Specifications & fitment tools

Know it fits before you buy. Every calculator uses the standard geometry that tire shops use.

Compare a new wheel's width, offset, bolt pattern and center bore with stock. See poke and inner clearance in millimetres.

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Compare two tire sizes: diameter difference, speedometer error, ride-height change and rim-width range with a ±3% verdict.

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Pick two vehicles and check whether wheels from one will bolt onto the other — bolt pattern, hub bore, thread and offset.

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Decode any size such as 225/45R17 into overall diameter, sidewall height, circumference and revolutions per mile.

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