P225/40R18
Passenger / P-MetricFactory Specs, Physical Dimensions & Compatible Vehicle Applications
Factory Spec Overview
The P225/40R18 tire size features an overall diameter of 25.09 inches, a section width of 8.9 inches (225mm), and rotates 804 times per mile. It is a standard factory tire fitment on 42+ vehicle models including Kia Forte5, Kia Forte Koup.
Physical Dimensions & Specs
Overall Diameter
25.09"
637.3 mmSection Width
225 mm
8.86" wideSidewall Height
3.54"
89.9 mm (40% aspect)Revolutions / Mile
804
Circumference: 78.81"Rim Diameter
18"
Wheel sizeRecommended Rim Width
5.6" - 7.9"
Optimal rim width rangeSpeedometer & Alternate Size Calculator
Testing an alternate size for your vehicle? Compare P225/40R18 against any proposed tire size below:
Popular Comparisons:
Tire 1 (Stock / Base)225/40R18
Overall Height:25.1"
Sidewall:3.5"
Revs/Mile:804
Tire 2 (New / Compare)245/60R18
Overall Height:29.6"
Sidewall:5.8"
Revs/Mile:682
Visual Tire & Wheel Comparison
Speedometer Variance
+17.9%At 60 mph reading, actual speed is 70.7 mph
| Indicated | Actual Speed | Diff |
|---|---|---|
| 20 mph | 23.6 mph | +3.6 mph |
| 30 mph | 35.4 mph | +5.4 mph |
| 45 mph | 53.1 mph | +8.1 mph |
| 60 mph | 70.7 mph | +10.7 mph |
| 75 mph | 88.4 mph | +13.4 mph |
| 90 mph | 106.1 mph | +16.1 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:+2.24" ground clearance
Vehicles That Fit P225/40R18 (42+ Models)
Factory standard and optional vehicle fitments utilizing P225/40R18 tires: