Fitment helper
Compare wheel changes before you quote.
Enter your current wheel and tyre size, then test the setup you are considering. See poke, inner clearance, rolling diameter, and speedometer change.
What this compares
Use this when you know your current wheel and tyre size. Compare poke, inner clearance, rolling diameter, and speedometer change.
Try a preset
Cross-section · axle view from behind · hub centre reference
Diameter Difference
+13.9 mm
New tyre is taller — higher than stock
Stance Difference
+11.4 mm
More poke — outer lip further out
Inner Clearance
+1.4 mm
Slight extra intrusion — check clearance
Speedo Error
+2.15 %
2.1% deviation — noticeable, tune recommended
Ready for a sanity check?
Send these calculated numbers with your vehicle details so MonzaWheels can confirm brake clearance, offset, and final pricing.
Calculation breakdown
Current
Wheel width: 241.3 mm
Wheel diameter: 482.6 mm
Sidewall height: 82.3 mm
Overall diameter: 647.1 mm
Overall radius: 323.5 mm
Outer from hub: 85.6 mm
Inner from hub: 155.6 mm
New
Wheel width: 254.0 mm
Wheel diameter: 508.0 mm
Sidewall height: 76.5 mm
Overall diameter: 661.0 mm
Overall radius: 330.5 mm
Outer from hub: 97.0 mm
Inner from hub: 157.0 mm
Next step
Not sure what the numbers should be? Send the car and we will resolve the fitment for you.