175/70R14 vs 185/70R14
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
175/70R14
- Section width
- 175 mm
- Aspect ratio
- 70%
- Rim diameter
- 14"
- Sidewall
- 122.5 mm
- Overall diameter
- 600.6 mm
- Circumference
- 1887 mm
- Revs / mile
- 853
- Revs / km
- 530
185/70R14
- Section width
- 185 mm
- Aspect ratio
- 70%
- Rim diameter
- 14"
- Sidewall
- 129.5 mm
- Overall diameter
- 614.6 mm
- Circumference
- 1931 mm
- Revs / mile
- 834
- Revs / km
- 518
Difference
- Overall diameter
- +14.0 mm (+2.33%)
- Sidewall height
- +7.0 mm
- Tread width
- +10 mm
- Ride height (axle)
- +7.0 mm
- Speedometer error
- +2.33%
- At indicated 60 mph
- actual 61.4 mph
- At indicated 100 km/h
- actual 102.3 km/h
Will 185/70R14 fit instead of 175/70R14?
The overall diameter changes by 2.33%. 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).