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Oregon Parks and Recreation Department: ATVs

Rider Fit
A Class I operator (quad rider), under the age of 16, must meet all the following minimum physical size requirements (Rider Fit) in relationship to the vehicle:
 


Diagram illustrating proper brake reach. Diagram illustrating proper leg length and grip reach Diagram illustrating proper handle bar turning reach. 
Brake reach
Leg length & grip reach
Handle bar turning reach
  1. Brake Reach: With hands placed in the normal operating position and fingers straight out, the first joint (from the tip) of the middle finger will extend beyond the brake lever and clutch.
  2. Leg Length: While sitting and with their feet on the pegs, the knee must be bent at least 45 degrees.
  3. Grip Reach: While sitting upright on the quad with hands on the handle bars and not leaning forward, there must be a distinct angle between the upper arm and the forearm, and;
  4. The operator must be able to turn the handle bars from lock to lock while maintaining grip on the handle bars and maintaining throttle and brake control.
  5. Disabled operators are allowed to use prosthetic devices or modified or adaptive equipment to achieve rider fit.