285/55R18
Standard MetricFactory Specs, Physical Dimensions & Compatible Vehicle Applications
Factory Spec Overview
The 285/55R18 tire size features an overall diameter of 30.34 inches, a section width of 11.2 inches (285mm), and rotates 665 times per mile. It is a standard factory tire fitment on 6+ vehicle models including Mercedes-Benz G55.
Physical Dimensions & Specs
Overall Diameter
30.34"
770.6 mmSection Width
285 mm
11.22" wideSidewall Height
6.17"
156.7 mm (55% aspect)Revolutions / Mile
665
Circumference: 95.32"Rim Diameter
18"
Wheel sizeRecommended Rim Width
7.1" - 10"
Optimal rim width rangeSpeedometer & Alternate Size Calculator
Testing an alternate size for your vehicle? Compare 285/55R18 against any proposed tire size below:
Popular Comparisons:
Tire 1 (Stock / Base)285/55R18
Overall Height:30.3"
Sidewall:6.2"
Revs/Mile:665
Tire 2 (New / Compare)245/60R18
Overall Height:29.6"
Sidewall:5.8"
Revs/Mile:682
Visual Tire & Wheel Comparison
Speedometer Variance
-2.5%At 60 mph reading, actual speed is 58.5 mph
| Indicated | Actual Speed | Diff |
|---|---|---|
| 20 mph | 19.5 mph | -0.5 mph |
| 30 mph | 29.2 mph | -0.8 mph |
| 45 mph | 43.9 mph | -1.1 mph |
| 60 mph | 58.5 mph | -1.5 mph |
| 75 mph | 73.1 mph | -1.9 mph |
| 90 mph | 87.7 mph | -2.3 mph |
Fender & Suspension Clearance
Fitment Status: MODERATE RISK
Flush fitment. Extends 17.7mm outwards. Check wheel arch clearance under full suspension compression.
Inner Strut Space:7.7mm LESS clearance
Outer Fender Push:Extends 17.7mm further out
Ride Height Delta:-0.38" lower ground clearance
Vehicles That Fit 285/55R18 (6+ Models)
Factory standard and optional vehicle fitments utilizing 285/55R18 tires: