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Lost Avid BB7_Mtn Adjuster Knob. Safe to Ride?

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Lost Avid BB7_Mtn Adjuster Knob. Safe to Ride?

Old 11-24-16, 07:45 PM
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SlickCycles
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Lost Avid BB7_Mtn Adjuster Knob. Safe to Ride?

I lost my Avid BB7_Mtn outside Adjuster Knob while transporting it on the bus.

I'm away for vacation and dying to take it out for a ride before the LBS is open.

I did check and the break still works well after a few turns of the flat price which connected to the knob.

Is this still safe to ride for a 30 mile ride tomorrow? Or would it cause damage to the brake and potentially myself?

I'll plan to take it to the LBS after the ride if it's ok.


Added a picture of what it looks like now and the knob that is missing. Its the smaller knob to the right in the photo.
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Last edited by SlickCycles; 11-24-16 at 07:57 PM.
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Old 11-24-16, 08:18 PM
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Should be ok to ride. I can't imagine that plastic bit is holding anything together. It's just there to provide you enough leverage to turn the adjuster shaft.
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Old 11-24-16, 08:23 PM
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I'm not 100% sure about this, but I think the 4 sided spring clip that fits inside the knob is what provides the detent action that holds the adjuster from backing off. If that is so, there is nothing but a bit of friction preventing the adjustment from backing off.
It would be easy enough to verify this. turn the flat end of the shaft with a pair of pliers. If you don't feel the clicks, well then, I was right.

Last edited by Dan Burkhart; 11-24-16 at 08:27 PM.
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Old 11-24-16, 08:38 PM
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Yeah turned it with my fingers and didn't hear any clicks
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Old 11-24-16, 08:57 PM
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You can kind of hack it by adjusting the missing side all the way out, then re-adjusting the caliper as if it were a single adjustable piston brake. It should suffice until you get a replacement cover for the brake.
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Old 11-24-16, 09:07 PM
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New to disc breaks so not too sure how to do that. Brakes still work well, would they slip out of position?
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Old 11-24-16, 09:20 PM
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You can follow the instructions at https://www.parktool.com/blog/repair-help/avid-mechanical-disc-adjustment#article-section-2

At the section for caliper alignment, disregard the direction to adjust the outer adjuster (step 5), and instead insert a business card between the outer pad and the rotor. Adjust the test as described--you should then be able to complete the procedure as outlined, and use the barrel adjuster to set clearance for the outer pad.
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Old 11-25-16, 12:12 AM
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Originally Posted by SlickCycles View Post
Yeah turned it with my fingers and didn't hear any clicks
You won't hear any clicks. The clicks are made by the plastic bits interacting with the detents on the outside of the caliper body. They will work just fine but they won't 'click'.

You can get replacement knobs for just about anywhere. Your local bike shop should be able to order them from Quality Bicycle Products.
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