Computed tire swap
245/70R16 vs 265/70R16
Diameter +3.74% · Speedo at 60 mph reads 62.2 mph actual · Ground clearance +14.0 mm
Methodology: this page compares ETRTO-derived tire dimensions, circumference, speedometer error, and the TreadSize 3% diameter rule. Last reviewed June 2026 by the TreadSize editorial team.
Caution — review clearance and calibration
The 3–5% diameter difference may affect speedometer accuracy and ABS calibration noticeably. Fitment is possible on many vehicles but should be verified for wheel-well clearance and approved by a tire professional.
Visual diameter overlay
Fitment risk beyond diameter
High fitment risk
- Diameter exceeds the common 3% rule; speedometer, ABS, and stability-control calibration need review.
- New tire is 20 mm wider; check inner strut clearance, fender clearance, and wheel offset.
- Always compare against the vehicle door-placard OE size, load index, and speed rating before buying.
Speedometer effect
When the vehicle's speedometer (calibrated to 245/70R16) reads 60 mph, the actual speed with 265/70R16 mounted is:
Speedometer error: +3.73% · Odometer reads high by 3.73%
Full comparison
| Measurement | 245/70R16 | 265/70R16 | Delta |
|---|---|---|---|
| Overall diameter | 29.50" | 30.61" | +3.74% |
| Section width | 245 mm | 265 mm | +20 mm |
| Sidewall height | 171.5 mm | 185.5 mm | +14.00 mm |
| Rim diameter | 16" | 16" | +0" |
| Circumference | 2354 mm | 2442 mm | +88 mm |
| Revs / mile | 684 | 659 | -25 |
| Ground clearance change | +14.0 mm | ||
Questions about this swap
What is the diameter difference between 245/70R16 and 265/70R16?
265/70R16 is 3.74% larger in overall diameter than 245/70R16 — a difference of 28.0 mm (1.10 inches).
How does 265/70R16 affect the speedometer if the car was calibrated for 245/70R16?
When the speedometer reads 60 mph (calibrated for 245/70R16), the actual speed with 265/70R16 is 62.2 mph — an error of +3.73%.
Is it safe to replace 245/70R16 with 265/70R16?
Caution — review clearance and calibration. The 3–5% diameter difference may affect speedometer accuracy and ABS calibration noticeably. Fitment is possible on many vehicles but should be verified for wheel-well clearance and approved by a tire professional.
All calculations use standard ETRTO formulas. Confirm fitment with a qualified tire professional and your vehicle's door-placard before purchasing.