How it works

TireFlows

Get diameter, speedometer impact, and alternate sizes — free, no signup.

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/R

Popular sizes

225/65R17265/70R17245/60R18235/55R19275/55R20215/60R16225/60R18265/65R17

Sample result

Enter your size and tap Calculate above

Diameter

28.52"

Alternate Tire Sizes

Closest diameters (math only · same rim · within 3%)

Tap a size to compare it with your current size

245/60R17+0.21%205/70R17-0.76%215/70R17+1.17%235/60R17-1.45%215/65R17-1.79%235/65R17+1.79%
Width 8.86 ″Rim 17 ″Dia. 28.52 ″5.76 ″Revs/Mile 707.3Circum. 89.6″
Diameter28.52"
Width8.86"
Sidewall5.76"
Circum.89.585"
Revs/Mile707.3

How results are calculated

Tire dimensions are calculated from the metric size format (width / aspect ratio / rim diameter). Diameter, circumference, and revolutions per mile are derived mathematically — no fitment or vehicle data is used.

The 3% rule is a general reference for acceptable diameter difference, not a guarantee. Always check your vehicle manual or consult a tire professional.

How it works