245/50R18
Standard MetricFactory Specs, Physical Dimensions & Compatible Vehicle Applications
Factory Spec Overview
The 245/50R18 tire size features an overall diameter of 27.65 inches, a section width of 9.6 inches (245mm), and rotates 730 times per mile. It is a standard factory tire fitment on 150+ vehicle models including BMW 745i, BMW 745Li.
Physical Dimensions & Specs
Overall Diameter
27.65"
702.3 mmSection Width
245 mm
9.65" wideSidewall Height
4.82"
122.4 mm (50% aspect)Revolutions / Mile
730
Circumference: 86.85"Rim Diameter
18"
Wheel sizeRecommended Rim Width
6.1" - 8.6"
Optimal rim width rangeSpeedometer & Alternate Size Calculator
Testing an alternate size for your vehicle? Compare 245/50R18 against any proposed tire size below:
Popular Comparisons:
Tire 1 (Stock / Base)245/50R18
Overall Height:27.6"
Sidewall:4.8"
Revs/Mile:730
Tire 2 (New / Compare)245/60R18
Overall Height:29.6"
Sidewall:5.8"
Revs/Mile:682
Visual Tire & Wheel Comparison
Speedometer Variance
+7.0%At 60 mph reading, actual speed is 64.2 mph
| Indicated | Actual Speed | Diff |
|---|---|---|
| 20 mph | 21.4 mph | +1.4 mph |
| 30 mph | 32.1 mph | +2.1 mph |
| 45 mph | 48.1 mph | +3.1 mph |
| 60 mph | 64.2 mph | +4.2 mph |
| 75 mph | 80.2 mph | +5.2 mph |
| 90 mph | 96.3 mph | +6.3 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:+0.96" ground clearance
Vehicles That Fit 245/50R18 (150+ Models)
Factory standard and optional vehicle fitments utilizing 245/50R18 tires: