Rear preload - Ducati 899 Panigale Forum
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post #1 of 12 Old 01-08-2017, 04:06 PM Thread Starter
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Rear preload

Hello people I've tried searching the forum and internet but ain't found much about setting preload on the 899. in the manual it says 17mm of preload. Now Is it 17mm of sag or 17mm of thread on the shock? I've found people set sag at 25/30mm my current sag is 15mm but it just seems harsh
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post #2 of 12 Old 01-08-2017, 07:17 PM
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The manual refers to 17mm of thread.
Around 25mm of sag is where you want to be so it's not surprising you find yours harsh at 15mm.
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post #3 of 12 Old 01-08-2017, 07:31 PM Thread Starter
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Thank for the reply. the manual is pretty vague at times I'll have a play about with it tomorrow
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post #4 of 12 Old 01-09-2017, 03:13 PM Thread Starter
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It can't be 17mm of thread either that doesn't make sense now I'm looking at it
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post #5 of 12 Old 01-09-2017, 05:29 PM
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Originally Posted by Kstation View Post
It can't be 17mm of thread either that doesn't make sense now I'm looking at it
Curious, what made you say that?
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post #6 of 12 Old 01-09-2017, 05:57 PM Thread Starter
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Call it a hunch. if its got more thread (ie tightening the spring) it's got less sag. I do know how to set sag. All I want to know is what the manual is referring to with 17mm of pre load
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post #7 of 12 Old 01-09-2017, 07:22 PM
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I think you are confusing pre-load with sag.
The manual refers to 17mm of thread and yes the more thread showing the more pre-load will be applied to the spring which in turn will result in less sag.
Sag is a measurement of suspension travel, NOT how much thread is showing. More specifically it's how much your bike settles with your weight on board.
There are some threads on this forum i'm sure that will cover how to set sag but if you can't find them then perhaps google or search Youtube on how to set the correct static sag. It's not a one man job.
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post #8 of 12 Old 01-10-2017, 12:55 AM Thread Starter
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I don't think I'm confusing sag with preload. I've got 15mm of sag at the minute and 10mm of thread showing so if I wind up my preload to get 17mm of thread I will basically have no sag at all. Or do I measure from the base of the spring and not the locking nut?
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post #9 of 12 Old 01-10-2017, 01:22 AM
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If you dont know how to set sag, how do you know your sag is 15mm?

How much do you weigh?
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post #10 of 12 Old 01-10-2017, 05:38 AM
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My mistake, I misread your post. It says you DO know how to measure sag. In that case, you can pretty much ignore what the manual says and just get the sag right.

There is more to it than that, of course. You should notice a significant change in geometry when you take out that much preload, unless there's a corresponding change on the other end. You might have to compromise until you can get the correct springs.

Last edited by PatrickR; 01-10-2017 at 05:42 AM.
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