Measuring Chain Slack

Discussion in 'Maintenance' started by BoroRich, Jun 30, 2014.

  1. BoroRich

    BoroRich Elite Member

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    How do you guys actually measure your chain tension??

    I measure at a point equidistant between the front and rear sprocket and use a steel rule to measure from bottom of the chain.

    Question is do you pull the chain down to measure the bottom point and then push the chain up to measure the top point or just measure from the lowest point without pulling it down?
     
  2. PeterT

    PeterT Active Member

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    I rotate the chain to find the tightest spot, this is where I take my measurements from. I use a steel ruler in the middle of the swingarm and measure from chain rest to using moderate force to push the chain upwards to get around 30mm. Rotate again and check.
     
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  3. wurzel

    wurzel Active Member

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    Do you have it on the sidestand or a paddock stand cos both will give different measurements
     
  4. BoroRich

    BoroRich Elite Member

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    I have mine up on the paddock stand when I measure it.
     
  5. Barstewardsquad

    Barstewardsquad God Like

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    Bike on sidestand; Put a tape measure on the floor and run it up to the rubber bump strip on the swingarm; lock the tape measure; measure the chain deflection. Tend to do this once a month so never really bother checking for tightest link etc.
     
  6. jamesm09

    jamesm09 Senior Member

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    I never bother measuring, just do it by feel.

    I've only changed one set of chain and sprockets in 7years and 3 bikes.
     
  7. lambchops

    lambchops Elite Member

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    Yes use some force to push th chain through its full movement. I find I can tell when it's at the sweet spot as gear change is much improved
     
  8. Dave V

    Dave V Elite Member

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    Paddock stand and find the tightest spot.

    Normally check/adjust mine every time the bikes cleaned. Don't use a rule, too tights as bad as too loose.
     
  9. Mike07

    Mike07 Active Member

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    I'm not putting myself as an expert, but I've done this for many years with no problems.
    Centre stand/Paddock.
    Spin rear wheel
    Work the chain up and down a bit
    Spin rear wheel
    Steel rule from floor
    moderate/light pressure up then down.
    measure deflection.
    adjust as necessary.
    Repeat till correct twice in a row.
    Cup 'O' Tea.
     
  10. Black

    Black Active Member

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    I've a fairly regimented approach that goes something like this:
    Pull up at meeting/stopping point. Someone points and says " that looks slack mate". I then bend over and, with my finger tips only, flick the chain two or three times to see if it taps against the underside of the swingarm. I then suck and blow knowingly and concede that they might well be right and commit to adjusting it at the earliest possible opportunity.
     
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  11. travellingkiwi

    travellingkiwi Active Member

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    Manual says side stand. Anything else will be wrong... Cause it'll be a different measurement.

    I tighten and measure by eye...

    H
     
  12. PeterT

    PeterT Active Member

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    One eye or two???
     
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  13. travellingkiwi

    travellingkiwi Active Member

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    I was born in sight of Lancaster Park, and lived in SouthBridge... One eyed... Always...

    :)

    H
     
  14. Mike07

    Mike07 Active Member

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    Eye, but you'll have to keep a eye on the slantyness of the ground if it's on the side stand, as it could alter due to eyenstines laws.
     
  15. sinewave

    sinewave God Like

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    Manufacturers only state use the sidestand as all/most bikes have them as standard.

    They aint gunna say use a Paddock stand as non Track Day Peeps or Peeps who like to do more that basic maintenance would complain about having to buy one just for this job.

    I do mine on a Paddock stand but logic dictates that having someone sat on the bike would give the most accurate measurement as this loads/tightens the chain further so unless the OEM allow for this extra loading (which I assume they do) then that's accurate.

    Having said all that I don't use a rule, you can just tell if it's about 2"
    Better slightly slack than too tight as this can wear/damage your gearbox shaft.
    Also check again once you've tightened the Axle nut!
    All bikes I've had tighten the chain further once you do this even though the adjuster bolts are set and nipped up.
     
    #15 sinewave, Jul 5, 2014
    Last edited: Jul 5, 2014
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  16. lambchops

    lambchops Elite Member

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    Good tip sinewave does move when you tighten the main wheel nut. I've taken now to only loosening the wheel nut very slightly (about half turn) and using the adjusters to push the wheel back. Doesn't tighten then when nipping up.
     
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