I started this bike rack 7+ years ago when I got a new mountain bike with a 20 mm thru axle front fork and wheel. My bike fits in the back of my pickup, under a canopy, so there isn't a lot of head room for my XL bike. The mount has a rare earth magnet on it to hold the hex wrenches that I use for the axle. The bike mount is attached to 3/4 plywood that is fitted to the back of the truck. I also made a front wheel holder that uses a utility magnet to hold the wheel to an in-bed tool box.