185/70R15
Standard MetricFactory Specs, Physical Dimensions & Compatible Vehicle Applications
Factory Spec Overview
The 185/70R15 tire size features an overall diameter of 25.2 inches, a section width of 7.3 inches (185mm), and rotates 800 times per mile. It is a standard factory tire fitment on 15+ vehicle models including Porsche 911, Porsche 924.
Physical Dimensions & Specs
Overall Diameter
25.2"
640.1 mmSection Width
185 mm
7.28" wideSidewall Height
5.1"
129.5 mm (70% aspect)Revolutions / Mile
800
Circumference: 79.16"Rim Diameter
15"
Wheel sizeRecommended Rim Width
4.6" - 6.5"
Optimal rim width rangeSpeedometer & Alternate Size Calculator
Testing an alternate size for your vehicle? Compare 185/70R15 against any proposed tire size below:
Popular Comparisons:
Tire 1 (Stock / Base)185/70R15
Overall Height:25.2"
Sidewall:5.1"
Revs/Mile:800
Tire 2 (New / Compare)245/60R18
Overall Height:29.6"
Sidewall:5.8"
Revs/Mile:682
Visual Tire & Wheel Comparison
Speedometer Variance
+17.4%At 60 mph reading, actual speed is 70.4 mph
| Indicated | Actual Speed | Diff |
|---|---|---|
| 20 mph | 23.5 mph | +3.5 mph |
| 30 mph | 35.2 mph | +5.2 mph |
| 45 mph | 52.8 mph | +7.8 mph |
| 60 mph | 70.4 mph | +10.4 mph |
| 75 mph | 88.0 mph | +13.0 mph |
| 90 mph | 105.6 mph | +15.6 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:+2.19" ground clearance
Vehicles That Fit 185/70R15 (15+ Models)
Factory standard and optional vehicle fitments utilizing 185/70R15 tires: