285/55R18
Standard MetricFactory Specs, Physical Dimensions & Compatible Vehicle Applications
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 rangeWhere to Buy & Install 285/55R18 Tires
Looking for 285/55R18 tires? Skip hauling tires in your car—choose direct delivery to a local certified shop or doorstep delivery:
Tire Rack
Free shipping directly to over 10,000+ certified local installers.
- ✓Delivered to local installer (Firestone, Discount Tire & local shops)
- ✓Mobile installation available — mount & balance right in your driveway
- ✓Free 2-year road hazard warranty on most eligible tire models
Amazon Automotive
Fast doorstep shipping for DIYers or bringing to your own shop.
- ✓Prime doorstep shipping for home garages or spares
- ✓Huge range of budget and specialty tire sizes in stock
- ✓Ideal if you have a local independent mechanic you prefer
As an affiliate for Tire Rack and Amazon, we earn from qualifying purchases at no extra cost to you.
Speedometer & Alternate Size Calculator
Testing an alternate size for your vehicle? Compare 285/55R18 against any proposed tire size below:
Visual Tire & Wheel Comparison
Speedometer Variance
| 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
Flush fitment. Extends 17.7mm outwards. Check wheel arch clearance under full suspension compression.
Vehicles That Fit 285/55R18 (6+ Models)
Factory standard and optional vehicle fitments utilizing 285/55R18 tires: