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  1. #1
    Meatbomb
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    Bash Guard and Chain Length.

    My big ring is pretty much beat to **** and I plan to replace it with a bash guard. Is there any benefit to shortening my chain and if so, how do I determine how much to shorten it?

  2. #2
    Kathleen in AZ
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    Going shorter is advised as you will reduce chain slap. Wrap the chain around the largest rings on the front and rear without putting it thru the deraileur. Pull chain together and note length when chain is tight, then add two chain segments (1 outie + 1 innie) for ideal total length.

  3. #3
    Meatbomb
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    Gracias !

  4. #4
    RHRF!
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    The simple rule I have used for years is the 45 degree rule...

    Put the chain in the big/big gears so your rear derailleur is at a maximum 45 degree angle.
    Attached Thumbnails Attached Thumbnails Bash Guard and Chain Length.-drivetrain.jpg  

    "The secret of joy is the mastery of pain." (Anaïs Nin)

  5. #5
    jddist
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    If shorting the chain, ALWAYS run the chain on big ring back and big ring front then let all the air out of the rear shock and fully compress the rear suspension and check the chain to make sure it isn't too short which can cause really bad expensive things to happen.

  6. #6
    EDR
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    Yes, suspension compression on some bikes will lengthen the chain so do as above. Other than that I pretty much use titusbro's method.

  7. #7
    mtbr member
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    What dirtgirl posted is what the LBS told me to do....but I needed a new chain and let them do it.
    The secret to mountain biking is pretty simple. The slower you go the more likely it is youll crash.
    - Julie Furtado

  8. #8
    Pivotal figure
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    Yeah, DG's method is what Shimano recommends for cutting chains to length. It is good to double check that your suspension doesn't extend the CS length during compression but I can only think of a couple of bikes that have enough growth to be concerned about...
    Desert Sunset Calls/Upward, Pain, Perseverance/Welcome Solitude

  9. #9
    mtbr member
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    Quote Originally Posted by kenbentit View Post
    Yeah, DG's method is what Shimano recommends for cutting chains to length. It is good to double check that your suspension doesn't extend the CS length during compression but I can only think of a couple of bikes that have enough growth to be concerned about...
    kentit, which bikes? thanks
    RAM speed: UP, UP, and away....!

  10. #10
    Pivotal figure
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    Think of the bigger DH rigs with lots of rearward axle travel. Canfield Jedi, Yeti's earlier 303 (not sure if the newer version moves as much), Cove Shocker (don't think it moves quite as much as the others though...). The biggest concern is what length rear der. you're running. I have a super short cage Saint on my Phoenix and it has just enough length to cover the 11-28 cassette I have on the bike. One link too short and I'll snap that thing when in the biggest cog. Mid cage der's usually have enough wrap to accommodate any chain growth from the suspension though.
    Desert Sunset Calls/Upward, Pain, Perseverance/Welcome Solitude

  11. #11
    mtbr member
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    Doing the big/big method and adding two links did not work on my Banshee Rune. Too much chain growth.
    "Don't feel bad. A lot of people have no talent"

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