This replacement knob is specifically for any trainer manufactured after 2007 and with a serial number of 50000 and larger. This new tension knob features our newer design which is stronger, more durable and hassle-free. We suggest replacing the old knob with our new design.
If you have a GRAY TRAINER, MANUFACTURED BEFORE 2007, and need to replace the L-bolt and tension knob, go to this part page »
