Great News!!! You can change old 27 inch bikes and convert the wheels to the modern but just slightly smaller 700c wheels. Its' easy and we prepared a section which has tires, rims and wheels that resemble the types of tires rims and wheels the old 27 inch bikes would have. For less than $200 a person could get new tires and wheels and whoooosh, be on their way. Our conversion kits include wheels and tires and the hardest thing about the whole process is opening the box. 27" and 700c wheels ARE interchangeable. The tires are not but the wheels are. Anything 27" is getting harder and harder to find. Going to a 700c now allow for a lot of choices in tires, colors and types. http://www.everybicycletire.com/Shopping/s-377-27-conversion.aspx