285/50R20
Overall diameter
31.22″
793 mm
Sidewall height
5.61″
142.5 mm
Tread width
285 mm
11.2″
Circumference
98.08″
8.2 ft
Revs per mile
646
401 per km
Wheel diameter
20″
aspect ratio 50%
Cross-section
- Overall diameter
- 31.22″
- Sidewall (each side)
- 5.61″
- Wheel
- 20″
285/50R20 compared with other sizes
All 34 practical swaps involving 285/50R20 — diameter change, speedometer impact and a fit verdict for each.
285/50R20 → 275/45R20
275/45R20
Diameter +5.0% · Marginal fit — proceed with care
285/50R20 → 275/55R20
275/55R20
Diameter −2.2% · Good fit
285/50R20 → 285/60R18
285/60R18
Diameter −0.8% · Good fit
285/50R20 → 255/60R19
255/60R19
Diameter +0.6% · Good fit
285/50R20 → 275/55R19
275/55R19
Diameter +1.0% · Good fit
285/50R20 → 245/50R20
245/50R20
Diameter +5.3% · Not recommended
285/50R20 → 255/50R20
255/50R20
Diameter +3.9% · Marginal fit — proceed with care
285/50R20 → 255/55R20
255/55R20
Diameter +0.6% · Good fit
285/50R20 → 265/50R20
265/50R20
Diameter +2.6% · Good fit
285/50R20 → 265/55R20
265/55R20
Diameter −0.8% · Good fit
285/50R20 → 265/60R20
265/60R20
Diameter −4.0% · Marginal fit — proceed with care
285/50R20 → 275/60R20
275/60R20
Diameter −5.4% · Not recommended
255/55R20 → 285/50R20
255/55R20
Diameter −0.6% · Good fit
265/55R20 → 285/50R20
265/55R20
Diameter +0.8% · Good fit
275/55R20 → 285/50R20
275/55R20
Diameter +2.2% · Good fit
285/55R20 → 285/50R20
285/55R20
Diameter +3.6% · Marginal fit — proceed with care
265/50R20 → 285/50R20
265/50R20
Diameter −2.5% · Good fit
305/50R20 → 285/50R20
305/50R20
Diameter +2.5% · Good fit
255/50R20 → 285/50R20
255/50R20
Diameter −3.8% · Marginal fit — proceed with care
285/45R21 → 285/50R20
285/45R21
Diameter −0.4% · Good fit
265/60R20 → 285/50R20
265/60R20
Diameter +4.2% · Marginal fit — proceed with care
285/60R18 → 285/50R20
285/60R18
Diameter +0.8% · Good fit
285/40R22 → 285/50R20
285/40R22
Diameter −0.8% · Good fit
275/45R20 → 285/50R20
275/45R20
Diameter −4.7% · Marginal fit — proceed with care
245/50R20 → 285/50R20
245/50R20
Diameter −5.0% · Not recommended
255/65R18 → 285/50R20
255/65R18
Diameter −0.5% · Good fit
285/50R20 → 285/55R20
285/55R20
Diameter −3.5% · Marginal fit — proceed with care
285/50R20 → 305/50R20
305/50R20
Diameter −2.5% · Good fit
285/50R20 → 275/45R21
275/45R21
Diameter +1.5% · Good fit
285/50R20 → 275/50R21
275/50R21
Diameter −1.9% · Good fit
285/50R20 → 285/45R21
285/45R21
Diameter +0.4% · Good fit
285/50R20 → 275/40R22
275/40R22
Diameter +1.8% · Good fit
285/50R20 → 285/40R22
285/40R22
Diameter +0.8% · Good fit
285/50R20 → 285/45R22
285/45R22
Diameter −2.7% · Good fit
Common questions
- What is the overall diameter of a 285/50R20 tire?
- A 285/50R20 tire is about 31.22″ (793 mm) in overall diameter, with a sidewall height of 142.5 mm and a circumference of 98.08″.
- How many revolutions per mile does a 285/50R20 tire turn?
- A 285/50R20 turns roughly 646 revolutions per mile (401 per kilometre). This is the number that determines speedometer and odometer accuracy when you change tire size.
- What do the numbers in 285/50R20 mean?
- 285 is the tread width in millimetres, 50 is the aspect ratio — the sidewall height as a percentage of the tread width — and 20 is the wheel diameter in inches. So the sidewall is 285 × 50% = 142.5 mm tall.