[Cschules-535I]

Hey y’all,
I just put on some 245/35/19 on some 19x9.5 with 10mm spacers in the front and I put some 285/35/20 on some 20x10.5 on the rear both with 35mm offsets and I’m running into some error codes is this normal? Is there a way I can remove the error codes and tune my speedometer to cope with the staggered offsets ? These went on an F10 535I I’m not having any running issues in the front or rear.
Thank y’all for any information y’all may have !

[lsturbointeg]

what codes are you getting? usually with xdrive if you're more than i think 1% rolling diameter you can get errors but on a RWD?

[top ramen]

So you got 19" fronts and 20" rear, correct? If that is so your setup is messed up and that's why your car is throwing codes. Your speedo is off by 7.8% and recommend max diameter difference is plus or minus 2.5%. Yours is at 8.26%

Where did you get this setup from?

Check your setup here if you want to see for yourself.

Calculate errors
https://www.errolstyres.co.za/odcalculator
Tire size comparison
https://tiresize.com/calculator/
Speed reading
https://www.discounttire.com/learn/tire-size-calculator

[cdmulders]

Yep, I was more polite on another thread, but this setup is indeed messed up. His tire overall diameter difference is 8% between front and back. I used wheel size.com calculator here:

WheelSize.com

[Cschules-535I]

Originally Posted by lsturbointeg

what codes are you getting? usually with xdrive if you're more than i think 1% rolling diameter you can get errors but on a RWD?

I don’t know the codes off the top of my head but I can surely get them later! I didn’t think I’d get any codes since everything I read on this site didn’t mention anything about staying within 1% of the original set up.

[Cschules-535I]

Originally Posted by top ramen

So you got 19" fronts and 20" rear, correct? If that is so your setup is messed up and that's why your car is throwing codes. Your speedo is off by 7.8% and recommend max diameter difference is plus or minus 2.5%. Yours is at 8.26%

Where did you get this setup from?

I pieced this set up off a picture I saw on google and liked the way it looked with it being staggered. Is there a way I can “tune” it to work ?

[lsturbointeg]

Originally Posted by top ramen

So you got 19" fronts and 20" rear, correct? If that is so your setup is messed up and that's why your car is throwing codes. Your speedo is off by 7.8% and recommend max diameter difference is plus or minus 2.5%. Yours is at 8.26%

Where did you get this setup from?

Check your setup here if you want to see for yourself.

Calculate errors
https://www.errolstyres.co.za/odcalculator
Tire size comparison
https://tiresize.com/calculator/
Speed reading
https://www.discounttire.com/learn/tire-size-calculator

Damn I'm blind. Didn't even catch the different size rims

[ezaircon4jc]

Originally Posted by Cschules-535I

I pieced this set up off a picture I saw on google and liked the way it looked with it being staggered. Is there a way I can “tune” it to work ?

Doubt it. You're seriously messing with the ABS, odometer and speed sensors. Can't code that much discrepancy. You need to change the tires SAP! I did a little search and here are your options:

https://www.1010tires.com/Tools/Tire-Size-Calculator
Tire Size Min Max Diameter

235/30R20 8.00in 8.50in 25.55" -0.78%
285/25R20 10.00in 11.00in 25.61" -0.55%
245/30R20 8.00in 9.50in 25.79" 0.14%
295/25R20 10.00in 11.00in 25.81" 0.21%
185/40R20 - - 25.83" 0.29%
215/35R20 - - 25.93" 0.67%
305/25R20 10.50in 12.00in 26.00" 0.98%

[Cschules-535I]

Originally Posted by ezaircon4jc

Doubt it. You're seriously messing with the ABS, odometer and speed sensors. Can't code that much discrepancy. You need to change the tires SAP! I did a little search and here are your options:

https://www.1010tires.com/Tools/Tire-Size-Calculator
Tire Size Min Max Diameter

235/30R20 8.00in 8.50in 25.55" -0.78%
285/25R20 10.00in 11.00in 25.61" -0.55%
245/30R20 8.00in 9.50in 25.79" 0.14%
295/25R20 10.00in 11.00in 25.81" 0.21%
185/40R20 - - 25.83" 0.29%
215/35R20 - - 25.93" 0.67%
305/25R20 10.50in 12.00in 26.00" 0.98%

So I don’t know much about tire sizes and much unfortunately, so I have 285/35/20r on the rear and from what I’m seeing from what you sent. I could go up in the fronts to a 20x8-8.5 with a 235/30/20r is there a way I can go up to 35 for the sidewalk width or would that be pushing it ?

[ezaircon4jc]

Originally Posted by Cschules-535I

So I don’t know much about tire sizes and much unfortunately, so I have 285/35/20r on the rear and from what I’m seeing from what you sent. I could go up in the fronts to a 20x8-8.5 with a 235/30/20r is there a way I can go up to 35 for the sidewalk width or would that be pushing it ?

Just go to the site and enter your tire sizes. Make sure you stay within 1%-2% of the factory size; I would use 245/45/18 as the base size.

Here are a few; just plug in the factory size and then the new size you want...

https://tiresize.com/calculator/

https://www.discounttire.com/learn/tire-size-calculator

https://www.sizemytires.com/calculators/compare

[Cschules-535I]

Originally Posted by ezaircon4jc

Just go to the site and enter your tire sizes. Make sure you stay within 1%-2% of the factory size; I would use 245/45/18 as the base size.

Here are a few; just plug in the factory size and then the new size you want...

https://tiresize.com/calculator/

https://www.discounttire.com/learn/tire-size-calculator

https://www.sizemytires.com/calculators/compare

So for these calculations are you comparing front to front tires and rears to rears or are you trying to compare the sizes of fronts and rears of the stock set to fronts and rears of the new set ? Also i had the M Sport package with 19" wheels that were stock. So I've been using 245/35/19R for the fronts and 275/35/19R for the rears.
For me to keep the wheels that I have I'll go with the same size for the fronts and for the rear I'll use 285/30/20R can one of yall double check to make sure this is right so I don't mess this up again XD

[ezaircon4jc]

Originally Posted by Cschules-535I

So for these calculations are you comparing front to front tires and rears to rears or are you trying to compare the sizes of fronts and rears of the stock set to fronts and rears of the new set ? Also i had the M Sport package with 19" wheels that were stock. So I've been using 245/35/19R for the fronts and 275/35/19R for the rears.
For me to keep the wheels that I have I'll go with the same size for the fronts and for the rear I'll use 285/30/20R can one of yall double check to make sure this is right so I don't mess this up again XD

The factory front should be 245/40/19. The 20" size you should get is 285/30/20. That's a whopping .15% difference; WELL within tolerance. I would be carfull to keep the same brand, model and tread pattern to avoid the possibility of any squirrely handling.

If you are sure you have a 245/35/19 up front, you would need 295/25/20 (also a .15% difference).

[Cschules-535I]

Originally Posted by ezaircon4jc

The factory front should be 245/40/19. The 20" size you should get is 285/30/20. That's a whopping .15% difference; WELL within tolerance. I would be carfull to keep the same brand, model and tread pattern to avoid the possibility of any squirrely handling.

If you are sure you have a 245/35/19 up front, you would need 295/25/20 (also a .15% difference).

So I found that a 245/45/19R with 285/35/20R will be +0.7% of difference between the two. Since this is less than 1%-2% this would be within tolerance ?

[ChiNorm]

Originally Posted by Cschules-535I

I pieced this set up off a picture I saw on google and liked the way it looked with it being staggered. Is there a way I can “tune” it to work ?

Everything I have been told by BMW or read is that you are 'tuning for smoke'.

[Cschules-535I]

Originally Posted by ChiNorm

Everything I have been told by BMW or read is that you are 'tuning for smoke'.

Smokin tires or piston rings?

[ChiNorm]

IIRC Differentials. A dealership service manager said they are VERY sensitive to the overall diameter of the tires front vs. back.

[Cschules-535I]

Originally Posted by ChiNorm

IIRC Differentials. A dealership service manager said they are VERY sensitive to the overall diameter of the tires front vs. back.

Thanks for the info! Did he tell you what guidelines to stay in? Did he give you any other information regarding this?

[cdmulders]

Originally Posted by ezaircon4jc

Just go to the site and enter your tire sizes. Make sure you stay within 1%-2% of the factory size; I would use 245/45/18 as the base size.

OK, after my quarantini for today, I might be a little verbose.

Cschules-535I, ezaircon4jc gave you good advice. You are messing around with tire sizes, and in particular, tire diameters, that are straying from what BMW intended. Every normal setup, whatever the wheel size and tread width, keeps roughly the same tire diameter, for both front and rear. If you mess around with that, particularly when you change the front from the rear, then you get issues with xDrive if the difference is more than 1%. Given your error codes, it also looks like you get issues with ABS & traction control if you stray a significant amount like you have done with an 8% difference between front and rear.

As stated, go to a tire calculator, and look for equivalent tires to 245/45/18 (or 245/40/19 which is stock for the OEM 351M wheels your picture shows). Then go from there. 'Tuning' the tires as you've said elsewhere is just going to ignore a very real problem with improper tire sizes. As I said in the other thread you started, both your front and rear tires that you chose are not normal BMW-recommended diameters. The fronts are too small, and the rears are too large. Changing just one or the other will solve the front/rear differential problem, but then you still will have either undersized or oversized tires all around.

As an aside, since it might be this that is causing you confusion (and you are not the only one), the '35' in a tire size (245/35/19 for example) is NOT a dimension. It is a ratio. It means that the sidewall height is 35% of the tread width. With the example of 245/35/19, it means the sidewall height is 35% of 245mm.

[top ramen]

My recommendation is not trying to find the right tire size but to get the same size rim all around four corners. If you're trying to find the correct tire size to get it in spec and once you do find that setup it's going to look weird as hell. The rears are going to have a thinner sidewall and the fronts are going to have a thicker side walls.

So best decision is what do you want to stick with 20" or 19".

[ezaircon4jc]

Originally Posted by top ramen

My recommendation is not trying to find the right tire size but to get the same size rim all around four corners. If you're trying to find the correct tire size to get it in spec and once you do find that setup it's going to look weird as hell. The rears are going to have a thinner sidewall and the fronts are going to have a thicker side walls.

So best decision is what do you want to stick with 20" or 19".

Quite a few performance cars use different size front & rear wheels. With the correct sizes, the sidewall differences should be unnoticeable to the eye.

[Broalmightee]

Houston roads had me shopping for Wranglers, but I'm not ready to part with my F10. I'm looking to put 295/45/20 for my rear tires, and 265/45/20 for my front Is that the thickest sidewall that will fit on the 2011 535i?

[Lesley76]

I would really like to see some pics of this setup.
Hope you can get it sorted out.