205/40R17
Overall diameter 595.8 mm
205/40R17 — 595.8 mm tall, and what it swaps with
205/40R17 is 205 mm wide with a 40% sidewall on a 17-inch wheel. That sidewall is 82 mm, so the tyre stands 595.8 mm tall and turns 534.2 times per kilometre.
- Section width
- 205 mm
- Aspect ratio
- 40 %
- Wheel size
- 17 in (431.8 mm)
- Sidewall height
- 82 mm
- Overall diameter
- 595.8 mm (23.46 in)
- Circumference
- 1871.8 mm
- Turns per km
- 534.2
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.
185/65R14596.1 mm · +0.05% you go faster195/55R15595.5 mm · -0.05% you go slower175/70R14600.6 mm · +0.81% you go faster205/45R16590.9 mm · -0.82% you go slower195/50R16601.4 mm · +0.94% you go faster205/60R14601.6 mm · +0.97% you go faster195/60R14589.6 mm · -1.04% you go slower185/70R13589.2 mm · -1.11% you go slower185/60R15603 mm · +1.21% you go faster195/70R13603.2 mm · +1.24% you go faster165/70R14586.6 mm · -1.54% you go slower185/55R15584.5 mm · -1.9% you go slower
Other sizes for this wheel
17-inch wheels
205/40R17 595.8mm205/45R17 616.3mm205/50R17 636.8mm205/55R17 657.3mm215/45R17 625.3mm215/50R17 646.8mm215/55R17 668.3mm215/60R17 689.8mm215/65R17 711.3mm225/45R17 634.3mm225/50R17 656.8mm225/55R17 679.3mm225/60R17 701.8mm225/65R17 724.3mm235/45R17 643.3mm235/55R17 690.3mm235/60R17 713.8mm235/65R17 737.3mm245/45R17 652.3mm245/65R17 750.3mm245/70R17 774.8mm255/65R17 763.3mm265/65R17 776.3mm265/70R17 802.8mm
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 205/40R17?
595.8 mm — the 431.8 mm wheel plus the 82 mm sidewall at top and bottom.
Q. How many turns per kilometre does 205/40R17 make?
Its circumference is 1871.8 mm, so 534.2 turns.
Q. What can I swap it for?
12 sizes stay within 3% of its diameter — the closest is 185/65R14 at 596.1 mm.
Q. Why is the sidewall 82 mm?
Because it is 40% of the 205 mm width. The aspect ratio is a proportion of the width, not a length.