235/55R18
Standard MetricFactory Specs, Physical Dimensions & Compatible Vehicle Applications
The 235/55R18 tire size features an overall diameter of 28.18 inches, a section width of 9.3 inches (235mm), and rotates 716 times per mile. It is a standard factory tire fitment on 150+ vehicle models including Audi Q3.
Physical Dimensions & Specs
Overall Diameter
28.18"
715.8 mmSection Width
235 mm
9.25" wideSidewall Height
5.09"
129.3 mm (55% aspect)Revolutions / Mile
716
Circumference: 88.52"Rim Diameter
18"
Wheel sizeRecommended Rim Width
5.9" - 8.2"
Optimal rim width rangeWhere to Buy & Install 235/55R18 Tires
Looking for 235/55R18 tires? Skip hauling tires in your car—choose direct delivery to a local certified shop or doorstep delivery:
Tire Rack
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Amazon Automotive
Fast doorstep shipping for DIYers or bringing to your own shop.
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Speedometer & Alternate Size Calculator
Testing an alternate size for your vehicle? Compare 235/55R18 against any proposed tire size below:
Visual Tire & Wheel Comparison
Speedometer Variance
| Indicated | Actual Speed | Diff |
|---|---|---|
| 20 mph | 21.0 mph | +1.0 mph |
| 30 mph | 31.5 mph | +1.5 mph |
| 45 mph | 47.2 mph | +2.2 mph |
| 60 mph | 63.0 mph | +3.0 mph |
| 75 mph | 78.7 mph | +3.7 mph |
| 90 mph | 94.5 mph | +4.5 mph |
Fender & Suspension Clearance
Flush fitment. Extends 17.7mm outwards. Check wheel arch clearance under full suspension compression.
Vehicles That Fit 235/55R18 (150+ Models)
Factory standard and optional vehicle fitments utilizing 235/55R18 tires: