High limit screw
A limit screw for stopping the derailleur from shifting the chain out past the outermost cog.
Low limit screw
A limit screw for stopping the derailleur from shifting the chain in past the innermost cog.
Lower pulley wheel
The lower pulley wheel in the derailleur cage that pulls back on the lower section of chain to keep it under tension. Also known as tension pulley.
Upper pulley wheel
The upper pulley wheel in the derailleur cage that guides the chain from one cog to the next. Also known as guide pulley.
B-Adjustment
A screw used to adjust the spring tension on the mounting pivot, which affects the distance between the cogs and the guide pulley.
Cable fixing bolt
The mechanism that attaches the inner wire to the derailleur. The inner wire is usually routed through a groove in a plat on the derailleur, and a bolt or nut presses a washer or plate on top of the inner wire to trap and compress it in the groove. The groove in the plate is often hidden by the pressure washer/plate.
Frame mount
The bolt through the topmost part of the derailleur that attaches the derailleur to the derailleur hanger.
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