185/70R13
Overall diameter 589.2 mm
185/70R13 — 589.2 mm tall, and what it swaps with
185/70R13 is 185 mm wide with a 70% sidewall on a 13-inch wheel. That sidewall is 129.5 mm, so the tyre stands 589.2 mm tall and turns 540.2 times per kilometre.
- Section width
- 185 mm
- Aspect ratio
- 70 %
- Wheel size
- 13 in (330.2 mm)
- Sidewall height
- 129.5 mm
- Overall diameter
- 589.2 mm (23.2 in)
- Circumference
- 1851 mm
- Turns per km
- 540.2
Sizes you can swap to
Only sizes whose overall diameter stays within 3% are listed. A different diameter covers a different distance per turn, and that gap becomes speedometer error.
195/60R14589.6 mm · +0.07% you go faster205/45R16590.9 mm · +0.29% you go faster165/70R14586.6 mm · -0.44% you go slower185/55R15584.5 mm · -0.8% you go slower175/65R14583.1 mm · -1.04% you go slower195/55R15595.5 mm · +1.07% you go faster205/40R17595.8 mm · +1.12% you go faster185/65R14596.1 mm · +1.17% you go faster195/45R16581.9 mm · -1.24% you go slower175/70R14600.6 mm · +1.93% you go faster185/60R14577.6 mm · -1.97% you go slower195/50R16601.4 mm · +2.07% you go faster
Same profile, different width
Other sizes for this wheel
How the code reads
The 205 is millimetres, the 55 is a percentage of that width, and only the 16 is inches. The R stands for radial construction.
How to read this
- The first three digits are the width in mm, the middle two are the aspect ratio in percent, the last two the wheel in inches.
- Sidewall height = width × aspect ÷ 100. For 205/55 that is 112.75 mm.
- Overall diameter = wheel diameter + twice the sidewall. A 16-inch wheel is 406.4 mm.
- Once the diameter shifts by more than 3%, the speedometer and odometer drift by the same amount.
Frequently asked questions
Q. What is the overall diameter of 185/70R13?
589.2 mm — the 330.2 mm wheel plus the 129.5 mm sidewall at top and bottom.
Q. How many turns per kilometre does 185/70R13 make?
Its circumference is 1851 mm, so 540.2 turns.
Q. What can I swap it for?
12 sizes stay within 3% of its diameter — the closest is 195/60R14 at 589.6 mm.
Q. Why is the sidewall 129.5 mm?
Because it is 70% of the 185 mm width. The aspect ratio is a proportion of the width, not a length.