![]() Compare this line to outer derailleur cage plate. Consider the chain as representing a straight line. ![]() Sight chain from directly above chainrings.Shift chain to outermost chainring and outermost rear sprocket.Notice rear end of cage is inward, toward mid bike plane. Derailleur B is rotated too far clockwise. ![]() Image C below shows adequate alignment.ĭerailleur A is rotated too far counter-clockwise. Generally, the outer cage of the front derailleur should be aligned to the chain. If the derailleur mount is a clamp type, its rotation can be changed. ![]() If the derailleur cage is rotated too far from this position, it will shift poorly. The front derailleur cage should be approximately parallel to the chain. Repeat this process until cage plate height is 1-2mm above outer chainring. Move outer cage plate over outer chainring, and check height again. Loosen derailleur clamp bolt, change derailleur height, and return cage to same rotation relative to chainring. Front derailleur clamps typically leave a mark on the frame, which is useful as a reference when changing height.Note angle of outer cage plate relative to chainring. To lower cage, release inner wire tension completely by shifting to innermost chainring.It should just fit between the teeth and plate. Using a penny or a dime as a feeler gauge, fit it between the chainring teeth and the cage plate. The gap between the teeth of the outer chainring and lower edge of the outer cage plate should be 1-2mm, about the thickness of a penny.It is then necessary to relax the cable to loosen the mounting bolt and raise or lower the height as needed. Note height and direction of change needed. Use care to not shift the derailleur cage past this point. Simply grab the exposed front derailleur inner wire until outer cage plate is directly over outer chainring teeth. The outer cage plate must be positioned over the largest chainring when viewing height. Inspect height alignment of front derailleur.This bracket will allow limited height and rotational settings. Additionally, some bikes have a bracket commonly referred to as a “braze-on” for front derailleur mounting. These models mount on a plate and both height and rotation settings are preset. Some front derailleur models do not have height or rotation adjustments. If the derailleur is too low, it may scrape against the chainrings or jam the chain when shifting. If the derailleur cage is too far above the large chainring, it is more likely to shift poorly. This is about 10 pounds of effort hold a wrench 3 inches from the bolt.īefore checking limit screw adjustments, check the derailleur positioning. When tightening this pinch bolt, secure to approximately 30-40 inch-pounds. If you have loosen the inner wire pinch bolt, lubricate those threads as well. The cable inner wires should also be lubricated. It is generally a good idea to lubricate the pivot point of the front derailleur with a light lubricant. The basic adjustments for the front derailleur are the height, rotation, limit screws and inner wire tension (index setting). A properly adjusted front derailleur should shift the chain between the front chainrings but will not throw the chain off the rings. A spring in the derailleur returns the cage to the other direction when the inner wire is relaxed. The cage surrounding the chain is pulled in one direction by the inner wire. The front derailleur simply shoves the chain off one front chain ring and onto another ring. Cable end caps and housing end caps as needed.Derailleur cable inner wire and housing as needed.Screwdriver (#2 Phillips or straight blade).Repair Stand - holds bike secure for easy work.
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