What is the diameter difference between 195/65R15 and 215/55R17?

195/65R15 has an overall diameter of 24.98 inches (635 mm). 215/55R17 is 26.31 inches (668 mm). That's a 1.33 inch (34 mm) difference — 215/55R17 is taller.

Will 215/55R17 cause speedometer error on a car fitted with 195/65R15?

Swapping 195/65R15 for 215/55R17 produces a speedometer error of about 5.3%. Your speedometer will read lower than your actual speed — a 60 mph indicated reading is really 63.2 mph. Anything under 3% is usually acceptable without recalibration.

How many revolutions per mile does each size do?

195/65R15 turns 807 revs per mile. 215/55R17 turns 767 revs per mile. Taller tyres turn fewer times per mile, which lowers effective final-drive ratio.

What's the sidewall height difference?

195/65R15 has a sidewall of 127 mm (4.99 in). 215/55R17 sidewall is 118 mm (4.66 in). Lower-profile sidewalls give sharper steering response but less bump compliance.

Is 215/55R17 a safe plus-size upgrade from 195/65R15?

A plus-size upgrade is considered safe when overall diameter stays within ±3% — here the difference is 5.3%. This swap is outside the typical ±3% safe range and may require speedometer recalibration or affect ABS / traction control behaviour.

Tire size comparison

195/65R15 vs 215/55R17

Overall diameter, sidewall, revs per mile, and speedometer error — 215/55R17 is the taller tire, with a 5.3% speedo delta when swapping.

195/65R15

24.98in

635 mm overall diameter

215/55R17

26.31in

668 mm overall diameter

Diameter Δ

1.33 in

Speedo error

5.3%

195/65R15 revs/mi

807

215/55R17 revs/mi

767

Outside the typical ±3% safe plus-size band — you may want speedometer recalibration, and this change can affect ABS or traction control behaviour.

Full spec

Side by side

Metric	195/65R15	215/55R17
Section width	195 mm	215 mm
Aspect ratio	65	55
Wheel diameter	15″	17″
Sidewall height	127 mm	118 mm
Overall diameter	24.98 in (635 mm)	26.31 in (668 mm)
Circumference	78.48 in	82.66 in
Revolutions / mile	807	767

Other comparisons for these sizes

195/65R15 vs 205/60R16 195/65R15 vs 205/65R15 195/65R15 vs 195/60R15 205/60R16 vs 215/55R17 215/60R16 vs 215/55R17 215/55R17 vs 235/55R17 215/55R17 vs 215/50R17 215/55R17 vs 225/50R17

FAQ

Frequently asked

What is the diameter difference between 195/65R15 and 215/55R17?: 195/65R15 has an overall diameter of 24.98 inches (635 mm). 215/55R17 is 26.31 inches (668 mm). That's a 1.33 inch (34 mm) difference — 215/55R17 is taller.
Will 215/55R17 cause speedometer error on a car fitted with 195/65R15?: Swapping 195/65R15 for 215/55R17 produces a speedometer error of about 5.3%. Your speedometer will read lower than your actual speed — a 60 mph indicated reading is really 63.2 mph. Anything under 3% is usually acceptable without recalibration.
How many revolutions per mile does each size do?: 195/65R15 turns 807 revs per mile. 215/55R17 turns 767 revs per mile. Taller tyres turn fewer times per mile, which lowers effective final-drive ratio.
What's the sidewall height difference?: 195/65R15 has a sidewall of 127 mm (4.99 in). 215/55R17 sidewall is 118 mm (4.66 in). Lower-profile sidewalls give sharper steering response but less bump compliance.
Is 215/55R17 a safe plus-size upgrade from 195/65R15?: A plus-size upgrade is considered safe when overall diameter stays within ±3% — here the difference is 5.3%. This swap is outside the typical ±3% safe range and may require speedometer recalibration or affect ABS / traction control behaviour.