Wheel Offset Calculator
Changing wheel width or offset changes how your wheels sit — how far they poke toward the fender and how much clearance they leave for suspension and brakes. Enter your current and new wheel width and offset (ET) to see the difference in poke, inner clearance and backspacing before you order.
Outer edge (poke)
+27.7 mm
sticks out more
Inner clearance
+2.3 mm
more clearance
New backspacing
6.18″
9″ × ET30
A positive poke means the wheel sits further out toward the fender; less inner clearance means the wheel moves closer to your suspension and brakes. These are guidance figures — always confirm real clearance, rubbing and fitment with a wheel specialist before ordering.
FAQ
What is wheel offset (ET)?
Offset, marked ET in millimeters, is the distance from the wheel's mounting face to its centerline. A higher (more positive) ET tucks the wheel inward; a lower or negative ET pushes it outward toward the fender for more poke.
What does negative offset do?
Lowering offset toward negative moves the wheel outward, increasing poke and a more aggressive stance, but it can cause fender rubbing and adds stress to bearings. Always confirm clearance before fitting.
What is backspacing?
Backspacing is the distance from the mounting face to the inner edge of the wheel — another way to express fitment that matters for suspension and brake clearance. This calculator estimates it from your width and offset.
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