Adjusting Shimano 105 Rear Derailer
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  1. #1
    RoadBikeReview Member
    Reputation: TallCoolOne's Avatar
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    Jan 2010

    Adjusting Shimano 105 Rear Derailer

    I have been trying to learn how to adjust my rear derailer on my own through just enough internet reading and trial and error to be dangerous. I have everything running pretty smoothly shifting easily (maybe not bike shop tune up quality but pretty close I think). My only issue is that I get a little grinding when I am in the big chain ring and largest rear cog. I will never be in that gear combo so it a big deal? What can I do to get this gear combo to run smooth?
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  2. #2
    Rub it............
    Reputation: frdfandc's Avatar
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    Nov 2007
    Big gear up front and big gear in the back is considered cross chaining. Its a no-no. Most avoid this combo.
    You can't fix stupid.

    Quote Originally Posted by JoeDaddio

    I kind of wish it were legal to staple people in the face.

  3. #3
    RoadBikeReview Member
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    Dec 2009
    When the big-big combo is used it causes the chain to bend at such a angle that it is rubbing against the teeth of the cogsand chainring instead of gliding over the teeth. This rubbing grinds and helps to wear out the chain and cog/chainring faster than if the chain and gear selection was in a less stressful conbonation. The small/small gear combo is also frowned on (and usually noisier).

  4. #4
    Adventure Seeker
    Reputation: Peanya's Avatar
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    Jun 2008
    Go to and search gear ratios. You'll find out why there isn't any good reason to cross chain.
    I have a single track mind

  5. #5
    RoadBikeReview Member
    Reputation: Ventruck's Avatar
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    Mar 2009
    Non-rubbing cross chaining is possible with the combination of proper RD and FD settings (noting that I have a 105 rear derailleur as well to get this working), but still ill-advised. Just make sure with both rings you can acesses about 6-7 sequential gears perfectly, one-by-one, both ways.

    A slight learning tidbit: Just because you paid for a 10 speed cassette, doesn't mean you're expected to make use all of 10 cassette gears per chainring. A 10 speed cassette does indeed have more range (gear selection) than a 9 speed cassette, but its true advantage lies within having closer ratios to reduce the differences when shifting through the rear gears - which in turn results in smoother transistions for changes in gradient (angle relative to the horizontal/flat). One could have the legs to muscle/spin a given gear if lacking the close-ness of such ratios, but it's not to say they're unable to benefit from then converting to a greater speed cassette.

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