It seems like this road frame has been more difficult to get started than corraling a bunch of cats with a hyena by my side, regardless, it's finally moving.
I had talked with Chad about the final geometry; he is a fast club rider in Texas who typically turns out 30-50 mile rides on flat to rolling terrain at a nice clip. Hindered by standard geometry that allows for appropriate standover but extends his cockpit longer than desired, we've designed a position that will accomodate his long legs and shorter torso, position him balanced between the axels to provide both comfort and performance. The bike is on the sporty side of handling, but will still maintain the stability he needs when he's turning mile 80 of the Hotter then Hell 100 and his mind is fried from the waves of inhuman heat rising from the pavement :)
The bike will be a titanium road frame with a slightly sloping top tube, oversized down tube for controlling the torsional twist put out by his powerful size, and utilizing smaller diameter seat stays for a bit of vertical compliance and comfort. With the end goal in mind, here's the numbers we'll be working with...
So, let's get started setting up the fixture, shall we?
To begin, the bottom bracket is in a fixed position, so the axel position needs to be adjusted front and rear to accommodate for the necessary drop, or difference between axel and bottom bracket height. The fixture is designed so that each adjustment has a dedicated measurement point utilizing calipers, there is never any opportunity for variance from the actual position due to a visual scale and indicator arrow like many designs. Here I'm setting the rear axel position to our intended 68mm of bottom bracket drop. The "T" allen wrench in the bottom of the picture is moving the tower using an internal lead screw, so you are not fighting gravity or friction when trying to dial in the position.
I can then adjust my seat and head tube angles, once again utilizing the calipers and the degree equivelency chart. Setting the head tube angle to 73.25 degrees...
So let's start cutting some tubing...here's some head tube stock in it's raw form, measured and ready for the cold saw.