With rear wheel drive ebikes could drill and file in a rectangle hole in plate steel it would act like a washer but also provide a point to attach a 2nd bolt to use for the hitch mounting point.
So true , both the Burley trailers are Metal both are aluminum as well. I read Metal in the descriptions and took it as "steel" incorrectly when it was actually a aluminum material.
I have one of the bob trailer stays somewhere.... It's from an Ibex I believe. No trailer or extras, so make me an offer.eCue wrote:Thinking about making a bob ? you can buy the front mounting arm and rear wheel stay as replacement
That might work fine, with the right implementation. I think the faceplate that joins the top and bottom mounts would have to be thicker, or maybe just bent into a channel shape to give it some integrity. I would only trust steel headset cups to accept the resulting shear loading. One of the handful of deep cup DH headsets that have been made over the years would be an appropriate pairing.
The load from the bracket would be acting directly on the hardened steel of the top and bottom race cups, so I think any wear would be confined to the much softer mild steel of the bracket.amberwolf wrote: ↑Dec 23, 2017 2:55 amI don't know if it would cause a problem (guess it would depend on the load and the characteristics of the tube and brackets), but I imagine over time the forces deforming (or trying to) the headtube, as it pulls on the top and pushes on the bottom.
Additionally, normally the toptube is in compression and teh downtube in tension. When the headtube is loaded, then (especially on bumps, suspension or not), it'll reverse that to some degree (perhaps completely if the load is high enough), and repeatedly stress the area in ways it wouldn't normally see. I have no idea if that would cause any problems; you'd have to try it to find out.
I'm not looking to carry a huge amount of weight -- maybe 10kg at most -- but my battery and controller are mounted to the back of the seat post so I'd rather not put more load back there.amberwolf wrote: ↑Dec 23, 2017 2:55 amThere are a number of bikes (some DIY, some commercial) with a cargo platform (of varying size and load capacity) that is a part of the frame itself, extending out beyond the headtube over the front wheel.
Chalo has a thread about one such bike he built, if you look thru his posts.
If at all possible I will try and avoid widening the crossbar. I tend to be somewhat knock-kneed and am already capable of banging my knees on itamberwolf wrote: ↑Dec 23, 2017 2:55 amWhat I would recommend for DIY non-weld version is parallel tubes clamped to the toptube (parallel all the way to the seattube) to cantilever the load all the way back to the seattube/post. Iv'e considered this method for an experiment on CrazyBike2 to add a platform on it's front end; haven't done it because now I have the SB Cruiser trike that carries a lot more than the bike already--but I have considered adding it to the trike as well.
Now that's a great idea. I'll have a look see whether I can find one.Chalo wrote: ↑Dec 23, 2017 3:37 amThat might work fine, with the right implementation. I think the faceplate that joins the top and bottom mounts would have to be thicker, or maybe just bent into a channel shape to give it some integrity. I would only trust steel headset cups to accept the resulting shear loading. One of the handful of deep cup DH headsets that have been made over the years would be an appropriate pairing.
It's only intended to fit my current bike which I doubt I'll be changing any time soon.
Agreed. I'm thinking of a couple of extensions coming from the back, behind the bottom cup and twisting to meet the flat sides of my (ovalish) downtube and attach with either screws or pop rivets. The frame is steel, so drilling a couple of small holes won't hurt.
Thanks for the info. I found a FSA PIG in stainless steel (both parts, some/most seem to have alloy upper cups) at a very reasonable price.
I thought about that, but they require drilling a much bigger hole in the frame; and don't you need a special tool to set them?
You might be able to find dealer / retailer who sells similar models that one posted looks DIY to me made up from aluminum tube bicycle wheels and hitch parts. I do like the idea of having a small trailer with a split hitch pole so a length can be added its like two trailers in one.