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Chain Ring Keeps Popping Off When Shifting

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Chain Ring Keeps Popping Off When Shifting

Old 06-28-08, 07:49 PM
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DomCast07
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Chain Ring Keeps Popping Off When Shifting

Hey everyone. I'm new to road cycling and I have an old Peugeot Road Bike.

There is a black circular protective cover that snaps over my Chain Ring (whatever the chain goes on) and when I shift to my highest gear (the-all-the-way-down position on the left-hand side of my lever vertical shifters), the chain comes off of the chain guide and the black plastic piece (on the outside of the chain ring) pops off, usually resulting with it getting stuck between my pedal and my foot. Any help on this situation? And by the way, I do make sure that the black plastic piece (circular with 6 tabs to put into the chain ring) is secured to the chain ring when i begin riding. Thank you.

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Old 06-28-08, 07:50 PM
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And i am really sorry for my lack of knowledge dealing with bike mechanics. I am a newcomer to the sport and lifestyle. Thank you.
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Old 06-28-08, 08:18 PM
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Al1943
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You probably need to adjust the front derailleur. There are derailleur limit screws that keep the derailleur from traveling too far throwing the chain off.
Before you adjust anything read the derailleur adjusting instructions found at http://www.parktool.com.

Al
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Old 06-28-08, 11:46 PM
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Bill Kapaun
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Follow the link above.
It sounds like the High limit screw has to be turned in some.
Keep track of where you started in case you turn the wrong screw.
IF you turn the Low limit screw, it just won't want to shift to the small ring, so no damage.
Start with the front shifted to the small ring. In that position, there should be minimal resistance to turning the H screw. IF it turns hard, it's probably the wrong one.
Start with a 1/2 turn and then smaller increments if needed.
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