215/40R18
Standard MetricFactory Specs, Physical Dimensions & Compatible Vehicle Applications
The 215/40R18 tire size features an overall diameter of 24.77 inches, a section width of 8.5 inches (215mm), and rotates 814 times per mile. It is a standard factory tire fitment on 72+ vehicle models including BMW 135i.
Physical Dimensions & Specs
Overall Diameter
24.77"
629.2 mmSection Width
215 mm
8.46" wideSidewall Height
3.39"
86.1 mm (40% aspect)Revolutions / Mile
814
Circumference: 77.82"Rim Diameter
18"
Wheel sizeRecommended Rim Width
5.4" - 7.5"
Optimal rim width rangeWhere to Buy & Install 215/40R18 Tires
Looking for 215/40R18 tires? Skip hauling tires in your car—choose direct delivery to a local certified shop or doorstep delivery:
Tire Rack
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Amazon Automotive
Fast doorstep shipping for DIYers or bringing to your own shop.
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Speedometer & Alternate Size Calculator
Testing an alternate size for your vehicle? Compare 215/40R18 against any proposed tire size below:
Visual Tire & Wheel Comparison
Speedometer Variance
| Indicated | Actual Speed | Diff |
|---|---|---|
| 20 mph | 23.9 mph | +3.9 mph |
| 30 mph | 35.8 mph | +5.8 mph |
| 45 mph | 53.7 mph | +8.7 mph |
| 60 mph | 71.6 mph | +11.6 mph |
| 75 mph | 89.5 mph | +14.5 mph |
| 90 mph | 107.5 mph | +17.5 mph |
Fender & Suspension Clearance
Flush fitment. Extends 17.7mm outwards. Check wheel arch clearance under full suspension compression.
Vehicles That Fit 215/40R18 (72+ Models)
Factory standard and optional vehicle fitments utilizing 215/40R18 tires: