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      12-06-2018, 08:42 PM   #1
flaury23
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Widest Tires For Stock Wheels

What is the widest tires we can put on the non competition rims? I'm considering 305s for the rear.
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      12-06-2018, 09:40 PM   #2
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Quote:
Originally Posted by flaury23 View Post
What is the widest tires we can put on the non competition rims? I'm considering 305s for the rear.
What would be the front?

If you put 305 on the back the front needs to be 295 to be within 1.3% Circum.

But 295 needs to be on 10" rim and your's are 9.5"

You can put 285 front and 305 back on stock rims and that will push it up to 1.8%

Some people are ok with 1.8%
I prefer to be 1.3 or less
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      12-06-2018, 10:17 PM   #3
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Quote:
Originally Posted by Miko M View Post
Quote:
Originally Posted by flaury23 View Post
What is the widest tires we can put on the non competition rims? I'm considering 305s for the rear.
What would be the front?

If you put 305 on the back the front needs to be 295 to be within 1.3% Circum.

But 295 needs to be on 10" rim and your's are 9.5"

You can put 285 front and 305 back on stock rims and that will push it up to 1.8%

Some people are ok with 1.8%
I prefer to be 1.3 or less
305/30/20?
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      12-07-2018, 05:31 AM   #4
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Quote:
Originally Posted by flaury23 View Post
Quote:
Originally Posted by Miko M View Post
Quote:
Originally Posted by flaury23 View Post
What is the widest tires we can put on the non competition rims? I'm considering 305s for the rear.
What would be the front?

If you put 305 on the back the front needs to be 295 to be within 1.3% Circum.

But 295 needs to be on 10" rim and your's are 9.5"

You can put 285 front and 305 back on stock rims and that will push it up to 1.8%

Some people are ok with 1.8%
I prefer to be 1.3 or less
305/30/20?
You can put 305/30/[COLOR="Blue"]20[/COLOR] but you need 285/35/[COLOR="Blue"]19[/COLOR]up front. That would work and it's 1.1%
You still need to switch the front rims one size down in diameter
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      12-07-2018, 08:48 AM   #5
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I don't have to worry about this until Spring, but I'm trying to figure out what I want to do here as well. I was running 305 rears on my M6, so ideally I'd like to go that wide (or wider) here, but the AWD limiting the diameter differences makes things tricky.....
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      12-07-2018, 09:13 AM   #6
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Quote:
Originally Posted by devondragon View Post
I don't have to worry about this until Spring, but I'm trying to figure out what I want to do here as well. I was running 305 rears on my M6, so ideally I'd like to go that wide (or wider) here, but the AWD limiting the diameter differences makes things tricky.....
Tell me the size you want on the back, and I will do the math for you and tell you what front needs to be.
I can tell you what tire hight and rim width needs to be
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      12-07-2018, 09:26 AM   #7
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Quote:
Originally Posted by Miko M View Post
Quote:
Originally Posted by flaury23 View Post
Quote:
Originally Posted by Miko M View Post
Quote:
Originally Posted by flaury23 View Post
What is the widest tires we can put on the non competition rims? I'm considering 305s for the rear.
What would be the front?

If you put 305 on the back the front needs to be 295 to be within 1.3% Circum.

But 295 needs to be on 10" rim and your's are 9.5"

You can put 285 front and 305 back on stock rims and that will push it up to 1.8%

Some people are ok with 1.8%
I prefer to be 1.3 or less
305/30/20?
You can put 305/30/[COLOR="Blue"]20[/COLOR] but you need 285/35/[COLOR="Blue"]19[/COLOR]up front. That would work and it's 1.1%
You still need to switch the front rims one size down in diameter
Is there a 305/30/20 scenario that would allow a 20" tire in the front?

I'm trying to achieve maximum traction (using Mp4s) but stay in the acceptable xdrive tolerance.
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      12-07-2018, 09:54 AM   #8
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Quote:
Originally Posted by flaury23 View Post
Quote:
Originally Posted by Miko M View Post
Quote:
Originally Posted by flaury23 View Post
Quote:
Originally Posted by Miko M View Post
Quote:
Originally Posted by flaury23 View Post
What is the widest tires we can put on the non competition rims? I'm considering 305s for the rear.
What would be the front?

If you put 305 on the back the front needs to be 295 to be within 1.3% Circum.

But 295 needs to be on 10" rim and your's are 9.5"

You can put 285 front and 305 back on stock rims and that will push it up to 1.8%

Some people are ok with 1.8%
I prefer to be 1.3 or less
305/30/20?
You can put 305/30/[COLOR="Blue"]20[/COLOR] but you need 285/35/[COLOR="Blue"]19[/COLOR]up front. That would work and it's 1.1%
You still need to switch the front rims one size down in diameter
Is there a 305/30/20 scenario that would allow a 20" tire in the front?

I'm trying to achieve maximum traction (using Mp4s) but stay in the acceptable xdrive tolerance.
No, that would make it worse -2.5%

Again you can put 305/35/20 back and 285/35/20 front that would be 1.8%
I have seen people on this forum using this setup
I like to stay below 1.3%

I am going to post mine as soon as a decide what rims and offset I will go with
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      12-07-2018, 11:05 AM   #9
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Here is something I made for you guys

https://www.bimmerpost.com/forums/sh...php?p=24084716
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      02-15-2019, 07:04 PM   #10
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I'd like to run 285/295's on factory rims in 2 months.
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      02-21-2019, 05:46 PM   #11
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Quote:
Originally Posted by Miko M View Post
Here is something I made for you guys

https://www.bimmerpost.com/forums/sh...php?p=24084716
So, Do you see an issue running:
Front- 285/35/20
Rear- 295/35/20

Thanks
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      02-21-2019, 06:27 PM   #12
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Quote:
Originally Posted by Who's on first View Post
Quote:
Originally Posted by Miko M View Post
Here is something I made for you guys

https://www.bimmerpost.com/forums/sh...php?p=24084716
So, Do you see an issue running:
Front- 285/35/20
Rear- 295/35/20

Thanks
You are perfectly fine with that size
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      02-22-2019, 06:50 AM   #13
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Quote:
Originally Posted by Miko M View Post
Quote:
Originally Posted by Who's on first View Post
Quote:
Originally Posted by Miko M View Post
Here is something I made for you guys

https://www.bimmerpost.com/forums/sh...php?p=24084716
So, Do you see an issue running:
Front- 285/35/20
Rear- 295/35/20

Thanks
You are perfectly fine with that size
Even on factory wheels?
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      02-22-2019, 07:52 AM   #14
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Quote:
Originally Posted by Who's on first View Post
Quote:
Originally Posted by Miko M View Post
Quote:
Originally Posted by Who's on first View Post
Quote:
Originally Posted by Miko M View Post
Here is something I made for you guys

https://www.bimmerpost.com/forums/sh...php?p=24084716
So, Do you see an issue running:
Front- 285/35/20
Rear- 295/35/20

Thanks
You are perfectly fine with that size
Even on factory wheels?
Yes
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      02-22-2019, 08:54 AM   #15
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Quote:
Originally Posted by Who's on first View Post
So, Do you see an issue running:
Front- 285/35/20
Rear- 295/35/20

Thanks

This is what I think I am going with as well. I really wanted a 305 rear but Michelin doesnt make a 305/35. Only a 305/30 or a 305/25. Id really like a more robust sidewall so I think Im going with a 295/35. I will give up .4 inch in tread width compared to a 305 but everything else falls into line.
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      05-14-2019, 08:36 AM   #16
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Quote:
Originally Posted by Miko M View Post
Quote:
Originally Posted by flaury23 View Post
Quote:
Originally Posted by Miko M View Post
Quote:
Originally Posted by flaury23 View Post
Quote:
Originally Posted by Miko M View Post
Quote:
Originally Posted by flaury23 View Post
What is the widest tires we can put on the non competition rims? I'm considering 305s for the rear.
What would be the front?

If you put 305 on the back the front needs to be 295 to be within 1.3% Circum.

But 295 needs to be on 10" rim and your's are 9.5"

You can put 285 front and 305 back on stock rims and that will push it up to 1.8%

Some people are ok with 1.8%
I prefer to be 1.3 or less
305/30/20?
You can put 305/30/[COLOR="Blue"]20[/COLOR] but you need 285/35/[COLOR="Blue"]19[/COLOR]up front. That would work and it's 1.1%
You still need to switch the front rims one size down in diameter
Is there a 305/30/20 scenario that would allow a 20" tire in the front?

I'm trying to achieve maximum traction (using Mp4s) but stay in the acceptable xdrive tolerance.
No, that would make it worse -2.5%

Again you can put 305/35/20 back and 285/35/20 front that would be 1.8%
I have seen people on this forum using this setup
I like to stay below 1.3%

I am going to post mine as soon as a decide what rims and offset I will go with
This scenario puts me at 1.8%.....thoughts?
305/30/20
285/30/20
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      05-14-2019, 08:42 AM   #17
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Quote:
Originally Posted by flaury23 View Post
Quote:
Originally Posted by Miko M View Post
Quote:
Originally Posted by flaury23 View Post
Quote:
Originally Posted by Miko M View Post
Quote:
Originally Posted by flaury23 View Post
Quote:
Originally Posted by Miko M View Post
Quote:
Originally Posted by flaury23 View Post
What is the widest tires we can put on the non competition rims? I'm considering 305s for the rear.
What would be the front?

If you put 305 on the back the front needs to be 295 to be within 1.3% Circum.

But 295 needs to be on 10" rim and your's are 9.5"

You can put 285 front and 305 back on stock rims and that will push it up to 1.8%

Some people are ok with 1.8%
I prefer to be 1.3 or less
305/30/20?
You can put 305/30/[COLOR="Blue"]20[/COLOR] but you need 285/35/[COLOR="Blue"]19[/COLOR]up front. That would work and it's 1.1%
You still need to switch the front rims one size down in diameter
Is there a 305/30/20 scenario that would allow a 20" tire in the front?

I'm trying to achieve maximum traction (using Mp4s) but stay in the acceptable xdrive tolerance.
No, that would make it worse -2.5%

Again you can put 305/35/20 back and 285/35/20 front that would be 1.8%
I have seen people on this forum using this setup
I like to stay below 1.3%

I am going to post mine as soon as a decide what rims and offset I will go with
This scenario puts me at 1.8%.....thoughts?
305/30/20
285/30/20
Will work fine.
Stocks are off at 1.1% so differential are calibrated for that... in reality you are off only 0.7%
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      05-14-2019, 08:50 AM   #18
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Quote:
Originally Posted by Miko M View Post
Quote:
Originally Posted by flaury23 View Post
Quote:
Originally Posted by Miko M View Post
Quote:
Originally Posted by flaury23 View Post
Quote:
Originally Posted by Miko M View Post
Quote:
Originally Posted by flaury23 View Post
Quote:
Originally Posted by Miko M View Post
Quote:
Originally Posted by flaury23 View Post
What is the widest tires we can put on the non competition rims? I'm considering 305s for the rear.
What would be the front?

If you put 305 on the back the front needs to be 295 to be within 1.3% Circum.

But 295 needs to be on 10" rim and your's are 9.5"

You can put 285 front and 305 back on stock rims and that will push it up to 1.8%

Some people are ok with 1.8%
I prefer to be 1.3 or less
305/30/20?
You can put 305/30/[COLOR="Blue"]20[/COLOR] but you need 285/35/[COLOR="Blue"]19[/COLOR]up front. That would work and it's 1.1%
You still need to switch the front rims one size down in diameter
Is there a 305/30/20 scenario that would allow a 20" tire in the front?

I'm trying to achieve maximum traction (using Mp4s) but stay in the acceptable xdrive tolerance.
No, that would make it worse -2.5%

Again you can put 305/35/20 back and 285/35/20 front that would be 1.8%
I have seen people on this forum using this setup
I like to stay below 1.3%

I am going to post mine as soon as a decide what rims and offset I will go with
This scenario puts me at 1.8%.....thoughts?
305/30/20
285/30/20
Will work fine.
Stocks are off at 1.1% so differential are calibrated for that... in reality you are off only 0.7%
OK great! I'm currently running 15/12 spacers. Any issues you have encountered with guys running spacers and plus size tires.... Rubbing, etc.
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      05-14-2019, 09:56 AM   #19
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If you run stock offset you should be fine
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      05-14-2019, 11:04 AM   #20
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According to this post you can use whatever tire size you like as long as you configure it via iDrive, has anyone done this yet?

https://f90.bimmerpost.com/forums/sh...0&postcount=11
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      05-18-2019, 05:31 PM   #21
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That’s for the tpms not AWD differentials.
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      11-18-2022, 08:34 PM   #22
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Quote:
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If you run stock offset you should be fine
Miko, I hate to bring this forum back to life, but I just picked up my F90 M5 Comp. It has the 789M wheels. I want to run a 305/30/20 in the rear. Is this possible with a stock 275/35/20 up front, without causing differential problems? Sorry, I could not find this request above.

Or is it possible to run a 265/35/20 up front and a 275/35/20 in the rear? Asking based on tire sizes that my company has in stock...

Thanks!
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