Picture of Unicycle rack for a motorcycle (the UniRack)
How to build a unicycle rack for a Harley Davidson motorcycle. Don't let riding your motorcycle stop you from riding your unicycle! Supports both a 20" trials unicycle, and also a standard 24" mountain unicycle.
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Step 1: Cut up an old bicycle

Picture of Cut up an old bicycle
First off, you need some steel. I used an old bicycle and cut it up with a sawzall. After cutting the steel into manageable lengths, it is a good idea to remove the paint.

Step 2: Figure out where to mount it

Picture of Figure out where to mount it
Figure out a good spot on the motorcycle to mount the rack. For my Harley Sportster, that was on the rear shock mount. Heat up the end of one of the tubes with a torch and flatten it it out on an anvil. Then drill a hole that will allow your bolt to pass through

Step 3: Weld a simple square together

Picture of Weld a simple square together
Basically, you are welding a simple square together. Mount the two pieces you cut in the previous step to the side of the motorcycle and cut a piece that fits in the middle. Cut it off at a 45 degree angle and weld it together.

Step 4: Weld a vertical post to the top of the square box

Picture of Weld a vertical post to the top of the square box
Next, you want something to hold the frame to. So, take a piece of tubing and cut a semicircle on it. I used a dremal, which isn't the easiest way to do it, but works. Weld the post vertical, and test fit the unicycle to it with a bungee cord.

Step 5: Weld on a horizontal post

Picture of Weld on a horizontal post
Next, you need to find the good spot to place a horizontal post. To make it work with a 20" and a 24" uni, I had the post just above the tire on a 20", and just below the rim on a 24" (going through the spokes -- see the last picture). After you find the sweet spot, cut the two posts to fit at 45 degree angles and weld them together. I had the angles with the horizontal tube pointing slightly upward to hold it together a little tighter.

Step 6: Weld on some nubs for bungee cord attachment

Picture of Weld on some nubs for bungee cord attachment
Finally, weld on some nubs for bungee cord attachment. I made these by bending some steel over in half, and then cutting the resulting half circle out.
Interesting example of a purpose-built rack. You are very good at welding, as bike tubing is very thin. I would be careful of a wheelie, though. If you go over backwards with this arraignment, you will break your spine.
Good Luck, and keep thinking!!
GibbonsRock7 years ago
Very fun! My favorite term in the world is now: "standard 24" mountain unicycle." I simply had no idea mountain unicycles had been efficiently standardized! Actually, I had no idea there WERE mountain unicycles! Learning about unicycles was as fun as the instructible! But now I'm off to hit the slopes with my standard 11.5" mountain roller skates. (joking, but now wouldn't be surprised if actually ARE such things as mountain roller skates) Cheers! -Jim
wouldnt 11.5" roller skates have crazy huge wheels??
that would be a size 11.5 shoe if I'm not mistaken.
now i feal stupid :(
Actually, the standard is 8 inch.
CorbinsTreehouse (author)  GibbonsRock7 years ago
LOL! Yeah, mountain unicycling, or muni, is quite popular now. Check out for popular flavors.
biphenyl6 years ago
Amazing! Had I a motorcycle I'd Muni all the time just to show this thing off.
Patrik7 years ago
For a moment there I though you were going to make a unicycle our of a motorcycle. Ah well - I can dream, can't I? :-D
Sunbanks Patrik7 years ago
At first I thougt it was going to be a rack you put on your unicycle for a motorcycle.... XD
abbabibble27 years ago
w00t! Thanks Corbin! now i can solve the problem of transporting my unicycle once i get my motorbike!
just wondering, where do you need/use a unicycle, and why take it there on a motorcycle.
Howdy, Where do I use a unicycle? I ride a unicycle anywhere. The KH 24 mountain unicycle is perfect for bombing down any of the steepest and toughest single track around. The KH 20 is perfect for unicycle trials. Unicycling has become much more mainstream, especially in the last few years. Why take it on a motorcycle? Really the question is why do we do anything. But, I have a specific purpose. I ride a motorcycle to cut down on my commute time to work (apple) and I bring my unicycle because I enjoy riding it around lunch in Cupertino (natural trials riding -- ie: hopping on things).
Vertigo6667 years ago
heh, the i-Rack.
Cool! Great Instructable! Thanks Joe
LinuxH4x0r7 years ago
Cool! odd combo, but whatever floats your boat