I might ask for a pinch-bolt setup in the future, but the stubby little CroMotor axles limit the material I can get against the flats, and the enclosed axle hole is a stronger design. Plus it prevents the axle from sliding backwards, so the axle nuts will only need to hold the dropouts to the motor, not keep it from moving in the slot, so I can use thicker dropouts and engage less threads.
Besides, these removable dropouts are the only way I'd ever be able to try an enclosed axle hole. I'm aware that its going to be more work during fitment, but once installed I rarely have need to pull a motor back out.
I have asked that the diameter around the axle hole be 2" instead of 1" to have more metal aroound the hole. As Fractal pointed out to me in PM, I'll need to dremel out some materal to keep the wires from being pinched against the dropout.
Magudaman recommend 7075 T651 aluminum, 1/3 the weight and stronger than mild steel.
I was hesitant about ally at first, but after some research I came around. It is already annealed, and because the axle hole is fully enclosed, I am not expecting to see flex in the material. Here are the metal properties he found on a website and forwarded me.
Physical and Mechanical Properties Ultimate Tensile Strength, psi 71,000
Yield Strength, psi 58,200
Brinell Hardness 150
Rockwell Hardness B87
Chemistry Aluminum (Al) 87.1 - 91.4%
Zinc (Zn) 5.1 - 6.1% max
Copper (Cu) 1.2 - 2.0%
Chromium (Cr) 0.18 - 0.28%
Iron (Fe) 0.5 max
Magnesium (Mg) 2.1 - 2.9%
Manganese (Mn) 0.3% max
1018 Mild (low-carbon) steel
Minimum Properties Ultimate Tensile Strength, psi 63,800
Yield Strength, psi 53,700
Rockwell Hardness B71
Chemistry Iron (Fe) 98.81 - 99.26%
Carbon (C) 0.18%
Manganese (Mn) 0.6 - 0.9%
Phosphorus (P) 0.04% max
Sulfur (S) 0.05% max
Finally, on to the pron! I did a test fit with an 5305 (yes, I put it in backwards
) The rear shock isn't in yet, so the frame is where it would be with the rear shock fully compressed, and it looks a bit funny. I should be getting the correct driver for the press to install the FSA 1.5" to 1.125" reducer headset, that will allow me to install the Boxxer's, which also are at an odd angle. You can see how far back the wheel is, with the extra 2" on the dropouts.