I got the rack installed for the kid's seat on my commuter bike. So I can take him the 2 miles to daycare, leave him and the seat for Mom to pick up in the afternoon; then ride the 4 miles to work. We now have the ability to attach the seat to the 3-speed, the tandem, my wife's bike, and my commuter, and we now have two seats. But there are three kids! There will also probably be a trailer upgrade. We'll figure it out.