Lots-o-clearance.........

What kind of flat steel is it? What are you using inbetween the "U" piece and the bb? any pix of the yoke/cs all put together?

What's the crank/chainring clearance on that thing like?

How does this affect the stiffness of the rear end?

hugh

Surpisingly little.......but there can be, depending how you build it. We have only used 2 strips brazed together to not make it too stiff........The 36'r feels like it has a shock in the back but I think that may be a combination of variables.

That looks pretty cool.
Are you saying that there are two "strips" used?
Looks like there are two at the bend (one being shorter at the bend). and then just the long one for the full length.
Am I right?

another yoke question: why are you using a pair of plates brazed together rather than a single thicker piece?

thanks! you guys put together some fun stuff!

why have a piece of bread when you can have a sandwich?

cool looking idea

Thanks.........we opted to go with multiple layers to try different options related to stiffness. So far two seem to be just right for a 170 pound rider. :thumbsup:

Just two .06 strips brazed together
why not just order the correct thickness, now that you know the baseline, and then add to that?
cool idea btw

Yeah, I think that would work......but when we put it all together in the hydraulic press with the wooden mandrel, things start to get kind of scary.......I think if our set-up had to work any harder with thicker strips, things may go ka-boing and metal & wood would go flying in an uncontrolled fashion........at least that's how I see it going in our lo-tech shack in the woods.

haha! right on! the ability to try different thicknesses makes sense. what type of strip did you use? did you opt for the 4130, cro-mo, mild or...? thanks for the quick reply!

4130 steel strips...........good stuff and not expensive. :thumbsup:
http://www.aircraftspruce.com/catalog/mepages/4130strips.php

Smokebikes said:

Depends how tight you want it.........This next bike will have tons. For one of the bikes we had the big ring a little too close (not rubbing) to the CS due to a request for a short CS length.......the current project will have a CS of about 17.5"

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You guys are building geared bikes now? I thought you only did fixies.

Manicmtbr said:

You guys are building geared bikes now? I thought you only did fixies.

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I'll build anything that suites me :thumbsup: ..........fixies, trikes, sidecar-bikes, geared....whatever. Yeah, I know that we seem like fixie zealots but truth be told, it's all good and diversity is the spice of life. My first geared building experience was the 36'r project which turned out to be a little too freakish..........but should be just the ticket for Halloween.