Motorcycle Roadworthy and Steering and Handlebar Modifications

Steering and Handlebar Modifications: Maintaining Control and Safety at Ausmec Mobile RWC and Mechanics

At Ausmec Mobile RWC and Mechanics, we understand the desire to personalize your motorcycle for a unique look and feel. However, it's crucial to ensure any modifications to your motorcycle's steering and handlebars comply with Queensland Department of Transport and Main Roads (TMR) regulations ( to maintain safe handling and control.

Here's a breakdown of key TMR guidelines for steering and handlebar modifications:

Steering Gear:

  • Extended Forks: Lengthening your motorcycle's forks can significantly alter handling and put stress on vital components. The TMR strictly discourages such modifications as they cancompromise your safety. Illustration showing the minimum trailIllustration showing the maximum allowable rake
  • Head Stem and Front Wheel Distance: For motorcycles with the steering head stem as the pivot point, the horizontal distance between the center of the front wheel and the midpoint of the head stem bearings must not exceed 550mm.
  • Offset Triple Clamps: These clamps can be used to alter the handlebar position without modifying the frame. They are acceptable, but the trail measurement (distance between the contact patch of the front tire and the point where a line drawn through the steering head intersects the ground) must not be less than 75mm for safe handling.


The regulations for handlebar dimensions and placement depend on whether your motorcycle was manufactured before or after July 1, 1988:

  • Pre-ADR 57/00 Motorcycles (Manufactured before July 1, 1988):

    • The handlebar width (distance between the ends) must be between 500mm and 900mm, excluding mirrors and lights. [Insert Picture of Handlebar Width Measurement]
    • The lowest part of the handgrip cannot be higher than 380mm above the handlebar attachment point on the motorcycle's frame. [Insert Picture of Handlebar Height Measurement]
  • ADR 57/00 Compliant Motorcycles (Manufactured after July 1, 1988):

    • The handlebar width must be between 500mm and 1100mm.
    • The lowest part of the handgrip cannot be higher than 380mm above the lowest part of the rider's seat.
    • All mandatory controls on the handlebars (listed below) must be operable without removing your hand from the grip throughout its entire range of movement.

Mandatory Switchgear on Handlebars (ADR 57/00 Compliant):

  • Left Hand Side:
    • Clutch lever
    • Front brake lever
    • Turn signal control (if fitted)
    • Horn button
  • Right Hand Side:
    • Engine stop button
    • Headlight high/low beam control
    • Turn signal control (if fitted)

How AusmecMobile RWC and Mechanics Can Help:

While we cannot perform modifications that violate TMR regulations, our team of experienced mechanics can assist you in several ways:

  • Expert Advice: We can advise on handlebar and steering modifications that suit your motorcycle model and riding style, ensuring compliance with TMR regulations.
  • Pre-Modification Inspection: Before any modifications, we can thoroughly inspect your motorcycle's steering and handlebar components to ensure they're in good condition.
  • Post-Modification Service: Once you've completed any approved modifications, we can perform a comprehensive service to ensure everything functions correctly and safely.

Safety First:

At Ausmec Mobile RWC and Mechanics, your safety is our top priority. We encourage you to prioritize safe handling and control over purely aesthetic modifications. Our team is here to guide you through the process and ensure your motorcycle remains roadworthy and delivers a comfortable riding experience.

Contact us today to discuss your motorcycle's steering and handlebar modifications!

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