Tim MacKinnon has been building radical bicycles for the past several years. These are two that he build last year!! His designs will be on display at the DC Riders Bike Expo at the Arena during this years Rally. This is a free event so be sure to check out his bikes and all the other great stuff planned for that week. Bicycle Build registration forms will be available at the DC Riders booth during the Expo which runs from Sept 2nd - Sept 6th.