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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Wheels / Tires / Suspension / Brakes Increasing side wall and total wheel size
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      04-27-2022, 02:42 AM   #1
beastmaster2k
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Increasing side wall and total wheel size

Hello all

I posted this question in the F07 forum as I own the GT, but realised it may not have been the proper place as it is a general question about wheel sizing. (Sorry for duplicate threads)

Anyway, I'm considering to upsize total diameter, by increasing the sidewall and would like to hear some opinions, or better, pictures.

The wheels are currently:
19" 245/45 Front
19" 275/40 Rear

I'm considering upsizing the tires to 245/50 (front) and 275/45 (rear) to add a little sidewall and increase total diameter.

If anyone has done something similar, I'd appreciate the input.
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      04-27-2022, 09:34 AM   #2
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You do know that this will render your speedometer inaccurate?
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      04-27-2022, 09:40 AM   #3
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Your tires will look really thick. Speed at 80mph is actually 85.7mph. That is asking for a ticket if you drive like most people (10 over limit)
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      04-27-2022, 03:40 PM   #4
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Quote:
Originally Posted by beastmaster2k View Post
Hello all

Anyway, I'm considering to upsize total diameter, by increasing the sidewall and would like to hear some opinions, or better, pictures.

The wheels are currently:
19" 245/45 Front
19" 275/40 Rear

I'm considering upsizing the tires to 245/50 (front) and 275/45 (rear) to add a little sidewall and increase total diameter.

If anyone has done something similar, I'd appreciate the input.
I did a similar thing to my F10 for winter tires. I went from stock size 245/45/18 to 245/50/18 all around. There were no issues with rubbing nor suspension clearance. Also, I had noted that my F10's speedo, when using stock tire sizes, read a little high, and when I went to the oversized tires, it actually read correctly. I verified this with both GPS and stopwatch / mile markers.
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      04-27-2022, 07:03 PM   #5
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Quote:
Originally Posted by cdmulders View Post
I did a similar thing to my F10 for winter tires. I went from stock size 245/45/18 to 245/50/18 all around. There were no issues with rubbing nor suspension clearance. Also, I had noted that my F10's speedo, when using stock tire sizes, read a little high, and when I went to the oversized tires, it actually read correctly. I verified this with both GPS and stopwatch / mile markers.
You did that with 18", OP is doing the same with 19". It's one inch higher than your setup. It's the same as if you went with 245/55/18
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      04-27-2022, 07:33 PM   #6
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Originally Posted by Hoa View Post
You did that with 18", OP is doing the same with 19". It's one inch higher than your setup. It's the same as if you went with 245/55/18
Yes, indeed, but what I do not know is the stock size for a 535GT. It might be 245/45/19 as OP mentioned for his front tires and therefore, his tire sizes already have a greater diameter than an F10. In that case, going up one size to 245/50/19 for his car would have the same effect as what I did with my winter tires for an F10. I could just as easily have increased my summer tires to 245/45/19 vice the 245/40/19 that came with my car. As an aside, OP, stock tire sizes for F10 are 245/40/19 or 245/45/18 (square setup).
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      04-28-2022, 02:01 AM   #7
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Quote:
Originally Posted by Hoa View Post
Your tires will look really thick. Speed at 80mph is actually 85.7mph. That is asking for a ticket if you drive like most people (10 over limit)
I'm aware of the speed increase, but can you explain your math? The calculator I used indicated that the speed at 80mph would be less than 83mph.
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      04-28-2022, 02:06 AM   #8
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Quote:
Originally Posted by cdmulders View Post
Yes, indeed, but what I do not know is the stock size for a 535GT. It might be 245/45/19 as OP mentioned for his front tires and therefore, his tire sizes already have a greater diameter than an F10. In that case, going up one size to 245/50/19 for his car would have the same effect as what I did with my winter tires for an F10. I could just as easily have increased my summer tires to 245/45/19 vice the 245/40/19 that came with my car. As an aside, OP, stock tire sizes for F10 are 245/40/19 or 245/45/18 (square setup).
Indeed, the specs in the original post are the standard for the 550i GT:

245/45/19
275/40/19

I would be going one step up, just as you did. Are you happy with the result? And do you have an explanation as to why the speedometer corrected itself while it should have become more incorrect, if anything?
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      04-28-2022, 07:53 AM   #9
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Quote:
Originally Posted by beastmaster2k View Post
Quote:
Originally Posted by Hoa View Post
Your tires will look really thick. Speed at 80mph is actually 85.7mph. That is asking for a ticket if you drive like most people (10 over limit)
I'm aware of the speed increase, but can you explain your math? The calculator I used indicated that the speed at 80mph would be less than 83mph.
It was based on F10 tire size. I didn't realize F07 was larger to begin with so that made it incorrect
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      04-28-2022, 09:51 AM   #10
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Quote:
Originally Posted by beastmaster2k View Post
Indeed, the specs in the original post are the standard for the 550i GT:

245/45/19
275/40/19

I would be going one step up, just as you did. Are you happy with the result? And do you have an explanation as to why the speedometer corrected itself while it should have become more incorrect, if anything?
Good questions. Regarding my satisfaction with the up-size, I was quite happy with the result. It smoothed out the ride a touch (a nice thing when you are running run-flat tires) and it provided a bit of safety on rough winter roads. It did cause some minor clearance issues however, when I lowered the car (on ACS springs) so that I ended up replacing the winter tire/wheel combo with a stock-sized set.

Regarding the speedometer, it did not correct itself. Rather, it was already reading higher than reality. I have read on this forum that BMW speedometers read, on average, 5% higher than reality. With the three BMWs I've owned, I can state that my experience matches this observation. So, when I over-sized my tires (which worked out to about a 4% increase in overall diameter and circumference) the speedometer became more accurate. Go figure!
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      05-05-2022, 05:43 AM   #11
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I did this on my F10, both with my summer and winter tires. Summer I use 275/35-20 (27.6") and winter 245/45-19 (27.7"). Stock staggered 20" were about 1" smaller diameter.

Benefits:
Fills the wheel well, looks better
Less lowering needed to eliminate fender gap
More sidewall = better ride, more wheel protection

Benefits F10:
Corrects* inaccurate speedometer (reads LOW from factory)
Corrects for optimistic fuel economy computer

Drawbacks F10:
Can cause minor rubbing on front on large compressions, especially lowered (not a big deal, use careful setup with coilovers)
4% slower in-gear acceleration (cannot feel difference), but no change in trap speed in 1/4 mile

The speedometer in the F10 reads about 3% over actual with the factory tire size, and is about 1% under actual with the 1" larger sizes. My car is now travelling about 101 km/h when I set the cruise to 100. Verified with GPS and roadside radar speed indicators.

My wife's E90 was 8% over from the factory, so upsizing her tires 1" (4% again) just got it closer, but not quite there. Yes, even with oversized tires her car still only travels 96 km/h with the speedo set to 100. Which is good, because she's driving 140 all the time.

Here's my car with oversized tires, lowered, and one pic with winters on stock suspension in the driveway:
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      05-05-2022, 05:51 AM   #12
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Here's a thread with some better pics of the car with the summer tires, I don't have these on my phone:

F10 535d LCI Canada Build https://f10.5post.com/forums/showthread.php?t=1874367
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      08-05-2022, 08:02 PM   #13
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You can use Bimmercode to program in the larger tire diameter, which will adjust the speedo. I did this when I went from stock 18's to M5 20's.
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      08-11-2022, 02:16 PM   #14
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Quote:
Originally Posted by 2013F10 View Post
You can use Bimmercode to program in the larger tire diameter, which will adjust the speedo. I did this when I went from stock 18's to M5 20's.
Just saw this post- I have a 535i Msport 6spd mnl- I got rid of my stock 19" wheels with the stock low profile run flats- am now running 20"373 wheels from a 6 series with 245 40 20 front, rears 275 35 20 non run flats. Higher sidewall, no clearance issues and the car rides so much better. Purchased a new spare donut and jack for piece of mind. 2 photos, the one next to the wall is 20", one in the lot at the dealership with 19"
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