235/55R18
Standard MetricFactory Specs, Physical Dimensions & Compatible Vehicle Applications
Factory Spec Overview
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 rangeSpeedometer & Alternate Size Calculator
Testing an alternate size for your vehicle? Compare 235/55R18 against any proposed tire size below:
Popular Comparisons:
Tire 1 (Stock / Base)235/55R18
Overall Height:28.2"
Sidewall:5.1"
Revs/Mile:716
Tire 2 (New / Compare)245/60R18
Overall Height:29.6"
Sidewall:5.8"
Revs/Mile:682
Visual Tire & Wheel Comparison
Speedometer Variance
+5.0%At 60 mph reading, actual speed is 63.0 mph
| 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
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:+0.70" ground clearance
Vehicles That Fit 235/55R18 (150+ Models)
Factory standard and optional vehicle fitments utilizing 235/55R18 tires: