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Old 04-30-07, 12:33 PM
  #12  
Bike Lover
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Location: S.E. Michigan
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Bikes: C-dale- moutain, Pedal Force RS- Campy Record, Quiring Ti XTR, Red line Monocog, S E F@r

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Really, that's its job. It is trying to keep tension on the cable so the chain doesn't fall off. In the pics you posted, you can see in the middle one that the "arm" of the D is "coiled" but creating tension. As you go to physically larger gears, the arm extends but keeps the chain in tension.

As for if it happens on my bikes, very rarely as I try not to go into the "big-big" ring and gear at all. This is why you have additional front rings. If you went to your middle ring, you'd find a gear that would work in whatever situation you thought you needed the big-big combo.
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