305/65R17
Overall diameter
32.61″
828 mm
Sidewall height
7.81″
198.3 mm
Tread width
305 mm
12.0″
Circumference
102.45″
8.5 ft
Revs per mile
618
384 per km
Wheel diameter
17″
aspect ratio 65%
Cross-section
- Overall diameter
- 32.61″
- Sidewall (each side)
- 7.81″
- Wheel
- 17″
305/65R17 compared with other sizes
All 25 practical swaps involving 305/65R17 — diameter change, speedometer impact and a fit verdict for each.
305/65R17 → 265/70R17
265/70R17
Diameter +3.2% · Marginal fit — proceed with care
305/65R17 → 285/75R16
285/75R16
Diameter −0.7% · Good fit
305/65R17 → 275/65R17
275/65R17
Diameter +4.9% · Marginal fit — proceed with care
305/65R17 → 275/70R17
275/70R17
Diameter +1.4% · Good fit
305/65R17 → 285/70R17
285/70R17
Diameter −0.3% · Good fit
285/70R17 → 305/65R17
285/70R17
Diameter +0.3% · Good fit
275/70R17 → 305/65R17
275/70R17
Diameter −1.4% · Good fit
305/70R17 → 305/65R17
305/70R17
Diameter +3.7% · Marginal fit — proceed with care
265/70R17 → 305/65R17
265/70R17
Diameter −3.1% · Marginal fit — proceed with care
305/60R18 → 305/65R17
305/60R18
Diameter −0.6% · Good fit
275/65R17 → 305/65R17
275/65R17
Diameter −4.7% · Marginal fit — proceed with care
265/70R18 → 305/65R17
265/70R18
Diameter −0.0% · Good fit
285/65R18 → 305/65R17
285/65R18
Diameter −0.1% · Good fit
315/70R17 → 305/65R17
315/70R17
Diameter +5.4% · Not recommended
285/75R16 → 305/65R17
285/75R16
Diameter +0.7% · Good fit
275/65R18 → 305/65R17
275/65R18
Diameter −1.6% · Good fit
275/70R18 → 305/65R17
275/70R18
Diameter +1.7% · Good fit
265/75R16 → 305/65R17
265/75R16
Diameter −2.9% · Good fit
265/65R18 → 305/65R17
265/65R18
Diameter −3.2% · Marginal fit — proceed with care
305/65R17 → 305/70R17
305/70R17
Diameter −3.6% · Marginal fit — proceed with care
305/65R17 → 315/70R17
315/70R17
Diameter −5.1% · Not recommended
305/65R17 → 265/70R18
265/70R18
Diameter +0.0% · Good fit
305/65R17 → 285/65R18
285/65R18
Diameter +0.1% · Good fit
305/65R17 → 305/60R18
305/60R18
Diameter +0.6% · Good fit
305/65R17 → 225/45R17
225/45R17
Diameter +30.6% · Not recommended
Common questions
- What is the overall diameter of a 305/65R17 tire?
- A 305/65R17 tire is about 32.61″ (828 mm) in overall diameter, with a sidewall height of 198.3 mm and a circumference of 102.45″.
- How many revolutions per mile does a 305/65R17 tire turn?
- A 305/65R17 turns roughly 618 revolutions per mile (384 per kilometre). This is the number that determines speedometer and odometer accuracy when you change tire size.
- What do the numbers in 305/65R17 mean?
- 305 is the tread width in millimetres, 65 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 305 × 65% = 198.3 mm tall.