Are trainer resistance units replaceable?

If you have a Classic Series trainer with a manufacturing date from 2005 or later (3 3/4" inner flange spacing), compatible replacement resistance units can be found here.  If the unit was manufactured before 2005 (2 1/2" inner flange spacing) or if you have a Pro Series trainer, please reach out to Customer Support at 1-800-783-7257 or support@saris.com.  Options or alternatives for these models exist, but are limited.