Wheel offset explained
Learn what positive, zero and negative offset mean for wheel position.
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ET 35OFFSET
265/70R17TIRE SIZE
FITMENT EXPLORER
TOOLS & CALCULATORS
Everything you need to compare your setup.
Start with a dedicated calculator and get clear, practical measurements.
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Wheel Offset Calculator
Compare wheel width, offset and spacer changes to understand inner clearance and outer position.
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Tire Size Calculator
Calculate tire diameter, sidewall height, circumference and revolutions per mile.
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Tire Size Comparison
Compare two tire sizes and see the difference in diameter, height and speedometer reading.
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Wheel Fitment Calculator
Review key wheel and tire dimensions before researching a new fitment.
In developmentVEHICLE FITMENT
Your vehicle. Your setup. Better-informed decisions.
Our vehicle specification library is being built with source-aware fitment information. Vehicle-specific recommendations will only be published when the underlying data has been checked.
Start with wheel offsetFITMENT DATABUILDING
Wheel diameter—
Wheel width—
Bolt pattern—
Center bore—
Vehicle database is not yet active. No compatibility claims are made by this preview.
LEARN THE BASICS
Understand the numbers before you change your setup.
Practical explanations to help you interpret tire and wheel measurements.
Tire size explained
Understand width, aspect ratio, rim diameter and the numbers on a tire.
Backspacing vs. offset
See how backspacing and offset describe different wheel measurements.
START HERE