A very interesting read over at BikeRumour.com. They are going through the process Guru uses for their carbon frames.

Factory Tour – Guru Cycles, Part 2: Building a Carbon Bicycle Frame

Factory Tour – Guru Cycles, Part 2: Building a Carbon Bicycle Frame

Nothing too unexpected but a few cool bits. Using glass beads to fill/stiffen the internal bladder for layup is a neat idea. I'm working on something using low melt alloy instead. It looks like they're using an AirTech fairing compound at the joints (pink). I tried that but didn't like the results and didn't want to have the bake the frame too many times in the process.

One thing I noticed is the fillets don't leave much exposed tube at the joints (HT and BB tubes). I've always thought it best the have the joint wrap adhere to both tubes, carbon to carbon, with a smaller fillet. Would their method not leave just a tiny bond line where the carbon wrap meets the tube at a sharp angle?

Glen
back40 bicycleworks