Metric tire size
245/45R17 tire size
A 245/45R17 tire is 25.7 inches (652 mm) tall and 9.6 in wide, for a 17-inch wheel, with a 4.3 in sidewall. That is the nominal size worked out from the code. Makers publish 25.5–26 in for real 245/45R17 tires (7 makers).
Compare 245/45R17 with other sizes
Set up for: comparing 245/45R17 with a size you're considering · Different situation?
Your current size
e.g. 265/70R17, 2657017 or 33x12.50R20
Where do I find my size?
It's on the tire sidewall, e.g. P265/70R17 115T, and on the tire placard sticker on the driver's door jamb (also in the owner's manual). The placard shows the size the vehicle came with; the sidewall shows what is fitted now. If they differ, use the placard as your starting point. Digits are enough here: 2657017 or 33125020.
Size you're considering
Real 245/45R17 tires: published diameters
Figures from the makers' own data books. They differ from the 25.7 in calculated figure because each tread design and construction measures slightly differently.
| Maker (data book) | Published diameter | Revs per mile | Approved wheel width | Listings |
|---|---|---|---|---|
| BFGoodrich | 25.7 in | 810 | 7.5–9 in | 1 |
| Falken | 25.6–25.9 in | 806–813 | 7.5–9 in | 5 |
| Goodyear | 25.7 in | 814 | 7.5–9 in | 1 |
| Hankook | 25.5 in | 814–815 | 7.5–9 in | 2 |
| Nitto | 25.55–25.79 in | — | 7.5–9 in | 3 |
| Toyo | 25.7–26 in | 799–809 | 7.5–9 in | 2 |
| Uniroyal | 25.6 in | 810 | 7.5–9 in | 1 |
Equivalent sizes on other wheels
Sizes that appear in the maker data books with a diameter within 3% of 245/45R17. Same diameter is only one part of fitting a different size.
| Wheel | Real sizes within 3% (closest first) |
|---|---|
| 15-inch | 275/50R15 , 205/65R15 , 265/50R15 |
| 16-inch | 205/60R16 , 245/50R16 , 225/55R16 |
| 17-inch | 315/35R17 , 275/40R17 , 225/50R17 |
| 18-inch | 195/50R18 , 245/40R18 , 215/45R18 |
| 20-inch | 285/25R20 , 245/30R20 , 295/25R20 |
Popular comparisons with 245/45R17
FAQ
How tall is a 245/45R17 tire?
25.7 inches (652 mm) calculated from the size code. Makers publish 25.5–26 in for real tires in this size; the difference comes from tread design and construction.
How do you work out the 245/45R17 diameter?
Sidewall = 245 mm × 45% = 110.2 mm. Diameter = 17 in wheel + 2 × 110.2 mm ÷ 25.4 = 25.68 in.
Is 245/45R17 a 26-inch tire?
It is about 25.7 in tall nominally, so it is close to 26 inches. Real tires in a size vary slightly by model; check the maker's spec sheet for the exact tire.
What sizes are equivalent to 245/45R17?
Real sizes within 3% of its diameter include 205/60R16 (±0.0%), 195/50R18 (±0.0%) and 285/25R20 (−0.3%). Equal diameter alone doesn't make a size suitable: wheel width, offset, clearance and load rating all matter.
How many revolutions per mile does a 245/45R17 make?
About 785 calculated from its unloaded diameter. Makers publish 799–815 revs per mile, measured under load (a loaded tire rolls on a slightly smaller radius), which is why published figures are higher.
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