255/55R18
Standard MetricFactory Specs, Physical Dimensions & Compatible Vehicle Applications
The 255/55R18 tire size features an overall diameter of 29.04 inches, a section width of 10.0 inches (255mm), and rotates 694 times per mile. It is a standard factory tire fitment on 150+ vehicle models including Acura MDX.
Physical Dimensions & Specs
Overall Diameter
29.04"
737.6 mmSection Width
255 mm
10.04" wideSidewall Height
5.52"
140.2 mm (55% aspect)Revolutions / Mile
694
Circumference: 91.24"Rim Diameter
18"
Wheel sizeRecommended Rim Width
6.4" - 8.9"
Optimal rim width rangeWhere to Buy & Install 255/55R18 Tires
Looking for 255/55R18 tires? Skip hauling tires in your car—choose direct delivery to a local certified shop or doorstep delivery:
Tire Rack
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- ✓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
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Speedometer & Alternate Size Calculator
Testing an alternate size for your vehicle? Compare 255/55R18 against any proposed tire size below:
Visual Tire & Wheel Comparison
Speedometer Variance
| Indicated | Actual Speed | Diff |
|---|---|---|
| 20 mph | 20.4 mph | +0.4 mph |
| 30 mph | 30.5 mph | +0.5 mph |
| 45 mph | 45.8 mph | +0.8 mph |
| 60 mph | 61.1 mph | +1.1 mph |
| 75 mph | 76.4 mph | +1.4 mph |
| 90 mph | 91.6 mph | +1.6 mph |
Fender & Suspension Clearance
Flush fitment. Extends 17.7mm outwards. Check wheel arch clearance under full suspension compression.
Vehicles That Fit 255/55R18 (150+ Models)
Factory standard and optional vehicle fitments utilizing 255/55R18 tires: