245/40R21
Standard MetricFactory Specs, Physical Dimensions & Compatible Vehicle Applications
Factory Spec Overview
The 245/40R21 tire size features an overall diameter of 28.72 inches, a section width of 9.6 inches (245mm), and rotates 702 times per mile. It is a standard factory tire fitment on 20+ vehicle models including Genesis G90.
Physical Dimensions & Specs
Overall Diameter
28.72"
729.5 mmSection Width
245 mm
9.65" wideSidewall Height
3.86"
98.0 mm (40% aspect)Revolutions / Mile
702
Circumference: 90.22"Rim Diameter
21"
Wheel sizeRecommended Rim Width
6.1" - 8.6"
Optimal rim width rangeSpeedometer & Alternate Size Calculator
Testing an alternate size for your vehicle? Compare 245/40R21 against any proposed tire size below:
Popular Comparisons:
Tire 1 (Stock / Base)245/40R21
Overall Height:28.7"
Sidewall:3.9"
Revs/Mile:702
Tire 2 (New / Compare)245/60R18
Overall Height:29.6"
Sidewall:5.8"
Revs/Mile:682
Visual Tire & Wheel Comparison
Speedometer Variance
+3.0%At 60 mph reading, actual speed is 61.8 mph
| Indicated | Actual Speed | Diff |
|---|---|---|
| 20 mph | 20.6 mph | +0.6 mph |
| 30 mph | 30.9 mph | +0.9 mph |
| 45 mph | 46.3 mph | +1.3 mph |
| 60 mph | 61.8 mph | +1.8 mph |
| 75 mph | 77.2 mph | +2.2 mph |
| 90 mph | 92.7 mph | +2.7 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:+0.43" ground clearance
Vehicles That Fit 245/40R21 (20+ Models)
Factory standard and optional vehicle fitments utilizing 245/40R21 tires: