A stock setup with normal rake and trail dimensions. With the trail dimension somewhere between 2 to 4 inches, the bike will handle easily at both high and low speeds. Flowing smoothly through curves without swaying or wobbling.
The rake angle is increased at the neck. If the trail dimension is too great, the bike will handle sluggishly at high speeds. It will seem almost too steady. You will have trouble balancing your bike at lower speeds, or on winding roads. It will feel generally sluggish and clumsy.
The rake angle is increased at the trees. With too little and in extreme cases negative trail, (steering head angle point falls behind the front axle point), the bike will handle with unbelievable ease at low speeds, but be completely out of balance at high speed. It will easily develop a fatal high-speed wobble. Extremely dangerous!
Offset-- Centerline of top of steering neck to centerline of top of fork tubes.
Rake-- The angle in degrees of the steering neck from the vertical.
Fork Length-- The distance between the top of the fork tubes to the centerline of the axle.
Diameter of the front tire.
Trail: Distance defined by vertical line from axle to ground and intersect of centerline of steering neck and ground.
Raked Triple Trees-- In order to bring trail figures back into line, triple trees with raked steering stems can be used. Expressed in degrees.