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Rear shock 'race sag'
Suspension Q&A with Jeremy Wilkey

07-01-2009, 11:05 PM
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Sponsoring Member
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Join Date: Jul 1999
Location: Manteca Ca.
Posts: 194
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Rear shock 'race sag'
When we set 'sag' to the proper hieght for the rider's weight what fork angle are we actually trying to attain. I have access to a digital inclinometer and could measure directly in the fork tube. It would be easier than the tape measure from rear axle to fender trick (I think) 
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Dirty Dave
'Hey, Grandpa. Can we go on a longer trail this time?'
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07-02-2009, 07:28 AM
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Owner, MX-Tech
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Join Date: Jan 2000
Location: Bourbonnias IL
Posts: 1,452
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Interesting question, but sag is about having "lose" travel in the rear more than fork angle, althought as you know the 2 are related.
Jer
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07-02-2009, 07:45 AM
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Old MX Racer
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Join Date: Oct 2006
Location: Merrillville,IN.
Posts: 5,685
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Tape measure? Sag tool yes!
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WHEN IN DOUBT, GAS IT!
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07-02-2009, 10:07 AM
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Registered
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Join Date: Jun 2007
Location: portugal-center
Posts: 554
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some service manual say what is the correct angle for the steering headstock. donīt know if itīs valid to attain the correct sag.
but itīs very easy to get the correct sag with a measuring tape... 
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"acho que os portugueses pensam demasiado naquilo que querem comprar. talvez fosse boa ideia pensarem mais naquilo que ja tem." diogo morgado, jornal i
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07-02-2009, 11:15 AM
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Join Date: Jul 1999
Location: Manteca Ca.
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Quote:
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Originally Posted by Jeremy Wilkey
Interesting question, but sag is about having "lose" travel in the rear more than fork angle, althought as you know the 2 are related.
Jer
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Hmmm... So... 'sag' is directed more at shock spring tension than attaining/maintaining a particular fork angle for best handling during the ride?
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07-02-2009, 08:45 PM
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Join Date: Aug 2005
Location: E. Carolina
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Once sag is set you can adjust the fork angle but moving the legs in the clamp.
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07-02-2009, 10:31 PM
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Old MX Racer
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Join Date: Oct 2006
Location: Merrillville,IN.
Posts: 5,685
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Generally, the sag is set, the front is happy. Fork height only makes a difference in turning and the dreaded head shake when you have them up too high.
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07-04-2009, 12:33 AM
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Join Date: Jul 1999
Location: Manteca Ca.
Posts: 194
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well thanks all. I just thought that of the various dimensions given from the factory,i.e. rake... trail... steering head angle... one was the object of setting rear shock sag. And i do have a handle on the ol' tape measure but i thought throwing in a little digital technology would be cool and cheaper than the 'sag tool'.  Any Hooo... I'm good... Thanks. Over and out...
D. Dave
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