225/70R15
Overall diameter 696 mm
225/70R15 — 696 mm tall, and what it swaps with
225/70R15 is 225 mm wide with a 70% sidewall on a 15-inch wheel. That sidewall is 157.5 mm, so the tyre stands 696 mm tall and turns 457.4 times per kilometre.
- Section width
- 225 mm
- Aspect ratio
- 70 %
- Wheel size
- 15 in (381 mm)
- Sidewall height
- 157.5 mm
- Overall diameter
- 696 mm (27.4 in)
- Circumference
- 2186.5 mm
- Turns per km
- 457.4
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.
235/45R19694.1 mm · -0.27% you go slower275/30R21698.4 mm · +0.34% you go faster265/35R20693.5 mm · -0.36% you go slower225/65R16698.9 mm · +0.42% you go faster235/50R18692.2 mm · -0.55% you go slower275/35R20700.5 mm · +0.65% you go faster305/30R20691 mm · -0.72% you go slower285/25R22701.3 mm · +0.76% you go faster235/55R17690.3 mm · -0.82% you go slower225/60R17701.8 mm · +0.83% you go faster245/50R18702.2 mm · +0.89% you go faster215/60R17689.8 mm · -0.89% you go slower
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 225/70R15?
696 mm — the 381 mm wheel plus the 157.5 mm sidewall at top and bottom.
Q. How many turns per kilometre does 225/70R15 make?
Its circumference is 2186.5 mm, so 457.4 turns.
Q. What can I swap it for?
12 sizes stay within 3% of its diameter — the closest is 235/45R19 at 694.1 mm.
Q. Why is the sidewall 157.5 mm?
Because it is 70% of the 225 mm width. The aspect ratio is a proportion of the width, not a length.