How it works

TireFlows

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

Try
/R

Result

Diameter

29.95"

Calculated from size marking (math only) — not a fitment guarantee. How it works

Alternate Tire Sizes

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

Tap a size to compare it with your current size

255/65R17+0.33%245/65R17-1.38%225/70R17-1.84%245/70R17+1.84%
Width 9.25 ″Rim 17 ″Dia. 29.95 ″6.48 ″Revs/Mile 673.3Circum. 94.1″
Diameter29.95"
Width9.25"
Sidewall6.48"
Circum.94.099"
Revs/Mile673.3

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