235/75R15
Overall diameter 733.5 mm
235/75R15 — 733.5 mm tall, and what it swaps with
235/75R15 is 235 mm wide with a 75% sidewall on a 15-inch wheel. That sidewall is 176.25 mm, so the tyre stands 733.5 mm tall and turns 434 times per kilometre.
- Section width
- 235 mm
- Aspect ratio
- 75 %
- Wheel size
- 15 in (381 mm)
- Sidewall height
- 176.25 mm
- Overall diameter
- 733.5 mm (28.88 in)
- Circumference
- 2304.4 mm
- Turns per km
- 434
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.
285/35R21732.9 mm · -0.08% you go slower235/70R16735.4 mm · +0.26% you go faster295/30R22735.8 mm · +0.31% you go faster285/40R20736 mm · +0.34% you go faster225/55R19730.1 mm · -0.46% you go slower275/45R19730.1 mm · -0.46% you go slower235/65R17737.3 mm · +0.52% you go faster255/35R22737.3 mm · +0.52% you go faster255/40R21737.4 mm · +0.53% you go faster255/45R20737.5 mm · +0.55% you go faster255/50R19737.6 mm · +0.56% you go faster245/40R21729.4 mm · -0.56% you go slower
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 235/75R15?
733.5 mm — the 381 mm wheel plus the 176.25 mm sidewall at top and bottom.
Q. How many turns per kilometre does 235/75R15 make?
Its circumference is 2304.4 mm, so 434 turns.
Q. What can I swap it for?
12 sizes stay within 3% of its diameter — the closest is 285/35R21 at 732.9 mm.
Q. Why is the sidewall 176.25 mm?
Because it is 75% of the 235 mm width. The aspect ratio is a proportion of the width, not a length.