P275/40R18
Passenger / P-MetricFactory Specs, Physical Dimensions & Compatible Vehicle Applications
Factory Spec Overview
The P275/40R18 tire size features an overall diameter of 26.66 inches, a section width of 10.8 inches (275mm), and rotates 756 times per mile. It is a standard factory tire fitment on 36+ vehicle models including Chevrolet Corvette.
Physical Dimensions & Specs
Overall Diameter
26.66"
677.2 mmSection Width
275 mm
10.83" wideSidewall Height
4.33"
110.0 mm (40% aspect)Revolutions / Mile
756
Circumference: 83.76"Rim Diameter
18"
Wheel sizeRecommended Rim Width
6.9" - 9.6"
Optimal rim width rangeSpeedometer & Alternate Size Calculator
Testing an alternate size for your vehicle? Compare P275/40R18 against any proposed tire size below:
Popular Comparisons:
Tire 1 (Stock / Base)275/40R18
Overall Height:26.7"
Sidewall:4.3"
Revs/Mile:756
Tire 2 (New / Compare)245/60R18
Overall Height:29.6"
Sidewall:5.8"
Revs/Mile:682
Visual Tire & Wheel Comparison
Speedometer Variance
+10.9%At 60 mph reading, actual speed is 66.6 mph
| Indicated | Actual Speed | Diff |
|---|---|---|
| 20 mph | 22.2 mph | +2.2 mph |
| 30 mph | 33.3 mph | +3.3 mph |
| 45 mph | 49.9 mph | +4.9 mph |
| 60 mph | 66.6 mph | +6.6 mph |
| 75 mph | 83.2 mph | +8.2 mph |
| 90 mph | 99.8 mph | +9.8 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:+1.46" ground clearance
Vehicles That Fit P275/40R18 (36+ Models)
Factory standard and optional vehicle fitments utilizing P275/40R18 tires: