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The frame size number comes from the length of the seat tube. The seat tube is that nearly vertical tube of the three big tubes that make up the "main triangle" of the bike frame. The seat tube has the bike's saddle attached at the top, and has the pedals and crank arms attached at the bottom. A short seat tube will make the pedals closer to the saddle; a long seat tube will make the pedals further away. The frame size number is the length from the center of the crank arm spindle (the axle that holds the two crank arms together) up to the top of the seat tube (where the saddle and seatpost are attached). On some bikes this is measured in inches, on others in centimeters.
But that's not the only dimension that changes for different frame sizes. As bicycle frames get taller, they also get longer. That means the distance from the saddle to the handlebars gets longer. This makes sense, since tall people don't just have longer legs than short people. They usually also have longer arms, a longer torso, and so on. So the bike frame also needs to get longer in every direction for a taller rider, not just longer from pedal to saddle. The top tube gets longer, which pushes the handlebars further away from the saddle. The head tube (the frame part that the fork attaches to) gets taller, so the handlebars will be higher up. All of these dimensions and more are fine tuned in every frame size, so the right size frame for a person's height fits well everywhere, not just in the saddle.
Get the bike up off the ground and make sure it's secure. Remove the rear wheel and the rear shocks. Look for anything else that may be attached to the swing arm such a brake rod return springs etc.
Once you have everthing off the swing arm, take the pivot bolt out and the swing arm with the bearings slides off the frame. Remvove the screw and lockwasher, bearing lockwasher, the right bearing locknut, and the bearing outer spacer. Using a punch, turn out the left bearing locknut from the fork hub and remove the spacer. From inside the fork, press or drive out the bearings and bearing spacers by applying pressure against the spacer. Press or drive out the bearing shields from fork inner side.
Frame "rake" is determined by the angle of the neck section of the frame itself relative to the ground/earth. Triple trees are in front of the steering stem (or neck "axle/axis") does not define or affect the "rake" of the frame. Almost every other motorcycle manufacturer places the triple trees in front of the frame's neck axis, In 1980 H-D developed the "self-centering" type of triple trees, where the trees lay/fall behind the neck's axis. This type of front end design is very stable because the "weight" or mass of the assembly being behind the neck will "come back to center" while moving forward down the road.
If the bike was wrecked cheking the frame is simple, look for any paint popping off, especially around the neck where the fork attaches, if the paint is popped the frame is bent, if not the frame is good.
There can be many reasons , so you will need to check down the list until the problem is solved.
incorrect tyre pressure
worn wheel bearings
worn\loose steering head bearings
loose axle nut
worn swing arm bearings
bent disc rotors
front suspension damping too soft,
loose handle bars
bent forks or frame
Better start checking everything. depending on the severity of the wobble, it may just need something simple like a new tyre. But all of the following can cause a problem
tyre pressures\and balance\incorrect sizes
wheel bearings front and rear
spoke tension( if it has spokes)
Head bearings\twisted forks
swing arm bushes
change front fork oil\check suspension settings
loose axle bolts
string line the wheels
bent frame or forks
Bad, mismatched, improper tires, Wheel bearings, wheel bearing preload
adjustment steering head bearings, steering head preload adjustment.
misaligned wheels swing arm bushings or bearings, swing arm bearing
preload, worn defective shock, bent frame, rims. forks. misaligned
forks. fork stiction.
Prevention is in making all above are correct., a steering damper won't fix it, it will only hide the problem!!!