255/40R18

Tire size lookup — every vehicle row in this catalog that lists 255/40R18 (141 references).

Use this page as a reverse index: jump to a make/model page for year-sorted context, or follow a bolt pattern link when you are also matching wheels. Trims and markets vary, so treat each row as a guide and confirm against your installed tires and manufacturer documentation.

From here you can open the tire sizes catalog or the bolt pattern catalog for broader browsing.

FAQ

What does the 255/40R18 tire marking mean?
255/40R18 is a metric tire code: section width in millimeters, aspect ratio (sidewall height as a percent of width), construction (R = radial), and rim diameter in inches. Always match load/speed ratings and verify overall diameter effects on your speedometer.
Why are several different vehicles listed for one tire size?
Many OEM applications reuse the same tire marking across makes, model years, and trims. This page groups catalog rows that reference the marking so you can compare wheel references and follow links to model-specific pages.
Is this official OEM documentation?
No—treat this dataset as a practical reference compiled from public-style fitment rows. Markets, packages, and factory options differ; verify the exact row for your VIN or tire placard before ordering.
Vehicle Year Tire Wheel Bolt
Audi A6 Avant (4G5, C7, 4GD) RS6 performance quattro2019255/40R188.5" × 19" 5×112
Audi A6 Avant (4G5, C7, 4GD) RS6 quattro2019255/40R188.5" × 19" 5×112
Audi A6 Avant (4G5, C7, 4GD) RS6 performance quattro2018255/40R188.5" × 19" 5×112
Audi A6 Avant (4G5, C7, 4GD) RS6 quattro2018255/40R188.5" × 19" 5×112
Audi A6 Avant (4G5, C7, 4GD) RS6 performance quattro2017255/40R188.5" × 19" 5×112
Audi A6 Avant (4G5, C7, 4GD) RS6 quattro2017255/40R188.5" × 19" 5×112
Audi A6 Avant (4G5, C7, 4GD) RS6 performance quattro2016255/40R188.5" × 19" 5×112
Audi A6 Avant (4G5, C7, 4GD) RS6 quattro2016255/40R188.5" × 19" 5×112
Audi A6 Avant (4G5, C7, 4GD) RS6 performance quattro2015255/40R188.5" × 19" 5×112
Audi A6 Avant (4G5, C7, 4GD) RS6 quattro2015255/40R188.5" × 19" 5×112
Audi A6 Avant (4G5, C7, 4GD) RS6 quattro2014255/40R188.5" × 19" 5×112
Audi A6 Avant (4G5, C7, 4GD) RS6 quattro2013255/40R188.5" × 19" 5×112
Mercedes CLS Shooting Brake (X218) CLS 220 BlueTEC / d2019255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 250 BlueTEC / d 4-matic2019255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 250 CDI / BlueTEC / d2019255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 3502019255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 BlueTEC / d2019255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 BlueTEC 4-matic2019255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 CDI2019255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 CDI 4-matic2019255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 d 4-matic2019255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 4002019255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 400 4-matic2019255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 5002019255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 500 4-matic2019255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 220 BlueTEC / d2018255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 250 BlueTEC / d 4-matic2018255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 250 CDI / BlueTEC / d2018255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 3502018255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 BlueTEC / d2018255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 BlueTEC 4-matic2018255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 CDI2018255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 CDI 4-matic2018255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 d 4-matic2018255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 4002018255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 400 4-matic2018255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 5002018255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 500 4-matic2018255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 220 BlueTEC / d2017255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 250 BlueTEC / d 4-matic2017255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 250 CDI / BlueTEC / d2017255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 3502017255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 BlueTEC / d2017255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 BlueTEC 4-matic2017255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 CDI2017255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 CDI 4-matic2017255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 d 4-matic2017255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 4002017255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 400 4-matic2017255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 5002017255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 500 4-matic2017255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 220 BlueTEC / d2016255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 250 BlueTEC / d 4-matic2016255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 250 CDI / BlueTEC / d2016255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 3502016255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 BlueTEC / d2016255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 BlueTEC 4-matic2016255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 CDI2016255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 CDI 4-matic2016255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 d 4-matic2016255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 4002016255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 400 4-matic2016255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 5002016255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 500 4-matic2016255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 220 BlueTEC / d2015255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 250 BlueTEC / d 4-matic2015255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 250 CDI / BlueTEC / d2015255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 3502015255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 BlueTEC / d2015255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 BlueTEC 4-matic2015255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 CDI2015255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 CDI 4-matic2015255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 d 4-matic2015255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 4002015255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 400 4-matic2015255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 5002015255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 500 4-matic2015255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 220 BlueTEC / d2014255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 250 BlueTEC / d 4-matic2014255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 250 CDI / BlueTEC / d2014255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 3502014255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 BlueTEC / d2014255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 BlueTEC 4-matic2014255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 CDI2014255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 CDI 4-matic2014255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 4002014255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 400 4-matic2014255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 5002014255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 500 4-matic2014255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 250 CDI / BlueTEC / d2013255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 3502013255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 CDI2013255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 CDI 4-matic2013255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 5002013255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 500 4-matic2013255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 250 CDI / BlueTEC / d2012255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 3502012255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 CDI2012255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 350 CDI 4-matic2012255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 5002012255/40R188.5" × 18" 5×112
Mercedes CLS Shooting Brake (X218) CLS 500 4-matic2012255/40R188.5" × 18" 5×112
Mercedes CLS-Class (C218) CLS 5002019255/40R188.5" × 18" 5×112
Mercedes CLS-Class (C218) CLS 500 4-matic2019255/40R188.5" × 18" 5×112
Mercedes CLS-Class (C218) CLS 5002018255/40R188.5" × 18" 5×112
Mercedes CLS-Class (C218) CLS 500 4-matic2018255/40R188.5" × 18" 5×112
Mercedes CLS-Class (C218) CLS 5002017255/40R188.5" × 18" 5×112
Mercedes CLS-Class (C218) CLS 500 4-matic2017255/40R188.5" × 18" 5×112
Mercedes CLS-Class (C218) CLS 5002016255/40R188.5" × 18" 5×112
Mercedes CLS-Class (C218) CLS 500 4-matic2016255/40R188.5" × 18" 5×112
Mercedes CLS-Class (C218) CLS 5002015255/40R188.5" × 18" 5×112
Mercedes CLS-Class (C218) CLS 500 4-matic2015255/40R188.5" × 18" 5×112
Mercedes CLS-Class (C218) CLS 5002014255/40R188.5" × 18" 5×112
Mercedes CLS-Class (C218) CLS 500 4-matic2014255/40R188.5" × 18" 5×112
Mercedes CLS-Class (C218) CLS 5002013255/40R188.5" × 18" 5×112
Mercedes CLS-Class (C218) CLS 500 4-matic2013255/40R188.5" × 18" 5×112
Mercedes CLS-Class (C218) CLS 5002012255/40R188.5" × 18" 5×112
Mercedes CLS-Class (C218) CLS 500 4-matic2012255/40R188.5" × 18" 5×112
Mercedes CLS-Class (C218) CLS 5002011255/40R188.5" × 18" 5×112
Mercedes CLS-Class (C218) CLS 500 4-matic2011255/40R188.5" × 18" 5×112
Mercedes SL-Class (R230) 5002012255/40R188.5" × 18" 5×112
Mercedes SL-Class (R230) 6002012255/40R188.5" × 18" 5×112
Mercedes SL-Class (R230) 5002011255/40R188.5" × 18" 5×112
Mercedes SL-Class (R230) 6002011255/40R188.5" × 18" 5×112
Mercedes SL-Class (R230) 5002010255/40R188.5" × 18" 5×112
Mercedes SL-Class (R230) 6002010255/40R188.5" × 18" 5×112
Mercedes SL-Class (R230) 5002009255/40R188.5" × 18" 5×112
Mercedes SL-Class (R230) 6002009255/40R188.5" × 18" 5×112
Mercedes SL-Class (R230) 5002008255/40R188.5" × 18" 5×112
Mercedes SL-Class (R230) 6002008255/40R188.5" × 18" 5×112
Mercedes SL-Class (R230) 5002007255/40R188.5" × 18" 5×112
Mercedes SL-Class (R230) 6002007255/40R188.5" × 18" 5×112
Mercedes SL-Class (R230) 5002006255/40R188.5" × 18" 5×112
Mercedes SL-Class (R230) 6002006255/40R188.5" × 18" 5×112
Mercedes SL-Class (R230) 5002005255/40R188.5" × 18" 5×112
Mercedes SL-Class (R230) 6002005255/40R188.5" × 18" 5×112
Mercedes SL-Class (R230) 5002004255/40R188.5" × 18" 5×112
Mercedes SL-Class (R230) 6002004255/40R188.5" × 18" 5×112
Mercedes SL-Class (R230) 5002003255/40R188.5" × 18" 5×112
Mercedes SL-Class (R230) 6002003255/40R188.5" × 18" 5×112
Mercedes SL-Class (R230) 5002002255/40R188.5" × 18" 5×112
Mercedes SL-Class (R230) 5002001255/40R188.5" × 18" 5×112
Tire size calculatorShow

Compare two tire sizes — diameter, speedometer error, and clearance change.

inchmm
Size 1Size 2DiffDiff(%)
Diameter25.0"25.4"0.5"1.89%
Width7.7"8.5"0.8"10.26%
Circumference78.4"79.9"1.5"1.86%
Profile height5.0"4.2"-0.7"-15.08%
Turnover per mile80779314-1.73%
Clearance--+0.2"-
25.0"
7.7"
old tire side
25.5"
8.5"
new tire side
old tire
15"
old rim
5.0"
new tire
17"
new rim
4.2"

Speedometer Error

(First wheel OEM size)

Reading20 mph30 mph40 mph50 mph60 mph70 mph80 mph90 mph
Actual20.430.540.750.961.171.281.491.6