75 Motorcycle Front End Geometry
The distance between the front axle and the forks steering axis the line running through the centre of the head tube about which the fork rotates when steering. If you for example plan on using the front end off a standard road bike on your trike then you will want to make sure that the frame of the trike has the same raked steering neck as the original donar bike otherwise your likely to end up with a trail measurement that is a mile out which is why most people that increase the rake angle end up making a leading link front end because as youll see later re.
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By balancing the geometry of your bike you are ensuring your bike rides comfortably and performs at its best.
75 motorcycle front end geometry. With the front wheel off of the ground grab the front end by the lower shock legs just above the swingarm and pull gently. Taking accurate measurements not only ensures that the front end will be the correct length but that the frame geometry is correct as well. Your front suspension geometry is defined by the following six variables which are.
The FXDWG uses 3 degree trees. The distance between the centers of rotation for the front and rear wheels - that is the distance between the front and rear axle. As noted in this great video overview there are aspects of a motorcycle that affect how it rides like the angle of the forks in the triple tree the distance from the steering head to the ground.
Centerline of the top steering neck to the centerline of the top of the fork tubes. Typical numbers are 55 to 58 inches for mid-size and larger street sporting motorcycles 52 to 54 inches for 250 or 500cc Grand Prix bikes. Length will not change trail if the triple trees are not raked.
Rake Trail and Offset. The diagram below shows the offset distance of the front wheel geometry. This section will cover front geometry and how to adjust it.
The distance between the top of the fork tubes to the centerline of the axle. Hayabusa forks are 285. Because alignment deals with angles and affects steering the method of describing alignment measurements is called steering geometry.
The trail of a motorcycle is defined as the distance measured form the center of the front tires contact patch to the ground and the point where an imaginary line passing through the center of. Once again its technology borrowed from another form of racing. Alternatively it is the distance from the steering stem to the fork centre line.
There are 3 main areas of geometry for the front wheel. Frame geometry is an important factor when changing front ends. This will explain three parts.
STEERING GEOMETRY The term steering geometry also known as front-end geometry refers to the angular Relationship between suspension and steering parts front wheels and the road surface. Harley forks are in the 30 32 34 or longer range. Do you feel a click or movement in the front end.
With the engine off push the bike and apply a bit of front brake. For standard triple trees enter 0 degrees. Dont pull it off of the center stand.
Aero came from Formula 1 the holeshot device from motocross and the geometry adjuster from mountain-biking. Length from to top of the fork tubes to the centerline of the axle. The angle in degrees of the steering neck from vertical.
Motorcycle geometry covers two areas of the bike front end geometry and rear end geometry. Its also important for the front end to work with the front wheel tire and the frame. For now this article will focus solely on the front-end geometry of the motorcycle.
Offset is the distance from the steering axis to the centre line of the front axle. The front-centre distance always depends upon the reach of the frame however a slack head tube angle andor more fork rake will push the front wheel further away from the bottom bracket. When installing a Lowering Link Lowering Pull Rod or lowering the rear end of your motorcycle by suspension you may need to lower the front end of your bike as well in order to balance the geometry of your bike.
DallIgnas latest gadget is the logical next step from his holeshot device and does a similar job by changing the motorcycles geometry and centre of gravity during the corner-exit phase.
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