185/70R15 Tire Size Specifications & Compatible Vehicles
Overall Diameter
640.0 mm
Section Width
185 mm
Sidewall Height
129.5 mm
Circumference
2010.6 mm
Revs/Mile
800
Rim Diameter
15"
Inch Equivalent
25.2x7.3R15
Rim Width (ETRTO)
5.0" – 7.0"
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 185/70R15 and may be used as replacements:
Understanding 185/70R15
The tire size 185/70R15 means the tire has a section width of 185mm, an aspect ratio of 70% (the sidewall height is 70% of the width), and fits a 15-inch rim.
Sidewall Height = 185 x 0.7 = 129.5 mm
Overall Diameter = (129.5 x 2) + (15 x 25.4) = 640.0 mm
Circumference = 640.0 x π = 2010.6 mm
Overall Diameter = (129.5 x 2) + (15 x 25.4) = 640.0 mm
Circumference = 640.0 x π = 2010.6 mm
Frequently Asked Questions
The 185/70R15 is a standard tire size. Check your vehicle door jamb sticker or owner manual to confirm compatibility.
A 185/70R15 tire has an overall diameter of 640.0mm (25.2 inches). The sidewall height is 129.5mm, and the total circumference is 2011mm.
For 185/70R15 tires, the ETRTO recommended rim width is 6.0". The acceptable range is 5.0" minimum to 7.0" maximum. Using a rim outside this range can cause improper bead seating and unsafe handling.
Yes, as long as the replacement tire overall diameter is within 3% of the 185/70R15 640.0mm diameter. Compatible alternatives include 195/60R16, 235/55R15, 285/50R14. Use our Tire Size Calculator to compare any two sizes.