Tire fitment
The 2023 Mercedes-Benz C-Class base tire size is 225/45R18 — 225 mm wide with a 45% aspect ratio on 18″ rims. 4 OEM sizes are available across trims.
2023 Mercedes-Benz C-Class
225/45R1826″ overall diameter · 101.3 mm sidewall · ~777 rev/mi
| Trim | Tire size | Rim | Diameter | vs Base |
|---|---|---|---|---|
| C 300 (front) ★ | 225/45R18 | 7.5×18″ | 26″ (659.7 mm) | — |
| C 300 (rear) | 245/40R18 | 8.5×18″ | 25.7″ (653.2 mm) | -0.99% |
| AMG C 43 (front) | 245/40R19 | 8×19″ | 26.7″ (678.6 mm) | +2.86% |
| AMG C 43 (rear) | 265/35R19 | 9.5×19″ | 26.3″ (668.1 mm) | +1.27% |
Staggered: 225/45R18 front, 245/40R18 rear. Staggered: 245/40R19 front, 265/35R19 rear.
The 2023 Mercedes-Benz C-Class ships with 225/45R18 tires on the base trim — that's an overall diameter of 26″. The 225 mm width and 45% sidewall ratio give you 101.3 mm of sidewall cushion between the rim and the road.
Match the load index and speed rating from your door-jamb placard — not just the size. If you're switching sizes, keep the overall diameter within ~3% to avoid speedometer error and potential ABS/traction-control issues.
Factory fitment for the 2023 Mercedes-Benz C-Class; verify against your door-jamb placard or owner's manual.
The base 2023 Mercedes-Benz C-Class uses 225/45R18 tires — 225 mm wide, 45% aspect ratio, on 18-inch rims. The overall diameter is 26″ (659.7 mm). Higher trims use different sizes — see the table above. Confirm against your door-jamb placard.
Yes, within limits. Keep the overall diameter within about 3% of 26″ to avoid speedometer error and clearance issues. A wider tire may improve grip, but match the load and speed ratings your C-Class requires.
225/45R18 tires have an overall diameter of 26″ (659.7 mm), with a 101.3 mm sidewall height. That's about 777 revolutions per mile.
The 2023 Mercedes-Benz C-Class tire sizes shown are OEM factory fitments. Confirm your exact tire size, load rating, and speed rating against the door-jamb placard or owner's manual before buying tires.