i7 problem. It’s a G70 problem. On top of that the 20”/21” wheels come with staggered tires so you cannot rotate the tires front to back to even out wear.

[AventurinG26]

Originally Posted by F5506m

BMW Recommended Tire Pressure Cold for i7 with 20-Inch wheels (as per label on the driver's door) is 36 PSI Front and 39 PSI Rear.

The BMW app gives you real time Recommended Tire Pressure depending on Tire Temp and those usually max's out at Front 38 PSI and Rear 41 PSI (warm tires).

I am averaging approx. 2.8 mi/KWh to 3.3 mi/KWh on most drives (highway and city.) That equates to a range of 285 miles to 335 miles at 100%. BMW advertised range is between 296 miles to 311 miles.

If you select you drive at speeds over 100mph it instantly recommends higher tire pressures. Our car recommends 45psi rear, 41psi front right now, but I’ve seen it show as much as 48psi before. It’s kinda all over the place. The ride quality in this car is soft enough that even at higher tire pressures it rides well enough to smother out most of the imperfections in the road.

I would really like to talk to someone who is an alignment professional that could tell me how much adjustment could be made to the car’s alignment without drastically affecting handling and stability. These cars are destroying tires like nothing I’ve ever seen. Even Model S Plaids with 2X as much power don’t eat through all season touring tires in 10-15K miles like the i7. On the other end of the spectrum, big heavy full size luxury sedans like the Genesis G90 and S-Class also don’t seem to destroy tires this quickly. The EQS is just as big and heavy but people are getting 30K+ miles out of their sets of tires.

[BMW_WI]

Originally Posted by AventurinG26

It’s all tires. We are on the third set before 40K miles. It’s insane. The issue is the alignment specs. There is too much camber and toe causing the tires to wear out prematurely. ....

Is this happening for every i7 or some i7s?
I am using Good year run flats on my 23 i7. Its OEM tires were the same. Perhaps put around 8k miles on new tires. I see no sign of wear on either of the edges.
Ordered the same for my 24 i7 (currently has the factory bridgestone). Wheel alignment was done on this car, 2000 miles/2 months ago and the tires seem to be wearing down at both edges on the front two tires, even more rapidly after the alignment.
You are on your 3rd set in 40k miles? Which model year i7 is yours?
A friend has a 24 i7 with about 6.6k miles; no visible tire wear at the edges.

[BMW5and7]

Originally Posted by BMW_WI

Is this happening for every i7 or some i7s?
I am using Good year run flats on my 23 i7. Its OEM tires were the same. Perhaps put around 8k miles on new tires. I see no sign of wear on either of the edges.
Ordered the same for my 24 i7 (currently has the factory bridgestone). Wheel alignment was done on this car, 2000 miles/2 months ago and the tires seem to be wearing down at both edges on the front two tires, even more rapidly after the alignment.
You are on your 3rd set in 40k miles? Which model year i7 is yours?
A friend has a 24 i7 with about 6.6k miles; no visible tire wear at the edges.

To me, It looks like it is just his car. I’ve put 7K miles on my tires sooo quickly, with a good mix of in-town and a number of happy highway trips with family. I just replaced those summer RF tires with slightly wider All-season NRF tires couple weeks ago. I asked DiscountTire to measure the Summer tires for me and they had 80% of life left. I asked them to wrap them up in a bag so I can store them in my garage, which I did. The ride moved from phenomenal to super phenomenal, as I never ever imagined the ride could still be improved but it did. I am expecting ever better lifetime from the all-season RF now.

I think the life of tires depend on the region and climate, and driving habbits. Summer tires in moderate lower-temp climate zones will not last long. All-season in very hot climates also will not last too long.

[BM8888]

Mine came with Bridgestone LS100s, and the fronts are basically toast now with outer edges looking like drifting tires (at 15k miles)

What sucks is BMW (and other brands like Mercedes) put lower thread tires on cars. For example my tires started at 8/32 when ideally they should have started at least at 10-11/32. I've previously had an EQS, and it went through tires as quick, actually even faster than the i7. Bought brand new set for rear and it only lasted 9k miles.

I'm switching to 22 inch wheels now (265/35/22 and 295/30/22 size Toyo tires), so we will see how long they would last.