Frame

• Pocket bike body work completes the aerodynamic look of a full-size sport bike
  
  The basic mini motorcycle frame is constructed out of steel or aluminum tubes that are bent and welded together to form a double-cradle type frame. The 196cc Warrior from Baja Motorsports is a prime example. Mini dirt bike frames are simply smaller versions of those found on larger dirt bikes and are nearly identical. Pocket bike frames, which are miniature sport bikes, more closely resemble their full-size counterparts by utilizing a tube trellis-type frame. Pocket bikes also incorporate body work, or fairings, to complete the aerodynamic look of a full-size sport bike.
  
  

Suspension

• Forks and frames are rigid, meaning that most mini bikes rely on their tires for shock-absorption
  
  Most mini motorcycles do not utilize any form of suspension with the rear wheel being rigidly mounted to the frame with the front fork and handlebars formed from solid rods. Pneumatic tires provide the only form of shock-absorption for most mini bikes. Mini dirt bikes and larger pocket rockets, however, may be equipped with some form of suspension, such as telescoping forks. Handlebars on these bikes are often mounted from risers on the triple tree or appear as clip-on-type handlebars attached to the front forks.
  
  

Powertrain

• Early and DIY mini bike builders use motors adapted from agricultural tools
  
  Mini motorcycle motors are generally smaller 49cc units, which are often adapted from lawn and yard equipment. These motors are mated to centrifugal clutches, which turn the rear wheel with the use of a drive chain. With the increase in mini motorcycle popularity, several manufacturers have introduced their own purpose-built motors. Ranging between 49 to 125cc and two- or four-stroke single cylinder variations, these fairly simple motors are capable of propelling a mini motorcycle to speeds of nearly 70 mph.
  
  

Brakes

• High-performance braking, derived from full-size sport bikes, are available for pocket bikes
  
  Early mini motorcycles employed drum type-brakes or brakes derived from bicycles, which were adequate for the lower-performance output of the motors. Modern mini motorcycles now incorporate cable-actuated disc-type brakes that allow a higher degree of reliable deceleration. These brake systems are typically mounted at either the front or rear wheel, but are rarely equipped at both ends.
  
  

Modifications

• Big bore kits and upgraded carburetors provide an increase in performance
  
  Modifying mini motorcycles requires only a basic understanding of mechanics and can be an enjoyable hobby. A large selection of aftermarket parts has become available for most mini motorcycles, allowing the owner to increase the performance of the motor easily. Big-bore kits, which increase the internal displacement of the motor, as well as upgraded carburetors can increase the power and top-end speed of a mini bike. Improved tires, such as racing slicks, are also available and offer improved traction and maneuverability.