FitmentHub

Wheel & Tyre Calculator

Compare specs against factory fitment before you buy

Enter your factory (OEM) specs first, then add aftermarket options to compare diameter, sidewall, speedometer error and offset.
Factory

Visual Comparison

Factory
Option A
↑ Front view  |  Side profile

Specification Comparison

SpecFactoryOption A
Rim Diameter——
Rim Width——
Offset (ET)——
Bolt Pattern——
Tyre Size——
Sidewall Height——
Overall Diameter——
Circumference——
Speedo ErrorBaseline—

Offset (ET) Guide

Higher ET

Wheel sits closer to centre — less poke

Matching ET

Same as factory — OEM fitment

Lower ET

Wheel sits further out — more poke

⚠️ Speedo error over ±2.5% may affect legality. Always verify fitment with a professional before purchasing.