Longer chain for 8" swing arm?
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Thread: Longer chain for 8" swing arm?

  1. #1
    Member TWBUSHMAN's Avatar
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    Longer chain for 8" swing arm?

    I bought a 8" extended swingarm from Webike, and the chain it comes with is about 2-3" too short!!! Can anyone point me in the right direction of a long o-ring chain for an extended swingarm? Do I need to just buy two chains and merge them? Also will I need a difference front or rear sprocket with the longer swing arm?
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  2. #2
    Member TWBUSHMAN's Avatar
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    Before and after of the longer swingarm.
    Attached Images Attached Images

  3. #3
    Senior Member TW-Brian's Avatar
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    My son put one of those swingarms on his bike but he received the correct length chain. Since it appears that you are running a stock size rear sprocket I would suggest contacting Webike for the proper length chain. If that doesn't work, determine how many links the short chain has and start shopping for one that has the additional length that you need. If you want to be able to ride your bike now you could add a length of chain from your original chain, but it wouldn't match the pretty gold one that probably came with your kit.

    There is no need to change your sprockets due to the longer swingarm, unless they are already worn and need to be replaced.

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  5. #4
    Senior Member Rockit's Avatar
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    Are there swing arms for TWs that extend less than 8".
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  6. #5
    Member TWBUSHMAN's Avatar
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    I mean an ADDITIONAL 8"

  7. #6
    Senior Member Fred's Avatar
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    A 428 chain’s inner plus outer link halves nominally equals 1.0 inches.
    A swing arm extended 8 inches will need 16 inches of additional chain.
    The math gets pretty complicated here but I believe this calculates out to 16 additional links needed.

    Now if one is changing sprockets the chain only sees ~1/2 the number of teeth added or subtracted to the sprocket. Thus a slide-rule can divide by two then round up as needed.Screen shot 2013-01-31 at 9.57.21 PM.png
    i.e. going from 50 to 55 teeth adds five teeth to the circle and the chain wraps around the back half seeing only one half (plus a fraction) of these five teeth at any time.
    5/2=2.5
    Thus I’ld cut the new chain three links longer than the 50 tooth sprocket’s chain and hope it fits. Can always use chain breaker to remove the last rounded up additional link if needed.
    Last edited by Fred; 05-07-2017 at 06:22 PM.
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  8. #7
    Member TWBUSHMAN's Avatar
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    Thanks for the info! So how many links is a stock chain?

  9. #8
    Senior Member elime's Avatar
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    Slide the rear wheel as far forward as it will go then re try installing the chain.

    See red arrow:
    Extended rear wheel.jpg
    Last edited by elime; 05-07-2017 at 06:33 PM.
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  10. #9
    Senior Member Fred's Avatar
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    If you Google How many links on stock TW 14/50 geared chain? - Yamaha TW200 ... it immediately tells you 122 links. No waiting.
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  11. #10
    Senior Member elime's Avatar
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    If you slide the rear wheel forward 1" you will need to shorten the chain by 2".

    If you haven't moved the rear wheel as far forward as it will go then that is the next step you have to take. Nothing else matters!
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