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Bigger tires Info needed

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Old Feb 9, 2023 | 09:37 PM
  #1  
Benzin21's Avatar
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2014 C300
Question Bigger tires Info needed

I got 18" rims for my summer wheels and I'm shopping for tires
My stock measurements are:
Front: 225/45/17
Rear: 245/40/17

OPTION 1:
If I change them to the 18" wheels it will affect the odometer as follows:
F: 235/40/18 shows a variance of +1.72% (101.72 Km/h @ 100 Km/h)
R: 255/35/18 shows a variance of +1.25%

OPTION 2:
BUT if I use the 255/35/18 on both the variance is as follows:
F: +0.24%
R: +1.25%

Does anyone know if it is better to just keep the variance as low as possible no matter what which would be OPTION 2,
OR
Is it better to try to keep the variances as close to each other as possible which would be OPTION 1

My other worry with Option 2 is potential rubbing of the tire. Does anyone have any experience going up in the sizes that are mentioned.

Thanks!
Reply
Old Feb 11, 2023 | 02:09 AM
  #2  
Gazwould's Avatar
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S204 C250 CDI Sport
No good trying to calculate speedo differences as tyre widths and aspect ratio real world measure differently as there is manipulation at play .
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Old Feb 12, 2023 | 11:40 PM
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S70Houston's Avatar
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2018 GLC300 4Matic; 2008 ML550 4Matic; 2004 C320
Originally Posted by Benzin21
I got 18" rims for my summer wheels and I'm shopping for tires
My stock measurements are:
Front: 225/45/17
Rear: 245/40/17

OPTION 1:
If I change them to the 18" wheels it will affect the odometer as follows:
F: 235/40/18 shows a variance of +1.72% (101.72 Km/h @ 100 Km/h)
R: 255/35/18 shows a variance of +1.25%

OPTION 2:
BUT if I use the 255/35/18 on both the variance is as follows:
F: +0.24%
R: +1.25%

Does anyone know if it is better to just keep the variance as low as possible no matter what which would be OPTION 2,
OR
Is it better to try to keep the variances as close to each other as possible which would be OPTION 1

My other worry with Option 2 is potential rubbing of the tire. Does anyone have any experience going up in the sizes that are mentioned.

Thanks!
Are the 18” inch wheels OEM with the correct offset for your car? If yes, I would go with option 1, as in my opinion staggered looks better.

I have done this on a previously owned 2011 C300, removed the stock 17”s and added AMG 18”s, with no rubbing whatsoever.
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Old Feb 16, 2023 | 07:20 PM
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'13 GLK350 4matic,'10 C207,'15 GLA250,'07 Honda Odyssey, '18 GLE 43, '24 EQS 580
Originally Posted by Benzin21
I got 18" rims for my summer wheels and I'm shopping for tires
My stock measurements are:
Front: 225/45/17
Rear: 245/40/17

OPTION 1:
If I change them to the 18" wheels it will affect the odometer as follows:
F: 235/40/18 shows a variance of +1.72% (101.72 Km/h @ 100 Km/h)
R: 255/35/18 shows a variance of +1.25%

OPTION 2:
BUT if I use the 255/35/18 on both the variance is as follows:
F: +0.24%
R: +1.25%

Does anyone know if it is better to just keep the variance as low as possible no matter what which would be OPTION 2,
OR
Is it better to try to keep the variances as close to each other as possible which would be OPTION 1

My other worry with Option 2 is potential rubbing of the tire. Does anyone have any experience going up in the sizes that are mentioned.

Thanks!
Go with option 1. I am running that exact setup with zero problems.
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