Unique. Imaginative. Creative. Words that help describe Cragear's Bike Tire Frames.  Donated tires come from bike shops (post-consumer), manufacturers (pre-consumer) and individuals.  Know that the discarded items were destined to go to the landfill, but are now instead wonderful frames.  4 types of Standard Frames are available: Glossy, Tapered Tread, Mat Tread and Ultra Knobby.