Rake (also called caster) is the angle of a motorcycle’s steering head of the frame (A). Choppers have a lot of rake—their forks stick way out in front. … Think of it as how far the contact patch trails behind the steering axis. Too much trail makes a motorcycle difficult to turn; too little makes it unstable.
How does rake affect handling?
The smaller the rake angle, the less effort is required to turn the steering. Though, the motorcycle will be less stable in a straight line. Conversely, a larger rake angle requires more effort to turn but tends to make the motorcycle more stable at high speeds and helps maintain a straight course.
Is rake the same as offset?
What is fork offset? Offsetting in the crown pushes or pulls the axle farther or closer in. Fork offset — also known as rake — is the distance between the axle and a straight line through the head head tube. Offsetting the fork more (increasing offset) pushes the axle further in front of the head angle.
What is rake and stretch on a motorcycle?
Stretch and Rake:
This repositioning may be done to change the handling characteristics of the motor-cycle, fit the frame to the rider, or more often than not, to give the motorcycle a particular look, i.e. long and low or a high neck.
How do you measure a motorcycle rake?
Raise the bike to an upright position, using a tape measure, hold the tape straight down from the front axle to the floor. Put a mark on the floor at that point. Then place the tape parallel to the steering neck, following the angle of the steering neck all the way up to the floor. Put a mark here also.
What is reverse rake?
reverse rake is when the front of your car sits higher than the rear.
How does ride height affect handling?
Increased ride height: Raises CG, front roll center, and reduces rake. The change will shift weight to the rear, improving the grip of the tires at that end of the car and shifting the handling balance toward UNDERsteer and typically increase aero drag and increase downforce.
What is a fork offset?
Simply put, fork offset, or fork rake, is the distance between the front axle and the steering axis – the imaginary line running straight through the midpoint of the steerer tube. Fork offset is linked to another important measurement: trail. … Higher trail means greater stability and lazier, slower steering.
Does fork offset matter?
Both the headtube angle and fork offset can change the length of the trail number. By making the head tube angle slacker (decreasing the angle) you will make the trail longer. By reducing the fork offset, you will also make the trail longer.
What is the difference between rake and trail?
Rake (also called caster) is the angle of a motorcycle’s steering head of the frame (A). … Trail (B) is measured in distance (inches or millimeters) between the point of the front wheel’s contact with the ground and a line drawn through the axis of the steering head.
What’s the point of stretching a motorcycle?
Stretching a sportbike lowers its stance, which can be further lowered by additional suspension modifications. A lowered stance improves traction, meaning less power is wasted and more power is available to push the bike forward.
What does trail mean on a motorcycle?
Trail, or caster, is the horizontal distance from where the front wheel touches the ground to where the steering axis intersects the ground. The measurement is considered positive if the front wheel ground contact point is behind (towards the rear of the bike) the steering axis intersection with the ground.
How do you measure forks on a motorcycle?
Fork length is measured from the base of the frame neck to the center point of the axle mounting hole. For any off-the-shelf motorcycle this standard measurement for the front forks is considered stock length.
What is a triple tree on a motorcycle?
. Triple Tree (“triple clamp” (US) or “yoke” (UK)) attaches the fork tubes to the frame via steering head bearings, which allow the forks to pivot from side to side, and therefore steer the motorcycle.
How does trail affect bike handling?
Trail is a combination of the head tube angle and the fork rake and can be thought of as the tyre contact point trailing behind the steering axis. The short explanation is a small amount of trail equals a ‘fast’ handling bike, while greater trail equals a ‘slow’ handling bike.