Introduction
This document provides guidance on understanding wheel offset, track width, and their implications when modifying your vehicle. It covers legal limits and practical considerations for wheel and tire fitment.
Problem
Modifying wheel offset incorrectly can lead to:
- Illegal track width changes.
- Tire rubbing, especially on vehicles equipped with KDSS (Kinetic Dynamic Suspension System).
- Compromised handling and safety.
Solution
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Track Width Limits: The maximum increase in track width for MC type vehicles is generally 50mm. Reducing track width is illegal.
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Offset and Track Calculation: Changing offset affects track width. A lower offset widens the track, while a higher offset narrows it. The change in track width is equal to twice the difference in offset per axle. For example, changing from +25 to +10 offset results in a 30mm increase in track width.
- Rim Width Consideration: When changing to a wider rim, the track width change is also affected. If the rim is wider, the additional width is distributed equally on both sides of the wheel centerline.
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Using Fitment Tools: Utilize online tools like
http://www.willtheyfit.com/to calculate track changes based on wheel and tire specifications.
Relevant Parts/Specifications
- Standard GXL Wheel Offset: +25 (for a 17"x7.5" wheel).
- Maximum Practical Tire Size (17" Wheels): 285/70/17 (may require modifications).
- Safe Offset Range for 285 Tires (7.5" Wide Wheel): +15 to +18 mm (KDSS considerations apply).
- Example Offset: 17x8 +10 wheel has a 21mm track difference per wheel (42mm total).
- Acceptable Wheel/Tire Combination: Tuff T05 20x9 rims with 275/55R20 BFG KO2’s with a +18 offset.
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