Yellow and White Modern Car Rental Logo (3)
Contact us
Fitment & Speedo Calculator

Tire Plus-Sizing & Speedometer Tool

Compare factory vs upgraded tire specs, calculate wheel well clearance, and evaluate speedo offset.

Factory Tire Size
New Upgraded Size
Visual Overlay Comparison
Factory Tire
New Upgraded Tire
61.4 mph
Actual Speed at 60 mph Readout
Your speedometer will read 2.3% slower than your actual vehicle speed.
Overall Diameter
28.5"
+0.7" (+2.5%)
Section Width
225 mm
+20 mm (+9.7%)
Clearance Change
0.35" Less
Wheel Well Gap
Revs Per Mile
708
-18 Revs/Mi

Dimension Breakdown

Spec Factory New Size
Diameter 27.8 in 28.5 in
Width 205 mm 225 mm
Sidewall Height 4.4 in 4.9 in
Circumference 87.3 in 89.5 in

Fitment & Risk Check

  • Clearance Check: A diameter increase > 3% may cause rub against plastic fender liners or struts during tight turns.
  • Speedometer Offset: Ensure your speedo calibration is updated if off-roading or running non-standard tire diameters.
  • Brake System: Larger diameter wheels increase rotating mass, slightly increasing braking distance.