After Building this Bicycle it was asked that I show some of the workflow used in the making of it. I’ve made a little tutorial on creating on of the parts. I hope it helps someone.
Have fun all.
Ezra
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Thank you very much for posting these images Ezra!
I am most interested in possible uses of Zbrush in non figureative Design, so please keep posting.
thank you for posting this i like your style 
Nice! Looks good. The Resolution in Polys is usually around this. (Res^2)*6.