Can I upgrade the resistance unit on my current trainer? Lauren H August 21, 2019 19:25 Follow If you have a Classic series trainer manufactured in 2005 or later then you can buy a new resistance unit here. If your unit was made before 2005, or if you have a Pro series trainer, please contact our customer support team. Related articles How tight should the resistance unit be up against my rear bicycle tire? How do I set up my wheel-on trainer? Do I really need to use the included trainer skewer? I have my trainer and bike set up, now what? How do I fix a solid red light on my trainer? Comments 0 comments Article is closed for comments.