Dyno is a particular make of a mountain bike. They're said to be pretty good for tricks and jumping but are not extremely fast bikes. Dyno sold out to GT and are now believed to be owned by Pacific Bike Company who sells to large retailer's like Kmart and Dick's Sporting Goods. Regular mountain bikes can be be upgraded to dyno's by using a dyno kit. For more information on Dyno bikes visit:
. http://www.ask.com/ans?q=%09dyno+bikes&o=0&l=dir&qsrc=2872#anchl_3 .