light and strong was the idea. i know a BMX / Mountain bike manfuracturing company here in Hamilton (New Zealand) that design and make bike frames out of a kevlar type material. its not as likely to delaminate like carbonfiber does when it takes a nock. but almost as light and just as strong. They also make aluminium bike frames, so they have all the knowledge i need
I could possibly design a trial and and flat frame.
Just from what I’ve seen on UDC and other sites all the street specific frames have square crowns. Do street riders really use the flat crown? From what I’ve seen the flat crowns are only
used in flat
I remember reading a while back about round crown frames being inherently stronger/stiffer. I don’t know if that’s true, but if it is a round crown design would make the most sense.
Why not design one frame with a round crown, but have a flat crown piece that slides down over the seat tube, and secures with a collar like a seatpost clamp. This would be a good multipurpose design that would satisfy a great variety of people.
Ripple in the tubing to increase weld contact area. Stronger, and looks good.
Flat crowns demand more welding and aggressive angles for the tubes, so it’s a bit of a compromise.
I wouldn’t recommend a carbon frame if you plan to mass-release it without getting problems in the long run. I just wouldn’t trust a plasticky-feeling piece of tube with carbon weaves ‘bonded’ (i.e. glued in with some strong liquid) into aluminium collars. It would just make me personally feel my frame is a disposable glued together job. Getting high quality carbon tubes is very expensive, and there are many different types, some with glass cores and then some also have thin aluminium tubes pressured into them to help increase strength/stiffness.
That being said, going for a chromoly frame as a first prototype to just get the basic shape is fine.
for street i use a round crown, the frame that impact makes is great because its light and since its wide you can actually get your feet on there pretty good if you ever wanted to do tricks that require such things. Its still not the same as having a flat crown but much better than the older nimbus frames. Also i like round crown frames because i dont bust my knees and legs on them near as bad
Soooo maybe think about making the frame wide at the top if your going to do a round crown design and then taper it down to a smaller size at the bottom.
thats just my 2 cents
For trial, street and flatland…
something like the triton disign
Or Like the carbon concept frame from koxx If you take a good look at the round crown, you see on the crown little things to make it stronger I think, but it makes also a little platfrom, so maby If you do something like that with bigger ‘things’ for a bigger platform it can be nice… idk (if you don’t understand, I made a little thing in paint ^^) It is just an idea…
and maby combine a seatclamp and frame
This design is good for trial and street: no pain for knees and it is ok for flatland
if you scroll down there are some concept web frame designs from koxx one…
i think the red 20" street one would be an awesome idea. sorta like tims design or somiliar to the triton spong. slanted but not completely round, so its good from traisl, street AND FLAT. Also maybe an integrated seat clamp like tim said and some quick release bearing holders
Your image gave me an idea. Would it be possible to design a round / angled crown frame that has removable blocks / steps that could transform it into a square crown?
I’m thinking the round section of the frame would be a little thicker and have a couple keyholes on each side. The removable blocks would have pegs that would slot into those holes. I don’t know how you’d get the blocks to stay in place (maybe a leaf spring inside the frame?) but that might not be an issue if the holes are keyed well enough.