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E-Type Front Derailer
A front derailer designed to be secured to the bicycle by the right-side bottom bracket mounting ring or cup, instead of clamping to the seat tube.
E-type derailers are commonly used on bicycles that have non-round seat tubes that are incompatible with standard clamp-type front derailers. An E-type derailer also may be used on a small-wheel bicycle where the chain slants down toward the rear hub, or on a bicycle with rear suspension that would get in the way of other derailers. E-type derailers do not provide any adjustment other than the high and low limit stops, and rotation around the bottom bracket.
It is hard to install an E-type derailer wrong, but on the other hand, it must be used only with the specific sizes of chainrings for which it was designed, and with a bottom bracket cup or mounting ring that has a shoulder to retain the derailer.
See also my Article on Front Derailers
