Part no. T-2212 | This replacement knob is specifically for any gray trainer manufactured prior to 2007 with a serial number smaller than 50000. This new tension knob features our newer design which is stronger and more durable. We suggest replacing the old knob with our new design.

(Click on this link if you have a GREEN TRAINER with a V-shaped frame, 2007 OR NEWER, and need to replace the L-bolt and tension knob)