Over the last few years, a big change was made in Mountain Bike fork designs with the 15mm through-hole axle. While this gives a lot more stability for downhill racing and for larger (heavier) riders, it has also proven to be a bit more of a hassle to transport your bike from place to place.
There are conversion kits you can buy from Thule and Yakima, but they are upwards of $40 and clip on to an existing rack system. If you want to mount to a truck bed or SUV floor, then you need to buy two components, totaling ~$80. I went to two local bike shops and a specialty rack shop and no one had what I was looking for so I decided to make a quick stop by the local hardware store and design this on the fly.
Step 1: Parts List
The real magic of this is that the inside diameter of a 1/2" pipe is large enough to have the 15mm axle inserted into it. Most of these pipes have a smooth enough inside surface but I did end up sanding the inside of the pipe a bit so it would not scratch my axle. An alternate design would be to use 1/2" PVC pipe and then have that in a slightly larger galvanized pipe with basically the same deign. That would made since the axle never gets hurt since the PVC is a softer material. I realized this after I did this project but it is really your choice.
My Parts List:
(1) 1/2" diameter, Galvanized pipe "T"
(1) Base / pedestal floor mount
(2) 1/2" diameter Galvanized pipe, 1" in length (you the actual length depends on how tight you wrench it together and how much slop you want.
(1) 1/2" diameter, 2" length (this can vary a few inches depending how high you want it to be, keep it lower for less stress on the part.
(1) Base wood stand (I had a piece of 3/4 plywood (4" wide x 34" long) around so I used that. You could use a 2"x6" if you want. I would keep it at least 36 wide so stays flat on the SUV or truck floor.
(4) 3/4" wood screws
(1) Paint (optional)
(1) Fabric (optional, but it sure makes it look nice)
(1) length of 4" wide, 36" long male Velcro
(1) Spray adhesive (optional, used if you decide to cover the base with fabric)