I have to use some type of physical representation. Either a CAD drawing or welding a bunch of scrap and door hinges together.


The "lifting of the weight" is something I never noticed separately. I notice that head angle alone makes plenty of difference when when building a bike for specific terrain angle and is easiest to find an improvement.

I am working on a linkage that changes a rotary action to a tilting action at specific location. The guy before me gave up when he had four sets of levers/links and still had nothing. It took me a couple of days staring at it making mock-ups before solving the problem with one spherical rod end and one axis (with two bearings) It was a very simple solution but so hard to find. Props to you guys with math skills.



**update! trail calc

http://yojimg.net/bike/web_tools/trailcalc.php