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Custom Triple Tree Only Way Out?

  • Thread starter Thread starter drhermanstein
  • Start date Start date
Mike_H said:
Any Idea what kind of trail/rake measurements your going to end up with? By standing the forks up (bringing them closer to perpendicular with the ground) your going to make the bike more "twitchy," i.e. it will have reduced straight line stability, but should lean over into corners with more authority. Thats fine if you want that, but just wanted you to be aware. She's going to ride a lot more like a really heavy crotch rocket now. Depending on how much the 3/4" is going to affect your geometry, you may want to think about a steering damper, and plan your neck changes to incorperate one.
Click to expand...
Steering damper is definitely part of the equation and the increase in "twichiness" is what I would like. I figure that the rake will be 24-25 degrees instead of 28 stock.

Herman
 
drhermanstein said:
from the test fitting and measurements it looks like the bottom of the neck will move out only 7/16ths. I really had interference probs with the tracy body and my GSXR fork tubes.
Click to expand...
So in the end you're just moving the top about 5/16ths further out. Sounds about right for what you're trying to accomplish.
 
Billy Ricks said:
So in the end you're just moving the top about 5/16ths further out. Sounds about right for what you're trying to accomplish.
Click to expand...
The top of the neck will move out 3/4 and the bottom 7/16.

I'm going on the premise that the rake is measured from a theoretical vertical line intersecting the axle and perpendicular to the horizon or a line intersecting the top of the neck and perpendicular to the horizon. Is this correct? I'v always only assumed this but never seen it represented.
 
drhermanstein said:
The top of the neck will move out 3/4 and the bottom 7/16.

I'm going on the premise that the rake is measured from a theoretical vertical line intersecting the axle and perpendicular to the horizon or a line intersecting the top of the neck and perpendicular to the horizon. Is this correct? I'v always only assumed this but never seen it represented.
Click to expand...
Your formula is actually how you measure trail. Rake is simply how far from vertical the neck is. It doesn't take into account things like how much offset the triples present and where the axle sits in the fork. Rake just uses a straight line through the steering head and you would have to have the suspension and wheels mounted to find what vertical is for the bike at the steering head.

http://www.performanceoiltechnology.com/rake_and_trail.htm
 
i had to weld some steering stops onto the lower triple to keep it from hitting the tank.
DSC00043.jpg

the bike steers very quickly and it is very easy to oversteer the bike.
 
Last edited:
Billy Ricks said:
Your formula is actually how you measure trail. Rake is simply how far from vertical the neck is. It doesn't take into account things like how much offset the triples present and where the axle sits in the fork. Rake just uses a straight line through the steering head and you would have to have the suspension and wheels mounted to find what vertical is for the bike at the steering head.

http://www.performanceoiltechnology.com/rake_and_trail.htm
Click to expand...
Awesome. I'm bang on with what they suggest. Thanks so much for that link and info.
 
These are the ones I will be using on my GS1000, they are made for RWU 41mm forks.
000_0155-1.jpg

000_0156.jpg

000_0153.jpg
 
A friend made them for me, he asked what I wanted and modified an existing design that he used for a VJ21 RGV 250. They look far nicer in the flesh, the only downside is that I may have to use clipons and I would prefer proper bars but I am working on a cunning plan:-)

Mark...
 
If I didn't get him to remove so much material from the top yoke it would be a lot easier. I am waiting for some parts to arrive in order to do the drawings of the required parts.

Mark...
 
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