Ask a Mechanic Screen Shot 2016-08-03 at 11.44.35 AM

Published on August 3rd, 2016 | by Greg O'Keeffe

Ask a Mechanic | Emergency Derailleur Cable Fix

Kasey wants to know, “While out on a ride the other day, my rear derailleur cable snapped and I didn’t have another. Is there a quick roadside fix that I can use to get me home without having to pedal in my hardest gear? 

We’ve all been there, and yes, I do have a tip for you should this happen again.

The first thing you’ll want to do is release all the shifts from the rear derailleur. Be sure to pull on the cable as you do this so the cable doesn’t bind up inside of the shifter and lock the shifting mechanism in place.

Once all the shifts are released, go ahead and remove the cable from the shifter. After the cable is removed, remove the other broken part of the cable from the rear derailleur. At this point, you will also need to remove the last section of housing from the derailleur or cable stop. Once that section of cable and housing is removed, grab the section of cable with the head on and pass it through the barrel adjuster or housing stop on the rear derailleur until the head of the cable stops.

Next, you’ll want to select a gear that you think will be able to get you home comfortably, probably somewhere near the middle of the cassette. Once you are in the gear that you want, simply anchor the cable onto the derailleur with the cable fixing bolt.  Once it’s in the gear of choice, you can use the barrel adjuster to fine tune the derailleur in that gear to eliminate noise and keep the chain from wanting to skip around between gears. Loop whatever is left of the cable somewhere out of the way in order to keep it from getting wound up in the wheel or rear derailleur and you’re good to go.

If the cable breaks off at the head and there isn’t enough length to put through the derailleur and anchor in place, you can either tie a knot in the cable to accomplish the same thing, or use the limit screws on your rear derailleur in order to get your bike into a more manageable gear.

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About the Author

After a couple of years as a team mechanic for Highroad Sports, Greg joined the Art's Cyclery crew as our lead mechanic. The only thing Greg loves more than cycling is watching the San Francisco Giants play baseball.



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