Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!

Lower Crown Race for 1 1/8

by quezz38, published

Lower Crown Race for 1 1/8 by quezz38 Jan 29, 2012
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The frame that I recently purchased came with most of a headset, but no lower race. I drew this up in Rhino then printed it so I could get my bike together. I'll test it when I put some wheels on this thing.

follow me at www.ThePrototypicalPolymath.com

This item is not meant for mass consumption yet, it is probably very dangerous.

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Did you ever get this thing tested?

Surprisingly enough, I've actually got several hundred miles on this thing now. I thought it was going to fall apart, but it has worked well.

you might want to go to a bike shop and get a real metal one. that part has to take an enormous amount of stress. you will end up ruining the headset and possibly the fork if you ride with a plastic bottom race. I cant imagine that part lasting more than a few hours

This is more a test of fit than anything, although I am planning a stress test. I want to see the capabilities of prints in high stress applications. I don't imagine any of it is going to work well, I'm just curious and reckless. Thanks for your concern.

watch my blog for updates on my injuries.

Honestly if it's printed solid, I don't see any reason why this design wouldn't work for a long time. There are high forces but they're distributed over the entire surface, and plastic is plenty strong in pure compression like this.

Even if it failed completely, it's not like the fork is going to break off the bike. In the case of a complete failure where the race completely disintegrated, the bike would ride like it had a really loose headset, and that's about it. Hopefully you'd notice that and stop riding before it got to that point. So predictions of doom and gloom and armageddon may be a bit off base.

Yes, actually it still works fine after 4 years of trail riding and crashing. I'll try to remember to take a picture of it next time I have it apart for maintenance.

That's fantastic!

I'm making one for 1.5" headsets (tapered fork on my bike) and once I get the dimensions worked out I'll post it and credit this as a source.

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Yes, actually it still works fine after 4 years of trail riding and crashing. I'll try to remember to take a picture of it next time I have it apart for maintenance.