I worked in bike shops for a few years (when I was in college) and I've continued to work on bikes through the centuries since then, so I've done everything but weld and braze. I build my own wheels.

My big challenge is to cycle to work most days. I only do it occasionally. It's 11.5 miles and pretty hilly. Inertia and bad time management are the primary reasons I don't do it more often.

Oh, and I hope we get some snow or ice on the ground, because I'd like to try riding on them with knobby tires. We generally don't get that much snow here. When we get it, it's usually plowed away quickly.