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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > All-Wheel-Drive (Xi / xDrive) Talk > 2021 Tire Thread AWD



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      03-14-2021, 08:01 PM   #1
SiEgs90
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2021 Tire Thread AWD

Iím looking to throw on some new tires this year since my summer tires are about done. 4/32. Iíve had on 16Ē Pirelli P7 Summer Go Flats for about 3-4 years during April-Nov. Iím thinking of ditching summers for a performance all season tire throughout March-December. Iím doing this so Iím not stuck with summer tires on and a freak cold spell comes around during the months of March, April, October. Iíve read using non star approved BMW tires being bad for the AWD system, but I donít know how thatís possible. I also read that using non run flats and non star approved tires will result in a more floaty ride because of the suspension being designed to run on RFTs. Iíve been using non run flat Dunlop Winter 4D Sports tires for the last 3 years during winter. The car is definitely floaty over dips at high speeds. So with that being said I was wondering if anybody likes all season high performance or all season ultra high performance tires? I like the idea of the longer treadlife as opposed to summer tires which do not have a tread life warranty and seem to wear down rather quickly. Like the look of the Kumho Ecsta PA51s and the Sumitomo P03. Maybe a Kumho PS31 if I want to stay with summers. As long as the speed rating and load index is fine I donít see the big deal with ditching BMW approved tires.
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      03-15-2021, 06:51 PM   #2
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Non run-flat tires will make the car better in every way. (unless you get a flat tire)

Pay no mind to the BMW 'approval' for tires. On some subjects BMW's s*** smells the same as everybody else's.

I like the Continental DWS for moderate performance summer street tires. I like the DW better but they aren't available anymore.

Really you'll have a hard time making a bad decision for 'moderate performance' street tires. A lot of good tires out there. Read reviews at tirerack to alert you for excessive noise or bad wet performance.
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      03-15-2021, 06:57 PM   #3
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Quote:
Originally Posted by Brian86 View Post
Non run-flat tires will make the car better in every way. (unless you get a flat tire)

Pay no mind to the BMW 'approval' for tires. On some subjects BMW's s*** smells the same as everybody else's.

I like the Continental DWS for moderate performance summer street tires. I like the DW better but they aren't available anymore.

Really you'll have a hard time making a bad decision for 'moderate performance' street tires. A lot of good tires out there. Read reviews at tirerack to alert you for excessive noise or bad wet performance.
True. I read that if youíre running AWD anyway and you get a flat youíre
probably better off replacing all four tires because the difference in tread depth can make your diff work harder than it needs to. So why buy run flats if youíre gonna have to replace it anyway. Or buy a replacement tire and have it shaved down to match the tread of all the other tires.
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      03-16-2021, 07:00 PM   #4
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Unless somebody else chimes in with e9x specific experiences about the computer getting angry...

I wouldn't expect running one new tire and 3x old ones to bother the car very much. The transfer case is very forgiving of different rotational speeds. It's engineered to be slipping continuously even when the tires are perfectly matched.

Differentials have been handling tires with different wear thicknesses, and even mismatched tires for about 100 years without too many problems. These cars don't have limited diff's so as long as they are pretty close it'll run alright.
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      03-18-2021, 08:09 AM   #5
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Quote:
Originally Posted by SiEgs90 View Post
Iím looking to throw on some new tires this year since my summer tires are about done. 4/32. Iíve had on 16Ē Pirelli P7 Summer Go Flats for about 3-4 years during April-Nov. Iím thinking of ditching summers for a performance all season tire throughout March-December. Iím doing this so Iím not stuck with summer tires on and a freak cold spell comes around during the months of March, April, October. Iíve read using non star approved BMW tires being bad for the AWD system, but I donít know how thatís possible. I also read that using non run flats and non star approved tires will result in a more floaty ride because of the suspension being designed to run on RFTs. Iíve been using non run flat Dunlop Winter 4D Sports tires for the last 3 years during winter. The car is definitely floaty over dips at high speeds. So with that being said I was wondering if anybody likes all season high performance or all season ultra high performance tires? I like the idea of the longer treadlife as opposed to summer tires which do not have a tread life warranty and seem to wear down rather quickly. Like the look of the Kumho Ecsta PA51s and the Sumitomo P03. Maybe a Kumho PS31 if I want to stay with summers. As long as the speed rating and load index is fine I donít see the big deal with ditching BMW approved tires.
Forget approved tires. Even BMW dealerships sell "non-approved" tires. It is one of those BMW gimmick they use to rack up profit.
Truth is BMW suspension is made with RFT in mind, but it does not require too much to get it in order. xDrive are base suspension, so going better shocks would help (as far as I know, B4 are bit harder than OE, and many people like on street KONI Special red).
What you could do is change strut/shock mounts to Monroe ones. They are cheap, made out of rubber and not foam like BMW ones. That is go to uber cheap way to negate effect of not having RFT's.
I run in winter on my 328 205/55 R16 snow tires, and works like charm. Reason is all new potholes that pop out in winter, and thick sidewall really helps protecting suspension from damage.
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      03-19-2021, 09:38 AM   #6
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Quote:
Originally Posted by SiEgs90 View Post
Iím looking to throw on some new tires this year since my summer tires are about done. 4/32. Iíve had on 16Ē Pirelli P7 Summer Go Flats for about 3-4 years during April-Nov. Iím thinking of ditching summers for a performance all season tire throughout March-December. Iím doing this so Iím not stuck with summer tires on and a freak cold spell comes around during the months of March, April, October. Iíve read using non star approved BMW tires being bad for the AWD system, but I donít know how thatís possible. I also read that using non run flats and non star approved tires will result in a more floaty ride because of the suspension being designed to run on RFTs. Iíve been using non run flat Dunlop Winter 4D Sports tires for the last 3 years during winter. The car is definitely floaty over dips at high speeds. So with that being said I was wondering if anybody likes all season high performance or all season ultra high performance tires? I like the idea of the longer treadlife as opposed to summer tires which do not have a tread life warranty and seem to wear down rather quickly. Like the look of the Kumho Ecsta PA51s and the Sumitomo P03. Maybe a Kumho PS31 if I want to stay with summers. As long as the speed rating and load index is fine I donít see the big deal with ditching BMW approved tires.
I ran DWS 06 all seasons on my 330i and never had an issue with a PA winter. I think I paid $500 for a set of 18s on my E90 which to me was very affordable for the quality of tire.
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      03-21-2021, 07:05 PM   #7
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Quote:
Originally Posted by Nickco43 View Post
I ran DWS 06 all seasons on my 330i and never had an issue with a PA winter. I think I paid $500 for a set of 18s on my E90 which to me was very affordable for the quality of tire.
Iíll keep that in mind. In PA as well. Itís such a weird state for weather and weather can change on a dime in the transitional months. One day is 65 and the next day the high is 39.
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      03-21-2021, 07:07 PM   #8
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Quote:
Originally Posted by edycol View Post
Forget approved tires. Even BMW dealerships sell "non-approved" tires. It is one of those BMW gimmick they use to rack up profit.
Truth is BMW suspension is made with RFT in mind, but it does not require too much to get it in order. xDrive are base suspension, so going better shocks would help (as far as I know, B4 are bit harder than OE, and many people like on street KONI Special red).
What you could do is change strut/shock mounts to Monroe ones. They are cheap, made out of rubber and not foam like BMW ones. That is go to uber cheap way to negate effect of not having RFT's.
I run in winter on my 328 205/55 R16 snow tires, and works like charm. Reason is all new potholes that pop out in winter, and thick sidewall really helps protecting suspension from damage.
I replaced the rears with B4 and new stock springs. Will be doing the front soon as well. Theyíre def a bit harder.
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      03-21-2021, 10:10 PM   #9
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Also, if BMW uses RFTs to match up with their suspension would using a go flat tire with a higher load index compensate for that? Iíve seen a lot of tires listed for my car rated at a 91SL which is what the car came with and saw some Sumitomos with a load index of 94XL. Would this stiffer sidewall be an improvement and would it help alleviate some strain on the suspension?
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      03-22-2021, 08:21 AM   #10
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Quote:
Originally Posted by SiEgs90 View Post
Also, if BMW uses RFTs to match up with their suspension would using a go flat tire with a higher load index compensate for that? Iíve seen a lot of tires listed for my car rated at a 91SL which is what the car came with and saw some Sumitomos with a load index of 94XL. Would this stiffer sidewall be an improvement and would it help alleviate some strain on the suspension?
Going XL is not going to negate effects of not having RFT. IMO non-RFT is improvement as it gives more natural feeling and reduces rotational weight. Excessive weight on wheels is the worst possible thing.
My 205/55 R16 are 91 XL, and they behave like 205/55 tire. Bit undertire for E90 and the way I drive, but I ski once a week in CO, and I really need capable snow tire. I would go different, stiffer mounts to resolve that issue. Monroe are upgrade and cheap!
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      03-22-2021, 08:23 AM   #11
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Quote:
Originally Posted by SiEgs90 View Post
I replaced the rears with B4 and new stock springs. Will be doing the front soon as well. Theyíre def a bit harder.


Thanks for input. I track car, but also use it to drive kids to daycare etc. So need to be family and track capable
I am going to do soon shock replacement and thinking between B4, B6 or Koni SA.
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      03-22-2021, 01:38 PM   #12
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Quote:
Originally Posted by edycol View Post
[/SIZE]
Thanks for input. I track car, but also use it to drive kids to daycare etc. So need to be family and track capable
I am going to do soon shock replacement and thinking between B4, B6 or Koni SA.
I grabbed the B4 because ECS had them for around $230 for front and rears. The rears are at about 25k on them and no leaks.
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      03-22-2021, 02:54 PM   #13
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Quote:
Originally Posted by SiEgs90 View Post
I grabbed the B4 because ECS had them for around $230 for front and rears. The rears are at about 25k on them and no leaks.
Yeah, for xDrive they are $390.
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      03-22-2021, 09:03 PM   #14
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I've been running Michelin Pilot AS/3's on both of my BMW's. No floaty feel whatsoever and love the way they grip in the wet and dry. Very tight handling on my 'X' drive and my xi. I highly recommend them if you are not trying to make them work in snow. They have been awesome on track as well (I'm sure the Pilot or a true summer performance would outperform them).
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      03-23-2021, 11:22 AM   #15
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Originally Posted by caldep View Post
I've been running Michelin Pilot AS/3's on both of my BMW's. No floaty feel whatsoever and love the way they grip in the wet and dry. Very tight handling on my 'X' drive and my xi. I highly recommend them if you are not trying to make them work in snow. They have been awesome on track as well (I'm sure the Pilot or a true summer performance would outperform them).
I have them on wife's Tiguan. They are borderline summer tire. Exceptional performance in dry and wet for A/S tire. I use it for cold weather, as I switch all 3 cars to snow tires in winter.
I personally like to have separate wheels for track (I found 4 18" wheels from E60 550i for $100, and I just got Falken Azenis 615+ tires for them) as I do not want to damage tire on track, and use it driving kids around.
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      03-25-2021, 03:12 PM   #16
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I run the Pilot Sport AS3 as well. 335xi, stage 2 on KW V3s. I'm in VA and have them on the car year round. Great performance for an AS street tire, good wear too. I'm not sure I'd run them at the track, I think they would wear unusually fast but that's just based on some advice from a friend. I have the continental equivalent on my 335i, those are nice as well.
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      04-02-2021, 02:42 PM   #17
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Quote:
Originally Posted by edycol View Post
What you could do is change strut/shock mounts to Monroe ones. They are cheap, made out of rubber and not foam like BMW ones. That is go to uber cheap way to negate effect of not having RFT's.
Yes, Monroe would be uber cheap. For a noticeable improvement, switch to poly rear upper mounts. I noticed the firmed up rear end immediately once I installed the Powerflex but, mind you, I did install them at the same time as Koni yellows (on stock springs). For comparison, I installed the front Koni yellows separately and felt minimal improvement in handling. Bonus: zero squeaks/noises (a welcome benefit compared to poly antisway bar bushings!).
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      04-11-2021, 01:31 PM   #18
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I have a 2021 M340xdrive on order, with staggered PS4s. Planning ahead when those eventually wear out to replace with AS4+ (assuming they have the size)

I once had the AS3's on a 535. great tire. Hope the AS4 will fit the M340 eventually. (if not I guess can still go with the AS3.
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