265/70R16 vs 245/75R16
265/70R16 is 0.14 in (0.45%) taller than 245/75R16. Edit either size below to try other combinations.
Metric (265/70R17) or inch (33x12.50R20). Axle ratio is used for the RPM table only.
245/75R16 is 0.14 in (4 mm) shorter than 265/70R16 (−0.5%). With a speedometer calibrated for 265/70R16, an indicated 60 mph is really 59.7 mph. The diameter difference is within ±3%, a range often quoted as a rule of thumb for speedometer and gearing effects.
Geometry only: this does not confirm that a size fits, is approved for or is safe on a particular vehicle. Wheel width and offset, suspension, clearances, load index, speed rating, the vehicle maker's specification and local regulations all apply — check with your owner's manual and a qualified tire professional.
| 265/70R16 | 245/75R16 | Difference | |
|---|---|---|---|
| Diameter | 30.61 in | 30.47 in | −0.14 in (−0.45%) |
| Diameter (mm) | 777 mm | 774 mm | −4 mm |
| Width | 10.43 in | 9.65 in | −0.79 in (−20 mm) |
| Sidewall | 7.30 in | 7.23 in | −0.07 in |
| Rim | 16 in | 16 in | ±0.0 in |
| Circumference | 96.2 in | 95.7 in | −0.43 in |
| Revs per mile | 659 | 662 | +3 |
| Ground clearance change | — | — | −0.07 in |
Speedometer error
| Speedometer shows | True speed on 245/75R16 | Difference |
|---|---|---|
| 20 mph | 19.9 mph | −0.1 mph |
| 30 mph | 29.9 mph | −0.1 mph |
| 40 mph | 39.8 mph | −0.2 mph |
| 50 mph | 49.8 mph | −0.2 mph |
| 60 mph | 59.7 mph | −0.3 mph |
| 70 mph | 69.7 mph | −0.3 mph |
| 80 mph | 79.6 mph | −0.4 mph |
| Speedometer shows | True speed on 245/75R16 | Difference |
|---|---|---|
| 30 km/h | 29.9 km/h | −0.1 km/h |
| 50 km/h | 49.8 km/h | −0.2 km/h |
| 80 km/h | 79.6 km/h | −0.4 km/h |
| 100 km/h | 99.5 km/h | −0.5 km/h |
| 120 km/h | 119.5 km/h | −0.5 km/h |
Assumes the speedometer was accurate on 265/70R16. Factory speedometers often read slightly high on purpose; check against GPS.
Engine RPM and gearing
| Road speed | 265/70R16 | 245/75R16 | Change |
|---|---|---|---|
| 45 mph | 1,843 rpm | 1,852 rpm | +9 rpm |
| 55 mph | 2,253 rpm | 2,263 rpm | +10 rpm |
| 65 mph | 2,663 rpm | 2,675 rpm | +12 rpm |
| 75 mph | 3,072 rpm | 3,086 rpm | +14 rpm |
To restore the original effective gearing on 245/75R16 you would need an axle ratio of about 3.71 — practically the same as now. For overdrive gears multiply the RPM by the gear ratio (e.g. ×0.69).
Other 16-inch sizes within ±3% of 265/70R16
| Size | Diameter | Width | vs original |
|---|---|---|---|
| 285/65R16 | 30.59 in | 11.22 in | −0.06% |
| 335/55R16 | 30.51 in | 13.19 in | −0.32% |
| 245/75R16 | 30.47 in | 9.65 in | −0.45% |
| 235/80R16 | 30.80 in | 9.25 in | +0.64% |
| 305/60R16 | 30.41 in | 12.01 in | −0.64% |
| 215/85R16 | 30.39 in | 8.46 in | −0.71% |
| 315/60R16 | 30.88 in | 12.40 in | +0.90% |
| 345/55R16 | 30.94 in | 13.58 in | +1.09% |
Computed combinations of standard widths and aspect ratios; not every size is manufactured. A similar diameter does not mean a size fits or is approved for your vehicle.
What changes if you switch
- The 0.45% height difference is within ±3%, a range often quoted as a rule of thumb; a speedometer calibrated for 265/70R16 reads about 0.5% high.
- 265/70R16 is 20 mm (0.79 in) wider in nominal section width. Width affects clearance to suspension, frame and body parts and which rim widths the tire maker approves; actual clearance depends on the wheel offset and the vehicle.
- Both sizes are made for 16-inch wheels. Whether a given wheel's width and offset suit 245/75R16 has to be checked against the tire maker's approved rim widths and the vehicle.
Size pages
Related comparisons
Frequently asked questions
Is 245/75R16 bigger than 265/70R16?
265/70R16 is 0.14 in (4 mm, 0.45%) taller than 245/75R16.
Can I replace 265/70R16 with 245/75R16?
This page can only compare dimensions: the diameter difference is 0.45%, within the ±3% often quoted as a rule of thumb. It cannot tell you whether 245/75R16 fits or is approved for your vehicle — that depends on wheel width and offset, suspension and body clearance, the load index and speed rating your vehicle requires, and local regulations. Check your owner's manual and placard and ask a qualified tire professional.
How much does the speedometer change from 265/70R16 to 245/75R16?
It reads high by about 0.45% of the indicated speed: at an indicated 60 mph you are actually doing 59.7 mph (at 100 km/h, 99.5 km/h).
How does 245/75R16 change engine RPM?
Example with a 3.73 axle ratio in direct drive at 65 mph: 2663 rpm on 265/70R16 and 2675 rpm on 245/75R16. Restoring the original effective gearing would take an axle ratio of about 3.71. Enter your own axle ratio in the tool above; this is arithmetic, not a recommendation to change gears.
Nominal geometry for planning only; not fitment advice. See methodology.
Related tools
- Speedometer error calculator
How fast you are really going after a tire change.
- Gear ratio & RPM
Engine RPM and the regear needed for bigger tires.
- Plus size calculator
Sizes that keep your diameter on a bigger or smaller wheel.
- Inch ↔ metric converter
33x12.50R17 to metric and back, with closest equivalents.