275/45R20
Common fitments: Tahoe, Expedition, Grand Cherokee
Overall diameter
29.74″
756 mm
Sidewall height
4.87″
123.8 mm
Tread width
275 mm
10.8″
Circumference
93.44″
7.8 ft
Revs per mile
678
421 per km
Wheel diameter
20″
aspect ratio 45%
Cross-section
- Overall diameter
- 29.74″
- Sidewall (each side)
- 4.87″
- Wheel
- 20″
275/45R20 compared with other sizes
All 32 practical swaps involving 275/45R20 — diameter change, speedometer impact and a fit verdict for each.
275/45R20 → 265/50R19
265/50R19
Diameter +1.1% · Good fit
275/45R20 → 255/45R20
255/45R20
Diameter +2.4% · Good fit
245/50R20 → 275/45R20
245/50R20
Diameter −0.3% · Good fit
255/50R20 → 275/45R20
255/50R20
Diameter +1.0% · Good fit
265/45R20 → 275/45R20
265/45R20
Diameter −1.2% · Good fit
265/50R20 → 275/45R20
265/50R20
Diameter +2.3% · Good fit
255/45R20 → 275/45R20
255/45R20
Diameter −2.4% · Good fit
275/40R20 → 275/45R20
275/40R20
Diameter −3.6% · Marginal fit — proceed with care
245/45R20 → 275/45R20
245/45R20
Diameter −3.6% · Marginal fit — proceed with care
255/55R20 → 275/45R20
255/55R20
Diameter +4.4% · Marginal fit — proceed with care
285/50R20 → 275/45R20
285/50R20
Diameter +5.0% · Marginal fit — proceed with care
295/35R20 → 275/45R20
295/35R20
Diameter −5.4% · Not recommended
245/55R19 → 275/45R20
245/55R19
Diameter −0.5% · Good fit
245/60R18 → 275/45R20
245/60R18
Diameter −0.6% · Good fit
285/40R21 → 275/45R20
285/40R21
Diameter +0.8% · Good fit
235/65R18 → 275/45R20
235/65R18
Diameter +1.0% · Good fit
275/45R20 → 235/65R18
235/65R18
Diameter −0.9% · Good fit
275/45R20 → 245/55R19
245/55R19
Diameter +0.5% · Good fit
275/45R20 → 245/45R20
245/45R20
Diameter +3.7% · Marginal fit — proceed with care
275/45R20 → 245/50R20
245/50R20
Diameter +0.3% · Good fit
275/45R20 → 255/50R20
255/50R20
Diameter −1.0% · Good fit
275/45R20 → 255/55R20
255/55R20
Diameter −4.2% · Marginal fit — proceed with care
275/45R20 → 265/45R20
265/45R20
Diameter +1.2% · Good fit
275/45R20 → 265/50R20
265/50R20
Diameter −2.3% · Good fit
275/45R20 → 275/40R20
275/40R20
Diameter +3.8% · Marginal fit — proceed with care
275/45R20 → 285/50R20
285/50R20
Diameter −4.7% · Marginal fit — proceed with care
275/45R20 → 265/40R21
265/40R21
Diameter +1.4% · Good fit
275/45R20 → 265/45R21
265/45R21
Diameter −2.1% · Good fit
275/45R20 → 275/45R21
275/45R21
Diameter −3.3% · Marginal fit — proceed with care
275/45R20 → 285/40R21
285/40R21
Diameter −0.8% · Good fit
275/45R20 → 275/40R22
275/40R22
Diameter −3.0% · Good fit
275/45R20 → 275/55R20
275/55R20
Diameter −6.8% · Not recommended
Common questions
- What is the overall diameter of a 275/45R20 tire?
- A 275/45R20 tire is about 29.74″ (756 mm) in overall diameter, with a sidewall height of 123.8 mm and a circumference of 93.44″.
- How many revolutions per mile does a 275/45R20 tire turn?
- A 275/45R20 turns roughly 678 revolutions per mile (421 per kilometre). This is the number that determines speedometer and odometer accuracy when you change tire size.
- What do the numbers in 275/45R20 mean?
- 275 is the tread width in millimetres, 45 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 275 × 45% = 123.8 mm tall.