Wanted: Bmx wheels for trailer build.

Hello,

I am building a bike trailer from scratch and need two 20inch front wheels.

Ideally they need to be free or nice and cheap so if you have any old wheels that i could put to use let me know.

Many thanks
R

I'd be interested to follow your build, any chance you could do a "current projects" thread or post link to plans if they online already etc... just shelled £70 notes on a trailer and reckon building would be cheaper...

Id give you some but I am not local.

Can I ask what design your are going with? I would've thought that you would need wheelchair hubs.

maybe try decathalon for cheap 20''?

I too am interested in the design planned...

Just building one of these myself, chucking parts here and there no major plans, I would be also interested in seeing this though!

So far i have only made the coupling device which will provide a quick release between the frame and the trailer and allow for free movement on every axis. I made this from a heavy duty low level castor wheel with which I welded a snap adaptor from an air compressor providing a strong but quick releasable connection. (I got this idea from a youtube video i saw)

I have done a few sketches for the structure of the trailer and have amalgamated the best elements i have seen from various designs. My main inspiration has been the "flatsy" from http://bikecart.pedalpeople.com:

I'm planning to make mine out of conduit like the flatsy. I am designing mine to take a good 80kg so it can carry a human but i don't know if this is a bit ambitious at this point.

If anybody has got any experience or advice, let me know.

To pull a really heavy load I think the designs that clamp to both sides of the bike are better. Especially if you are clamping to a skinny road bike.

You can make a seperate section to go in between the actual trailer and the stays. A bit like this:

So you still get the hinge/pivot. Because the stresses will be symettrically balanced, you wont have to overbuild/reinforce the connecting arm as much. There will also be less concern at the connection point to bike, which may fail pulling something really big or with braking.

Its undoubtedly a better design for distances, however I am not shore that the one wheeled trailer is a better load bearing design though.
By having two wheels and carefully loading the weight directly over the trailer axles a large amount of stress on the pulling arm should be eliminated.
But the one wheeled design acts like a bridge transferring all of the load between the bicycle and trailer wheel, so the actual structure of the trailer will be bearing more weight.
Also because i am going for two wheeled design i need a single arm because the twin arm does not accommodate for the twist motion that a two wheeled trailer will have.

This is my first trailer but i don't think it will be my last, so i am learning as i go along. I am not an engineer i just like making things so i might be very wrong with my ideas, let me know.

I have a front wheel you can have for free. It needs a new axle, current one is bent, and it could do with a true, but it's OK other than that.

So basically I am offering you a pretty shit wheel but the offer is there.

frustratingly realised I have 8 bmx wheels just for puncture repair lessons. that's 4-8 trailers worth that are untouchable for now... i'll see if I can get more from same source, at what price...

Its undoubtedly a better design for distances, however I am not shore that the one wheeled trailer is a better load bearing design though.

Also because i am going for two wheeled design i need a single arm because the twin arm does not accommodate for the twist motion that a two wheeled trailer will have.

You have totally misunderstoof what I was trying to say.

I meant a two wheel trailer, pretty much the same as your picture. But joined with a two arm connection to the bike. The "pivot" or "hinge" part will be the same as with the bob. It bends where the twin connecting arm joins the trailer part.

hay :) iv'e got some u can have..

hay :) iv'e got some u can have..

Great stuff, cheers, ill send you a PM.

You have totally misunderstoof what I was trying to say.

I meant a two wheel trailer, pretty much the same as your picture. But joined with a two arm connection to the bike. The "pivot" or "hinge" part will be the same as with the bob. It bends where the twin connecting arm joins the trailer part.

Yes the bob design with the two arms allows for up/down plus left/right movement, this is all you need with one wheel because it can lean with you around corners.

A two wheeled trailer is going to stay parallel to the ground while you lean so it will have to be able to twist where it connects to the bike.

I just cant think of a design which uses two arms like the bob trailer but then allows for the twisting motion while remaining nice and strong and not floppy.

that trailer is awesome, really nice low centre of gravity. Are those all chris king headsets?
The whole bike is just ridiculous, someone has let there crazy cycle desires loose with no compromise in design or budget.