I chose parts for reliability, durability, and simplicity. Alfine 11 + Gates CenterTrack. 33-1/2 pounds. Built-up by the crew at Pedal Revolution. I love riding this bike: solid, not twitchy, but not sluggish, either. Gear ratios not perfect for my weak legs and SF hills, but I am hoping things will get easier with more cycling. I have a 2 mile commute through the city and park it in my office. I use it for quick errands and trailer my daughter through Golden Gate park on weekends.