325/30R23
Overall diameter 779.2 mm
325/30R23 — 779.2 mm tall, and what it swaps with
325/30R23 is 325 mm wide with a 30% sidewall on a 23-inch wheel. That sidewall is 97.5 mm, so the tyre stands 779.2 mm tall and turns 408.5 times per kilometre.
- Section width
- 325 mm
- Aspect ratio
- 30 %
- Wheel size
- 23 in (584.2 mm)
- Sidewall height
- 97.5 mm
- Overall diameter
- 779.2 mm (30.68 in)
- Circumference
- 2447.9 mm
- Turns per km
- 408.5
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.
275/40R22778.8 mm · -0.05% you go slower275/45R21780.9 mm · +0.22% you go faster265/70R16777.4 mm · -0.23% you go slower275/35R23776.7 mm · -0.32% you go slower265/65R17776.3 mm · -0.37% you go slower265/60R18775.2 mm · -0.51% you go slower245/70R17774.8 mm · -0.56% you go slower285/35R23783.7 mm · +0.58% you go faster265/50R20773 mm · -0.8% you go slower325/35R22786.3 mm · +0.91% you go faster265/45R21771.9 mm · -0.94% you go slower285/40R22786.8 mm · +0.98% 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 325/30R23?
779.2 mm — the 584.2 mm wheel plus the 97.5 mm sidewall at top and bottom.
Q. How many turns per kilometre does 325/30R23 make?
Its circumference is 2447.9 mm, so 408.5 turns.
Q. What can I swap it for?
12 sizes stay within 3% of its diameter — the closest is 275/40R22 at 778.8 mm.
Q. Why is the sidewall 97.5 mm?
Because it is 30% of the 325 mm width. The aspect ratio is a proportion of the width, not a length.