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  1. #1
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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?
    Thx

  2. #2
    Senior Member Retro Grouch's Avatar
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    Feb 2004
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    St Peters, Missouri
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    Rans Enduro Sport, Hase Kettweisel Tandem, Merin Bear Valley beater bike
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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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