245/45R17
Overall diameter 652.3 mm
245/45R17 — 652.3 mm tall, and what it swaps with
245/45R17 is 245 mm wide with a 45% sidewall on a 17-inch wheel. That sidewall is 110.25 mm, so the tyre stands 652.3 mm tall and turns 488 times per kilometre.
- Section width
- 245 mm
- Aspect ratio
- 45 %
- Wheel size
- 17 in (431.8 mm)
- Sidewall height
- 110.25 mm
- Overall diameter
- 652.3 mm (25.68 in)
- Circumference
- 2049.3 mm
- Turns per km
- 488
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.
205/60R16652.4 mm · +0.02% you go faster245/40R18653.2 mm · +0.14% you go faster285/30R19653.6 mm · +0.2% you go faster225/55R16653.9 mm · +0.25% you go faster215/45R18650.7 mm · -0.25% you go slower245/35R19654.1 mm · +0.28% you go faster275/35R18649.7 mm · -0.4% you go slower245/30R20655 mm · +0.41% you go faster225/50R17656.8 mm · +0.69% you go faster275/30R19647.6 mm · -0.72% you go slower205/65R15647.5 mm · -0.74% you go slower205/55R17657.3 mm · +0.77% you go faster
Same profile, different width
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 245/45R17?
652.3 mm — the 431.8 mm wheel plus the 110.25 mm sidewall at top and bottom.
Q. How many turns per kilometre does 245/45R17 make?
Its circumference is 2049.3 mm, so 488 turns.
Q. What can I swap it for?
12 sizes stay within 3% of its diameter — the closest is 205/60R16 at 652.4 mm.
Q. Why is the sidewall 110.25 mm?
Because it is 45% of the 245 mm width. The aspect ratio is a proportion of the width, not a length.