Step 2: Bend the Curtain Rods (or metal strips from filing cabinet... see materials update).

You are going to take your curtain rod and bend it into a U at the appropriate height. The first leg becomes an L, with the second leg making it a U.

First, you need to have a basic idea of how long the supports need to be.

Find the hole in the frame near the hub of the rear wheel. Put the end of the curtain rod over the hole and hold the rod vertically. About an inch above the tire, mark a line. This is the appropriate height. Do the same thing on the other side, using the other end of the curtain rod. Where you marked the lines is where you will bend the rods.

The space between the marks is where the deck will attach and rest. It should be nearly four inches to offer support. If it is much longer you will need to trim the length of your rod. Measure four inches from the first mark: this is your new bend line. The amount the new line moved from the old is what you need to cut from the end of the rod.

Now, take your rod to the vice and clamp it in at the mark. Pull the rod towards you until you have a right angle. Put it in again at the second mark and bend it there, too. You should have a U.

Things to Note:

Most curtain rods have that little bend on the end. If you need that length (I did) you need to bend it straight. Do it as you can always cut it off.

I used a large table vice for bending, but you could probably use the edge of a table. Some of the folds might tear the rod. As rods are pretty much disposable, you can just get a new rod and start again.

I also flattened out the ends and the cross piece where the deck board will sit. It makes things flush when bolted down.

Update: If you are using a metal strip from the filing cabinet, note that they are shorter than a curtain rod.  You'll need one for each side.  Bend them into an L and overlap them as you attach them to the underside of the board.  Very strong.
Cool! YO ucould easily attach a basket or the likes to accommodate luggage :D
omg i see u on every instructables i go to scarry
I have always been a fan of the milk crate on the back of a bike or moped; very functional in every way. I thought an old wire in box would be kind of cool-retro. I have a wire basket on the front of my own bicycle and it is indispensable. My only concern is it getting too top heavy (or just plain heavy) and it wracking. This is more paranoia than experience, and after having cautioned people about it being for a child I have been impressed by its durability as my son bangs the heck out of it. Go figure. If you use some flat steel (I see it a lot behind supermarkets for some reason) but keep the rest the same it might be indestructible.
 i use to do that then i got saddle bags for mine
Sweet. What about pvc pipe? I could melt it if I need to, but mostly I think it is sturdy/flexible/durable enough?
With PVC pipe you can use PVC cement and corner pieces instead of bending, which is a big plus to those without a lot of tools. I don't think you will need to melt or flatten anything; just buy longer bolts and don't drill too near the end (so it does not crack) or cap the ends for added strength. Can you paint PVC (if you wanted to)? With copper piping, if you know how to sweat pipe, you could do some really solid stuff, too (and I think copper piping looks kind of steam-punk cool). In the "materials" step I mention having a vague list in part because this--and the entire instructables site--is about innovation and can-do to your purpose. PVC would really work, I think. My personal hang-up is that I want it to look like a more traditional bike rack. If it were for me, I might use any host of things, but my son is seven and there is that balance between being unique or being an oddball when he rides it to school. PVC might put him in the latter. Again, this is my hang up, and my son is blissfully unaware of such things. As a parent, I avoid brands and store bought, but I also remember as a child liking to retreat into anonymity when needed. So, while he rides a second hand bike that I painted green with a rack made of discarded curtain rods, I am still aiming for normalcy and not attracting attention. We wear a lot of khaki, if that gives you insight into our motivations. Use the materials you have on hand. I can think of a dozen better materials, but curtain rods was sitting in front of me so that is what I used. Waste not, want not and all that.....
I could use cardboard. I have a lot of that on hand. But yes... PVC is paintable and would be a good candidate.
lol and i thought i was the only one to think of things like this i made one of these on a bike i borrowed so i could take my cooler with me but i made mine of all wood and some shoe strings lol =)
Wow thanks i ride a 20" bmx bike and the Seat is slanted so i cant get a good Rack on it and i needed to build one so this is perfect rated 5/5

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Bio: I like to explore with my hands, but I trouble choosing one area of focus. I have completely renovated my house, but nothing I do ... More »
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