What is the overall diameter of a 225/45R17 tire?

A 225/45R17 tire is about 24.97″ (634 mm) in overall diameter, with a sidewall height of 101.3 mm and a circumference of 78.45″.

How many revolutions per mile does a 225/45R17 tire turn?

A 225/45R17 turns roughly 808 revolutions per mile (502 per kilometre). This is the number that determines speedometer and odometer accuracy when you change tire size.

What do the numbers in 225/45R17 mean?

225 is the tread width in millimetres, 45 is the aspect ratio — the sidewall height as a percentage of the tread width — and 17 is the wheel diameter in inches. So the sidewall is 225 × 45% = 101.3 mm tall.

225/45R17

Most common 17″ size

Common fitments: Golf GTI, Civic, 3 Series, WRX

Overall diameter

24.97″

634 mm

Sidewall height

3.99″

101.3 mm

Tread width

225 mm

8.9″

Circumference

78.45″

6.5 ft

Revs per mile

808

502 per km

Wheel diameter

17″

aspect ratio 45%

Compare 225/45R17 in the tool Compare with a custom size

Cross-section

Overall diameter: 24.97″
Sidewall (each side): 3.99″
Wheel: 17″

225/45R17 compared with other sizes

All 57 practical swaps involving 225/45R17 — diameter change, speedometer impact and a fit verdict for each.

225/45R17 → 185/60R15

185/60R15

Diameter +5.2% · Not recommended

225/45R17 → 185/65R15

185/65R15

Diameter +2.1% · Good fit

225/45R17 → 195/60R15

195/60R15

Diameter +3.1% · Marginal fit — proceed with care

225/45R17 → 195/65R15

195/65R15

Diameter −0.0% · Good fit

225/45R17 → 205/65R15

205/65R15

Diameter −2.0% · Good fit

225/45R17 → 185/55R16

185/55R16

Diameter +4.0% · Marginal fit — proceed with care

225/45R17 → 195/50R16

195/50R16

Diameter +5.5% · Not recommended

225/45R17 → 195/55R16

195/55R16

Diameter +2.2% · Good fit

225/45R17 → 205/55R16

205/55R16

Diameter +0.4% · Good fit

225/45R17 → 205/50R17

205/50R17

Diameter −0.4% · Good fit

225/45R17 → 215/45R17

215/45R17

Diameter +1.4% · Good fit

225/45R17 → 215/50R17

215/50R17

Diameter −1.9% · Good fit

225/45R17 → 215/55R17

215/55R17

Diameter −5.1% · Not recommended

205/50R17 → 225/45R17

205/50R17

Diameter +0.4% · Good fit

215/45R17 → 225/45R17

215/45R17

Diameter −1.4% · Good fit

235/45R17 → 225/45R17

235/45R17

Diameter +1.4% · Good fit

215/50R17 → 225/45R17

215/50R17

Diameter +2.0% · Good fit

225/50R17 → 225/45R17

225/50R17

Diameter +3.5% · Marginal fit — proceed with care

245/45R17 → 225/45R17

245/45R17

Diameter +2.8% · Good fit

225/40R18 → 225/45R17

225/40R18

Diameter +0.5% · Good fit

195/65R15 → 225/45R17

195/65R15

Diameter +0.0% · Good fit

215/55R17 → 225/45R17

215/55R17

Diameter +5.4% · Not recommended

205/55R16 → 225/45R17

205/55R16

Diameter −0.4% · Good fit

215/55R16 → 225/45R17

215/55R16

Diameter +1.4% · Good fit

235/40R18 → 225/45R17

235/40R18

Diameter +1.7% · Good fit

185/65R15 → 225/45R17

185/65R15

Diameter −2.0% · Good fit

205/65R15 → 225/45R17

205/65R15

Diameter +2.1% · Good fit

225/45R17 → 225/50R17

225/50R17

Diameter −3.4% · Marginal fit — proceed with care

225/45R17 → 235/45R17

235/45R17

Diameter −1.4% · Good fit

225/45R17 → 245/45R17

245/45R17

Diameter −2.8% · Good fit

225/45R17 → 225/40R18

225/40R18

Diameter −0.5% · Good fit

225/45R17 → 235/40R18

235/40R18

Diameter −1.7% · Good fit

225/55R17 → 225/45R17

225/55R17

Diameter +7.1% · Not recommended

235/55R17 → 225/45R17

235/55R17

Diameter +8.8% · Not recommended

265/70R17 → 225/45R17

265/70R17

Diameter +26.6% · Not recommended

215/60R17 → 225/45R17

215/60R17

Diameter +8.7% · Not recommended

215/65R17 → 225/45R17

215/65R17

Diameter +12.1% · Not recommended

225/60R17 → 225/45R17

225/60R17

Diameter +10.6% · Not recommended

225/65R17 → 225/45R17

225/65R17

Diameter +14.2% · Not recommended

235/60R17 → 225/45R17

235/60R17

Diameter +12.5% · Not recommended

235/65R17 → 225/45R17

235/65R17

Diameter +16.2% · Not recommended

235/80R17 → 225/45R17

235/80R17

Diameter +27.4% · Not recommended

245/65R17 → 225/45R17

245/65R17

Diameter +18.3% · Not recommended

245/70R17 → 225/45R17

245/70R17

Diameter +22.2% · Not recommended

245/75R17 → 225/45R17

245/75R17

Diameter +26.0% · Not recommended

255/65R17 → 225/45R17

255/65R17

Diameter +20.3% · Not recommended

255/70R17 → 225/45R17

255/70R17

Diameter +24.4% · Not recommended

255/75R17 → 225/45R17

255/75R17

Diameter +28.4% · Not recommended

265/65R17 → 225/45R17

265/65R17

Diameter +22.4% · Not recommended

275/65R17 → 225/45R17

275/65R17

Diameter +24.4% · Not recommended

275/70R17 → 225/45R17

275/70R17

Diameter +28.8% · Not recommended

285/70R17 → 225/45R17

285/70R17

Diameter +31.0% · Not recommended

305/65R17 → 225/45R17

305/65R17

Diameter +30.6% · Not recommended

305/70R17 → 225/45R17

305/70R17

Diameter +35.4% · Not recommended

315/70R17 → 225/45R17

315/70R17

Diameter +37.6% · Not recommended

245/40R18 → 225/45R17

245/40R18

Diameter +3.0% · Good fit

235/45R18 → 225/45R17

235/45R18

Diameter +5.4% · Not recommended

Common questions

What is the overall diameter of a 225/45R17 tire?: A 225/45R17 tire is about 24.97″ (634 mm) in overall diameter, with a sidewall height of 101.3 mm and a circumference of 78.45″.
How many revolutions per mile does a 225/45R17 tire turn?: A 225/45R17 turns roughly 808 revolutions per mile (502 per kilometre). This is the number that determines speedometer and odometer accuracy when you change tire size.
What do the numbers in 225/45R17 mean?: 225 is the tread width in millimetres, 45 is the aspect ratio — the sidewall height as a percentage of the tread width — and 17 is the wheel diameter in inches. So the sidewall is 225 × 45% = 101.3 mm tall.