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  1. #1
    Join Date
    Mar 2008
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    Rear derailleur pulley 10T vs 11T

    I have to replace my rear derailleur on my old Trek 1200 road bike. The wheel has an 8 speed cassette. The old derailleur is a Shimano RSX Integrated 8515 and has 10T pulleys. From other posts I have determined that I don't have to find an "8 speed" derailleur. For example, a Simano RD-4500 (9 speed) should work, but I see that 10T pulleys have gone by the wayside. The RD-4500 (and most others) have 11T pulleys. Will an 11T pulley work? I would think that the number of pulley teath would have to be matched with the chain pitch and I would have to find a derailleur with 10T pulleys? But maybe not? Can I use 11T pulleys?

  2. #2
    Senior Member Retro Grouch's Avatar
    Join Date
    Feb 2004
    St Peters, Missouri
    My Bikes
    Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Hase Kettweisel Tandem (redundent recumbent), Merin Bear Valley (The gopher).
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    Virtually all bicycle chains are the same 1/2 inch pitch. The 9 and 10 speed chains are a little narrower.

    The derailleur with the 11t pulley will work fine.

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