155/65R13 vs 155/70R13
Side-by-side comparison of overall diameter, sidewall height, speedometer error, and ride-height change.
Borderline — Check wheel-arch clearance and reset TPMS before fitting.
To scale
155/65R13
- Section width
- 155 mm
- Aspect ratio
- 65%
- Rim diameter
- 13"
- Sidewall
- 100.8 mm
- Overall diameter
- 531.7 mm
- Circumference
- 1670 mm
- Revs / mile
- 963
- Revs / km
- 599
155/70R13
- Section width
- 155 mm
- Aspect ratio
- 70%
- Rim diameter
- 13"
- Sidewall
- 108.5 mm
- Overall diameter
- 547.2 mm
- Circumference
- 1719 mm
- Revs / mile
- 936
- Revs / km
- 582
Difference
- Overall diameter
- +15.5 mm (+2.92%)
- Sidewall height
- +7.8 mm
- Tread width
- +0 mm
- Ride height (axle)
- +7.8 mm
- Speedometer error
- +2.92%
- At indicated 60 mph
- actual 61.7 mph
- At indicated 100 km/h
- actual 102.9 km/h
Will 155/70R13 fit instead of 155/65R13?
The overall diameter changes by 2.92%. Most manufacturers consider a swap acceptable when the difference stays under 3% — beyond that, you may see speedometer error, ABS/TPMS warnings, or wheel-well clearance problems. This page only covers the math; your vehicle's wheel arches, suspension geometry, and load rating still matter.
What the numbers mean
- Overall diameter — outside-to-outside height of the tire. Affects ride height, gearing, and speedometer calibration.
- Sidewall height — rubber from rim edge to tread. Lower sidewall gives sharper steering response but a harsher ride.
- Speedometer error — how far off your indicated speed will be after the swap. Positive means the speedo under-reads (actual speed is higher than shown).