I'm from Make:Philly, and we are looking for an awesome speaker for march. Your bikes are sweet, and the built-in transmissions are amazing.  I'd like to see if an engineer or designer would be interested in coming to Make:Philly as a presenter in March. It's a 1 hour on a Sunday commitment.   It's a bunch of DIYers/geeks/nerds/hackers/designers and the interest would be in the cool design, and how things got intended and created.