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L-Bolt and Tension Knob - Pre 2007

Small Part C and E

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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.

IMPORTANT: when replacing an old L-bolt with this updated design, you’ll also need a new spring to fit the new bolt diameter. This L-bolt is machine down at one end, but has a larger thread diameter and spring diameter. (Click here to order a new spring).

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