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      08-27-2020, 03:35 PM   #1
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275/45/21 tires - are they safe?

Hey guys,

The OEM tire size for the 21's is 275/40/21 for the fronts.

Is it safe to use a 275/45/21 if someone would like to keep the 21-inch rims but achieve a larger sidewall (for the winter time)?

Similarily would it be okay to match that with a 315/40/21 for the rears VS a 305/35/21?

EDIT: Spoke to 2 different BMW techs and they confirmed that besides the ~3% speed change in the odometer there will be no issue with this setup - for anyone who was thinking about it.
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Last edited by Pumxee; 08-27-2020 at 06:16 PM..
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      08-31-2020, 04:56 PM   #2
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I have the same question. Could anyone help?
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      08-31-2020, 04:58 PM   #3
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Quote:
Originally Posted by Maximus2002 View Post
I have the same question. Could anyone help?
Spoke to 2 different BMW techs and they confirmed that besides the ~3% speed change in the odometer there will be no issue with this setup - for anyone who was thinking about it.

Unforunately, the rims I was looking at are machined aluminum, which I've been told are not suitable for winter and if I run them in winter I will void the warranty so I've scratched that plan for now and decided to just go with BR-10 Rims in 20 Diameter.
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      08-31-2020, 05:06 PM   #4
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Quote:
Originally Posted by Pumxee View Post
Spoke to 2 different BMW techs and they confirmed that besides the ~3% speed change in the odometer there will be no issue with this setup - for anyone who was thinking about it.

Unforunately, the rims I was looking at are machined aluminum, which I've been told are not suitable for winter and if I run them in winter I will void the warranty so I've scratched that plan for now and decided to just go with BR-10 Rims in 20 Diameter.
Thank you Pumxee for your quick response. My concern would be the fitment of the front 275/45/R21 tires. Would those slightly taller tires fit without touching the upper suspension joint?
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      08-31-2020, 05:09 PM   #5
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Quote:
Originally Posted by Maximus2002 View Post
Thank you Pumxee for your quick response. My concern would be the fitment of the front 275/45/R21 tires. Would those slightly taller tires fit without touching the upper suspension joint?
Yes, according to the tech they will fit the air suspension model just fine so they would fit all other models easily since the air suspension can be lowered quite a bit.
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      08-31-2020, 05:12 PM   #6
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Quote:
Originally Posted by Pumxee View Post
Yes, according to the tech they will fit the air suspension model just fine so they would fit all other models easily since the air suspension can be lowered quite a bit.
Thank you for your time. I really want to get rid of those RF tires.

Last edited by Maximus2002; 09-17-2020 at 10:35 PM..
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      09-01-2020, 06:49 AM   #7
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Quote:
Originally Posted by Pumxee View Post
Unforunately, the rims I was looking at are machined aluminum, which I've been told are not suitable for winter and if I run them in winter I will void the warranty so I've scratched that plan for now and decided to just go with BR-10 Rims in 20 Diameter.
Uhhhhh... excuse me? What kind of an aftermarket rim company "doesn't offer a warrantee if they are used in the winter"??? Rims are rims. Aluminum, steel, carbon, titanium.... whatever. If they are suitable to be bolted on to a car, and safe enough to hold up the weight of that car without collapsing.... then they are suitable to be driven in the winter.

Tires? Yes. Tires make a difference between winter/summer

Wheels? Never in the 60+ cars I've owned, 14 cars I've restored, hotrodded, modified, or raced, and the 30+ years I've been working on cars.... have I EVER heard of a "Summer only wheel"... ever.

"Machined aluminum"... means basically "The exact same wheel construction as 98% of every other wheel on the planet"

That sounds like a shitty wheel company, making any excuse they can not to honor a warrantee. Perhaps they apply a substandard finish to the wheels, and after a few unhappy customers complained, they instilled a "no warrantee if driven in the winter" clause. Shady. Very shady. Sounds a lot like a company that offers a piggyback tuning ECU, that comes with an "engine warrantee".... but only if you never actually drive the car in any conditions. (ahem)
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      09-01-2020, 10:07 AM   #8
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Quote:
Originally Posted by Ninefourteener View Post
Quote:
Originally Posted by Pumxee View Post
Unforunately, the rims I was looking at are machined aluminum, which I've been told are not suitable for winter and if I run them in winter I will void the warranty so I've scratched that plan for now and decided to just go with BR-10 Rims in 20 Diameter.
Uhhhhh... excuse me? What kind of an aftermarket rim company "doesn't offer a warrantee if they are used in the winter"??? Rims are rims. Aluminum, steel, carbon, titanium.... whatever. If they are suitable to be bolted on to a car, and safe enough to hold up the weight of that car without collapsing.... then they are suitable to be driven in the winter.

Tires? Yes. Tires make a difference between winter/summer

Wheels? Never in the 60+ cars I've owned, 14 cars I've restored, hotrodded, modified, or raced, and the 30+ years I've been working on cars.... have I EVER heard of a "Summer only wheel"... ever.

"Machined aluminum"... means basically "The exact same wheel construction as 98% of every other wheel on the planet"

That sounds like a shitty wheel company, making any excuse they can not to honor a warrantee. Perhaps they apply a substandard finish to the wheels, and after a few unhappy customers complained, they instilled a "no warrantee if driven in the winter" clause. Shady. Very shady. Sounds a lot like a company that offers a piggyback tuning ECU, that comes with an "engine warrantee".... but only if you never actually drive the car in any conditions. (ahem)
I'd be happy to agree with you but I've heard the same thing from two other wheel suppliers now. The rim in question is from DAI Art Replica. They're reputable.
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      09-25-2020, 10:09 AM   #9
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I want to swap out the stock 21 inch RFT with 275/45R21 and 315/40R21 non-RFT Michelin Tires. Key question was would this setup work with air suspension and you did the legwork for us. Thank you. I prefer taller tire side-wall.

I think in Canada we are better off with dedicated square winter tire setup - narrower tire works better on snow and you can rotate tires. I am thinking about 275/45R20 tires with replica ART wheels (winter rated, powder coated, made in Quebec, good price).

For winter which wheels and tires you guys are selecting?
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      09-25-2020, 10:21 AM   #10
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Quote:
Originally Posted by Pumxee View Post
Spoke to 2 different BMW techs and they confirmed that besides the ~3% speed change in the odometer there will be no issue with this setup.
How should we interpret ~3% speed change? Because tire circumferance will be larger with taller side-wall (I assume) would it mean the car will go ~3% slower?
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      09-25-2020, 10:31 AM   #11
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Quote:
Originally Posted by SmartSaves View Post
Quote:
Originally Posted by Pumxee View Post
Spoke to 2 different BMW techs and they confirmed that besides the ~3% speed change in the odometer there will be no issue with this setup.
How should we interpret ~3% speed change? Because tire circumferance will be larger with taller side-wall (I assume) would it mean the car will go ~3% slower?
On the contrary, the car will be traveling 3% faster than the speedo. So if you're travelling at 103 the Speedo will show 100.
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      10-10-2020, 03:58 PM   #12
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275/45/21

Hi!
Was hoping there may be some updates on this combination working. Can someone upload pictures of the tires and wheel combo you guys went with?
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      10-11-2020, 01:40 AM   #13
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Quote:
Originally Posted by ApexG5 View Post
Hi!
Was hoping there may be some updates on this combination working. Can someone upload pictures of the tires and wheel combo you guys went with?
Check this out here: OP in that thread installed Michelin Tires on OEM staggered wheels, 275/45R21 and 315/40R21.

https://g05.bimmerpost.com/forums/sh....php?t=1758397

I am considering SUV variant of the Michelin Pilot Sport 4S (Michelin Pilot Sport 4 SUV) non-RFT
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      10-16-2020, 10:37 AM   #14
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I did more digging into the sizing. There are 3 revs/mile difference on the rear tires if we change the tire wall from 40 to 45. I am not sure how this difference will impact the AWD system and wares on the tire itself. Picture below:
Attached Images
  
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      10-17-2020, 11:11 AM   #15
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Thanks that seems to be a good site. Do you mind sharing the site name.
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      10-17-2020, 11:47 AM   #16
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Originally Posted by araje View Post
Thanks that seems to be a good site. Do you mind sharing the site name.
https://tiresize.com
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      11-28-2020, 02:18 PM   #17
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Similar setup but with 22s

Looks like I'm leaning towards doing the same thing but going with a square 22" setup.

275/40/22 More tire options and comes out to be the same 30.7 height and 10.8 width.

Overall dimensions should be the same at the 275/45/21s right? Am I missing anything?
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      10-25-2021, 12:39 PM   #18
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ApexG5
Did you end up doing the 22" square set-up? Pics, updates, etc. Super curious..thanks!

Quote:
Originally Posted by ApexG5 View Post
Looks like I'm leaning towards doing the same thing but going with a square 22" setup.

275/40/22 More tire options and comes out to be the same 30.7 height and 10.8 width.

Overall dimensions should be the same at the 275/45/21s right? Am I missing anything?
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      11-21-2021, 07:45 PM   #19
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I ended up with doing a square 21" setup. 21x10.5 with et30 for perfect without any rubbing. Sitting on 295/40's all the way around.
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      11-21-2021, 07:57 PM   #20
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Some wheels may not have a coating suitable for use in winter/salt situations. Even 'raw' aluminum wheels would likely have a clear-coat on them. IF they don't, I would not want to use them in the winter, and actually, the summer, either unless they were anodized, and even then, I'd be leery about using them in the winter...coated or painted, no problem, as that's what most of them out there are.
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      12-15-2021, 04:51 PM   #21
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ApexG5
You appear to have the exact set-up I was thinking about. Correct me, it appears you put 295/40ZR21 as a Sq set-up?
* Are you on the 741m wheels?
* Do you have air suspension?
* Can you post pics or direct towards pics - want to see how the staggered set-up sidewalls look with undersized rears and oversized fronts..

Quote:
Originally Posted by ApexG5 View Post
I ended up with doing a square 21" setup. 21x10.5 with et30 for perfect without any rubbing. Sitting on 295/40's all the way around.
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      12-17-2021, 07:28 AM   #22
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Yes. I went with Vossen HF2 10.5 sq. No cost savings there 🤣.

Ditched the run flats.

No air suspension.

I'll get some pics
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