245/75R16 vs 265/70R16
265/70R16 is +0.14 in (+0.5%) in diameter and 0.79 in wider than 245/75R16.
Size comparison245/75R16
| Dimension | 245/75R16 | 265/70R16 | Difference |
|---|---|---|---|
| Overall diameter UN R30 §6.1.2.1 | 30.47 in 773.9 mm | 30.61 in 777.4 mm | +0.14 in |
| Section width UN R30 §6.1.2.1 | 9.65 in 245.0 mm | 10.43 in 265.0 mm | +0.78 in |
| Sidewall height UN R30 §6.1.2.1 | 7.23 in 183.8 mm | 7.30 in 185.5 mm | +0.07 in |
| Rim diameter Marked on the tire | 16 in | 16 in | 0 in |
| Circumference From diameter | 95.72 in | 96.15 in | +0.43 in |
| Revolutions per mile From diameter | 662 | 659 | −3 |
| Allowed real diameter UN R30 §6.1.5 | 30.03–31.05 in | 30.17–31.19 in |
Nominal, not measuredReal tires vary by brand and load range.
- 245/75R16 30.47 in
- 265/70R16 30.61 in
Speedometer change
mph
If your speedometer is calibrated for 245/75R16 and you fit 265/70R16, the tire is +0.5% in diameter, so your true speed differs from the reading as shown below.
| Reading | True speed | Difference |
|---|---|---|
| 30 mph | 30.1 mph | +0.1 mph |
| 45 mph | 45.2 mph | +0.2 mph |
| 55 mph | 55.2 mph | +0.2 mph |
| 60 mph | 60.3 mph | +0.3 mph |
| 70 mph | 70.3 mph | +0.3 mph |
| 80 mph | 80.4 mph | +0.4 mph |
What changes
- Ride height changes by +0.07 in at the axle (half the diameter change).
- 265/70R16 is the taller tire.
- Revolutions per mile change by -3.
Nominal dimensions from the official sizing formula (sources below). This comparison doesn't check fit: wheel width, offset and clearance decide that. See changing tire size.
Each size
Printed from https://tiresizecalc.net/compare/245-75r16-vs-265-70r16/. Figures as published on 2026-11-01. The full working and the official sources are on that page.
Sources
- UN Regulation No. 30 - Uniform provisions concerning the approval of pneumatic tyres for motor vehicles and their trailers (Revision 3). United Nations Economic Commission for Europe (UNECE). E/ECE/324 E/ECE/TRANS/505 Rev.1/Add.29/Rev.3. 2007-03-29. Para 2.15 and 6.1.2.1: aspect ratio and outer diameter, D = d + 2H. Retrieved 2026-11-01.
- UN Regulation No. 54 - Uniform provisions concerning the approval of pneumatic tyres for commercial vehicles and their trailers (Revision 2). United Nations Economic Commission for Europe (UNECE). E/ECE/324 E/ECE/TRANS/505 Rev.1/Add.53/Rev.2. 2004-04-16. Para 6.1.2.1: the same formula for light truck tires. Retrieved 2026-11-01.
- UN Regulation No. 30 - Uniform provisions concerning the approval of pneumatic tyres for motor vehicles and their trailers (Revision 3). United Nations Economic Commission for Europe (UNECE). E/ECE/324 E/ECE/TRANS/505 Rev.1/Add.29/Rev.3. 2007-03-29. Para 6.1.5: allowed outer diameter, Dmin = d + 2H x 0.97, Dmax = d + 2H x 1.04. Retrieved 2026-11-01.
- Computed by tiresizecalc.net from the cited formula. Sri Murugan Systems. Circumference = pi x diameter; revolutions per mile = 63,360 / circumference; 1 in = 25.4 mm exactly. Retrieved 2026-11-01.
- Computed by tiresizecalc.net from the cited formula. Sri Murugan Systems. Speedometer: true speed = indicated speed x new diameter / old diameter. Retrieved 2026-11-01.
Last reviewed 2026-11-01. The full source list, with dates and file checksums, is in How the numbers are calculated. To report an error, email contactus@tiresizecalc.net.