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  1. #1
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    RD & Front Cranks

    Is a shimano Ultegra 6600 RD long cage compatible with a double front crank or do I need the short cage RD?

  2. #2
    Low car diet JiveTurkey's Avatar
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    Medium/long cage will work just as well. The only real advantage of a road short cage (SS) over road medium/long cage (GS) is lower weight.

  3. #3
    slow as I ever was Ex Pres's Avatar
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    You didn't mention what range you're running in the rear, but a long cage will work in any case.
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  4. #4
    Low car diet JiveTurkey's Avatar
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    Good point Bob Barker. If you'll be using a cassette with larger than 27-teeth cogs, you'll be best off with a mountain bike rear derailleur. Either the MTB short/medium (GS) or MTB long cage (SGS).

    Official Shimano party line for rear deraillaurs:

    Road SS ("short" cage)............Double chainring....27T or smaller cassette
    Road GS ("medium"/"long").....Triple chainring.......27T or smaller cassette
    MTB GS ("short"/"medium").....Double chainring.....28T or larger cassette
    MTB SGS ("long" cage)............Triple chainring........28T or larger cassette

    Models are "upwardly" compatible (that is, a given model will also work with the setups listed above it).

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