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Old 06-18-11, 08:28 AM
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The main thing to look for in a rear DR is "capacity". Most all have the ability to handle any contemporary gear cluster as far as side-to-side capacity goes.
So the thing to think about is the ability to handle larger cogs. (Lower gears)
"Mountain bike" DRs have long "cages", the part that holds the two idler sprockets. This to allow the use of the typical low gears on MTB cassettes.
"Road" DRs have typically shorter cages for the typically smaller and "closer" gear clusters found on roadsters.
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