255/35R20
Common fitments: Mustang Mach 1, Camaro SS
Overall diameter
27.03″
687 mm
Sidewall height
3.51″
89.3 mm
Tread width
255 mm
10.0″
Circumference
84.91″
7.1 ft
Revs per mile
746
464 per km
Wheel diameter
20″
aspect ratio 35%
Cross-section
- Overall diameter
- 27.03″
- Sidewall (each side)
- 3.51″
- Wheel
- 20″
255/35R20 compared with other sizes
All 24 practical swaps involving 255/35R20 — diameter change, speedometer impact and a fit verdict for each.
255/35R20 → 235/50R18
235/50R18
Diameter −0.8% · Good fit
255/35R20 → 245/40R19
245/40R19
Diameter +1.2% · Good fit
255/35R20 → 255/40R19
255/40R19
Diameter −0.0% · Good fit
255/35R20 → 245/35R20
245/35R20
Diameter +1.0% · Good fit
245/35R20 → 255/35R20
245/35R20
Diameter −1.0% · Good fit
265/35R20 → 255/35R20
265/35R20
Diameter +1.0% · Good fit
275/35R20 → 255/35R20
275/35R20
Diameter +2.0% · Good fit
245/40R20 → 255/35R20
245/40R20
Diameter +2.5% · Good fit
255/40R19 → 255/35R20
255/40R19
Diameter +0.0% · Good fit
255/45R18 → 255/35R20
255/45R18
Diameter +0.0% · Good fit
295/35R20 → 255/35R20
295/35R20
Diameter +4.1% · Marginal fit — proceed with care
235/50R18 → 255/35R20
235/50R18
Diameter +0.8% · Good fit
235/45R19 → 255/35R20
235/45R19
Diameter +1.1% · Good fit
245/40R19 → 255/35R20
245/40R19
Diameter −1.2% · Good fit
245/45R18 → 255/35R20
245/45R18
Diameter −1.3% · Good fit
235/40R19 → 255/35R20
235/40R19
Diameter −2.3% · Good fit
275/40R19 → 255/35R20
275/40R19
Diameter +2.3% · Good fit
245/45R19 → 255/35R20
245/45R19
Diameter +2.4% · Good fit
255/35R20 → 295/35R20
295/35R20
Diameter −3.9% · Marginal fit — proceed with care
255/35R20 → 255/45R18
255/45R18
Diameter −0.0% · Good fit
255/35R20 → 245/40R20
245/40R20
Diameter −2.5% · Good fit
255/35R20 → 265/35R20
265/35R20
Diameter −1.0% · Good fit
255/35R20 → 275/35R20
275/35R20
Diameter −2.0% · Good fit
255/35R20 → 275/55R20
275/55R20
Diameter −15.3% · Not recommended
Common questions
- What is the overall diameter of a 255/35R20 tire?
- A 255/35R20 tire is about 27.03″ (687 mm) in overall diameter, with a sidewall height of 89.3 mm and a circumference of 84.91″.
- How many revolutions per mile does a 255/35R20 tire turn?
- A 255/35R20 turns roughly 746 revolutions per mile (464 per kilometre). This is the number that determines speedometer and odometer accuracy when you change tire size.
- What do the numbers in 255/35R20 mean?
- 255 is the tread width in millimetres, 35 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 255 × 35% = 89.3 mm tall.