265/40R21
Standard MetricFactory Specs, Physical Dimensions & Compatible Vehicle Applications
Factory Spec Overview
The 265/40R21 tire size features an overall diameter of 29.35 inches, a section width of 10.4 inches (265mm), and rotates 687 times per mile. It is a standard factory tire fitment on 21+ vehicle models including BMW X3 M, BMW X4 M.
Physical Dimensions & Specs
Overall Diameter
29.35"
745.5 mmSection Width
265 mm
10.43" wideSidewall Height
4.17"
105.9 mm (40% aspect)Revolutions / Mile
687
Circumference: 92.19"Rim Diameter
21"
Wheel sizeRecommended Rim Width
6.6" - 9.3"
Optimal rim width rangeSpeedometer & Alternate Size Calculator
Testing an alternate size for your vehicle? Compare 265/40R21 against any proposed tire size below:
Popular Comparisons:
Tire 1 (Stock / Base)265/40R21
Overall Height:29.3"
Sidewall:4.2"
Revs/Mile:687
Tire 2 (New / Compare)245/60R18
Overall Height:29.6"
Sidewall:5.8"
Revs/Mile:682
Visual Tire & Wheel Comparison
Speedometer Variance
+0.8%At 60 mph reading, actual speed is 60.5 mph
| Indicated | Actual Speed | Diff |
|---|---|---|
| 20 mph | 20.2 mph | +0.2 mph |
| 30 mph | 30.2 mph | +0.2 mph |
| 45 mph | 45.4 mph | +0.4 mph |
| 60 mph | 60.5 mph | +0.5 mph |
| 75 mph | 75.6 mph | +0.6 mph |
| 90 mph | 90.7 mph | +0.7 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:+0.11" ground clearance
Vehicles That Fit 265/40R21 (21+ Models)
Factory standard and optional vehicle fitments utilizing 265/40R21 tires: