Comparison shop every major seller for your exact size — and see how a new size actually fits
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Size/R
📐 Tire Size Comparison
Enter two sizes and see them to scale — side profile and head-on — plus what the change does to your speedometer.
Tire A/R
Tire B/R
Side view (overlaid)
Front view (to scale)
Spec
245/40R18
275/35R19
Overall diameter
25.7"
26.6"
Section width
9.6"
10.8"
Sidewall height
3.9"
3.8"
Circumference
80.8"
83.5"
Revs per mile
784
759
Diameter difference: +3.4% ⚠️ over the ±3% safe range
With Tire B, when your speedometer reads 60 mph you're actually doing 62.0 mph.
Price estimates are street-price guidance — click through to a seller for live pricing on your exact tire. Always verify load index and speed rating against your vehicle's door placard.