Useful Links

Schwinn 420 Elliptical Trainer Official Site
You can read many details and information about Schwinn 420 Elliptical Trainer in their manufacturer site. Details like complete features, technical specification and etc.
http://www.schwinnfitness.com/schwinn_fitness_us/homepage.jsp

Schwinn 420 Elliptical Trainer on wikipedia
In this wikipedia, you can browse the complete list of Elliptical Trainer products including Schwinn 420 Elliptical Trainer.
http://en.wikipedia.org/wiki/Schwinn_Bicycle_Company