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Discussion Starter · #1 · (Edited)
Anyone had any experience with "Transmission Malfunction" when putting aftermarket wheels on a Urus or any other model for that matter? Car drives completely fine and the dealer said it was because I have 23's vs. the stock 22's. That makes ZERO sense. They said it's fine to drive just ignore the error. The 23's only throw an error code after 2,000 miles and had a flat tire (run flats) and the car was driven very slowly for a mile. Any help or thoughts would be much appreciated. Again, car works fine but I despise error codes and my local dealer seems to be unable in correcting the error. It's a 2020 Urus under warranty only 2,3xx miles. The Vossen 23's tire specs are the same as the stock 23's just wider,. TPMS were calibrated, balanced etc.. and worked fine until the flat tire. Am I missing something or just being bs'd??

Thanks!

Erik
 

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Definitely not "fine" if you're getting a transmission error on the dash (At All) and yes, yes, YES the mere 1" inch difference can make a drastic difference in these cars (including Ferrari's)

I can tell you that from experience. On a Gallardo, changing so much from 19" to 20" with the wrong tires and offset will have you with a worn clutch 50% faster than riding on stock rims..

You have to make sure it's the right off set but more important the right tires. Tires are everything when upgrading to aftermarket.

What exact rims & tires do you have. You can call RDBLA in los angeles and ask them for their opinion/help. They do 23" inch wheels on those cars all the time.

As for aftermarket rims, I don't put anything else on my cars but forgiato's.
 

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Discussion Starter · #3 ·
Vossen 23 inch wheels, Continental Sport Contact 6 tires
Front: 295/35/23 (Stock 285/35/23)
Rear: 335/30/23 (Stock 325/30/23)
It took basically over 2K miles to produce an error, only after I had a flat tire. I barely drive about 100 miles a week...
 

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It's not the offset, it's the correct rolling diameter. If the rolling diameter is too great, you will burn up your diff's and trans. Since you have a trans error, you might already have damage. I would put the stock rims back on, change the trans and diff fluids and hope for the best until you can get the proper set up on.
 

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I heard that early Urus models had this issue and it was something that needs to get programmed. RDBLA mentioned it as well on a video. The newer models it doesn't have this issue. However what GDF mentioned above is 100% accurate. My understanding is the tire size up front has to be pretty much in alignment w/ the tire in the rear. This goes with any lambo that is AWD. The RWD don't have this issue.

TJ Hunt made a video as well in regards to his lambo and why it has to have certain tire sizes to match and balance the rolling diameter.
 
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It is the overall height of the wheel/tire combo resulting in "x" amount of revolutions per mile per hour. If the height and revolutions are off be a certain degree, +/- 2-3%, you have too much of a difference and can destroy your differentials and transmission. This applies only to cars/trucks with AWD. There are online tire calculators available to know if you are within the correct ratio.
 

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It is the overall height of the wheel/tire combo resulting in "x" amount of revolutions per mile per hour. If the height and revolutions are off be a certain degree, +/- 2-3%, you have too much of a difference and can destroy your differentials and transmission. This applies only to cars/trucks with AWD. There are online tire calculators available to know if you are within the correct ratio.
Dam thank you for that. Do you happen to know what exact tires go on a gallardo that will have 20 inch wheels?
 

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Discussion Starter · #9 ·
It is the overall height of the wheel/tire combo resulting in "x" amount of revolutions per mile per hour. If the height and revolutions are off be a certain degree, +/- 2-3%, you have too much of a difference and can destroy your differentials and transmission. This applies only to cars/trucks with AWD. There are online tire calculators available to know if you are within the correct ratio.
@GDF my height of the tire is the same as the book says it's just the width, which I think would NOT effect the rolling diameter, but could be wrong.... My car did come with 22's with a higher height ratio for the side wall with the smaller wheel. Could they re-calibrate to a 23 stock even though the car came with 22's?

Front: 295/35/23 (Book says Stock 285/35/23)
Rear: 335/30/23 (Book says Stock 325/30/23)
 

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Discussion Starter · #14 ·
My local dealer cleared the code after I explained to them again today and no issues thus far. They said it's fine even on the transmission with the slightly wider tire, the run flat that was driven one a mile triggered the code. FYI ALL if you run on a run flat or even a spare it can throw the code, which is what I suspected. I will continue to monitor
 
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