185/70R14 vs 195/65R15Tire Size Comparison

Use Caution

The 3.2% diameter difference exceeds 3% and may affect speedometer accuracy.

Comparison Details

Overall Diameter614.6 vs 634.5 mm (+19.9 mm)

Diameter Difference+3.24%

Section Width185 vs 195 mm (+10 mm)

Sidewall Height129.5 vs 126.8 mm (-2.7 mm)

Circumference1930.8 vs 1993.3 mm

Clearance Change+9.9 mm

Speedometer Error+3.24%

Revs/Mile834 vs 807

Speedometer Correction

When switching from 185/70R14 to 195/65R15, your speedometer will differ from actual speed.

Speedometer	Actual Speed	Difference
30 km/h	31.0 km/h	+1.0 km/h
40 km/h	41.3 km/h	+1.3 km/h
50 km/h	51.6 km/h	+1.6 km/h
60 km/h	61.9 km/h	+1.9 km/h
70 km/h	72.3 km/h	+2.3 km/h
80 km/h	82.6 km/h	+2.6 km/h
90 km/h	92.9 km/h	+2.9 km/h
100 km/h	103.2 km/h	+3.2 km/h
110 km/h	113.6 km/h	+3.6 km/h
120 km/h	123.9 km/h	+3.9 km/h
130 km/h	134.2 km/h	+4.2 km/h

Individual Tire Size Details

Practical Guidance

The 3.2% diameter difference between 185/70R14 and 195/65R15 exceeds the standard 3% tolerance. While physically possible, this change will cause noticeable speedometer error and may affect ABS and traction control calibration. Consult a tire professional before making this switch.

The 3% diameter tolerance is a widely accepted industry guideline referenced by the ETRTO and most vehicle manufacturers. When in doubt, consult your vehicle's owner's manual or a qualified tire professional. For U.S. tire safety standards and recalls, see the NHTSA Tire Safety page.

Frequently Asked Questions

Use Caution. The overall diameter differs by 3.24%, width changes by 10mm.

Speedometer error will be 3.24%. At an indicated 100 km/h, actual speed is about 103.2 km/h.

Ground clearance changes by +9.9mm per side.