305/35R23
Overall diameter 797.7 mm
305/35R23 — 797.7 mm tall, and what it swaps with
305/35R23 is 305 mm wide with a 35% sidewall on a 23-inch wheel. That sidewall is 106.75 mm, so the tyre stands 797.7 mm tall and turns 399 times per kilometre.
- Section width
- 305 mm
- Aspect ratio
- 35 %
- Wheel size
- 23 in (584.2 mm)
- Sidewall height
- 106.75 mm
- Overall diameter
- 797.7 mm (31.41 in)
- Circumference
- 2506 mm
- Turns per km
- 399
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.
285/50R20793 mm · -0.59% you go slower265/70R17802.8 mm · +0.64% you go faster305/40R22802.8 mm · +0.64% you go faster265/75R16803.9 mm · +0.78% you go faster295/35R23790.7 mm · -0.88% you go slower275/45R22806.3 mm · +1.08% you go faster285/40R22786.8 mm · -1.37% you go slower325/35R22786.3 mm · -1.43% you go slower275/55R20810.5 mm · +1.6% you go faster285/35R23783.7 mm · -1.76% you go slower275/65R18814.7 mm · +2.13% you go faster275/45R21780.9 mm · -2.11% 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 305/35R23?
797.7 mm — the 584.2 mm wheel plus the 106.75 mm sidewall at top and bottom.
Q. How many turns per kilometre does 305/35R23 make?
Its circumference is 2506 mm, so 399 turns.
Q. What can I swap it for?
12 sizes stay within 3% of its diameter — the closest is 285/50R20 at 793 mm.
Q. Why is the sidewall 106.75 mm?
Because it is 35% of the 305 mm width. The aspect ratio is a proportion of the width, not a length.