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  1. #1
    Velophile Epicus07's Avatar
    Join Date
    Mar 2009
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    Seattle, WA
    My Bikes
    Specialized Roubaix, Specialzed Allez Sport, Guerciotti SLX
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    Shimano XT rear derailleur w/ RSX 7 Speed STI?

    Its a new derailleur. I think its supposed to be 8/9 speed compatible. Would it shift ok with 7 speed drive train? or is the difference in chain width too great?
    2009 Specialized Roubaix - Long Distance Bike
    2002 Rodriguez Adventure - Touring Bike
    1996 Guerciotti PRX - Italian Steel Joy ride
    1996 Litespeed Natchez - Titanium Speed Demon (pics to come)

  2. #2
    Senior Member DieselDan's Avatar
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    Mar 2003
    Location
    Beaufort, South Carolina, USA and surrounding islands.
    My Bikes
    Cannondale R500, Motobecane Messenger
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    It will work. Pull ratio is the same for all Shimano rear derailleurs except for 8-speed Dura-Ace. I use a 10-speed rated 105 with a 7-speed RSX shifter that works flawlessly.
    Bikes use brakes to stop.

    If your bike has breaks, don't ride it.

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