This illustration shows the indepth measurements of most angles in the Saddle Tree Making process creating a balanced frame for a correctly balanced saddle.
The Saddle Tree is the base or, better said, the skeleton of a saddle. In reality that is what we are fitting on both the horse...
and the horseman.
We take the skeletal structure of both to determine the necessary angles and measurements. This is makeing TRUE CUSTOM SADDLES. Just because some saddles are hand made in no way mean they are custom and those claim to make saddles by hand do not even come close to being custom makers without taking these details into consideration.
A persons weight and how its carried on their skeleton makes a factor in horsemanship, over-weight riders can make quite a strain on the horse if not balanced properly. You will see most top riders are at a proper weight for themselves.