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post #1 of 42 Old 06-03-2013, 11:10 PM Thread Starter
 
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Suspension Setup wrong?

So I have measured my preload and set it as best I can with 2 people. I know the rear is accurate, front may be off as much as 10mm, in either direction. However, when downshifting under braking (in first especially) I hear a little bit of a tire chirp. I am almost 100% certain it is not from the front, as the front does not appear to slide or lose traction under braking, and while I have had the rear squirm around when I am braking hard, it was only after setting up my preload that I noticed a brief chirp.

Anyone have any ideas what would be causing this?
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post #2 of 42 Old 06-04-2013, 12:10 AM
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Re: Suspension Setup wrong?

Quote:
Originally Posted by n0rth View Post
So I have measured my preload and set it as best I can with 2 people. I know the rear is accurate, front may be off as much as 10mm, in either direction. However, when downshifting under braking (in first especially) I hear a little bit of a tire chirp. I am almost 100% certain it is not from the front, as the front does not appear to slide or lose traction under braking, and while I have had the rear squirm around when I am braking hard, it was only after setting up my preload that I noticed a brief chirp.

Anyone have any ideas what would be causing this?

You are blipping the throttle on downshifts?

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post #3 of 42 Old 06-04-2013, 12:21 AM
 
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Re: Suspension Setup wrong?

The cause of your problem is riding too hard with a passenger on board.

Or too much rear preload causing the tyre to skim the ground under heavy braking. You choose.
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post #4 of 42 Old 06-04-2013, 4:11 AM Thread Starter
 
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Re: Suspension Setup wrong?

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You are blipping the throttle on downshifts?
Yes. I have 0mm of static preload and 16mm with me on the bike (rear).
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post #5 of 42 Old 06-04-2013, 5:04 AM
 
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Re: Suspension Setup wrong?

You want around 30-35 with you on it, and 5-10 without. Amorti hit the nail on the head.

If the bike isn't braking properly, you don't start by rebuilding the engine.
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post #6 of 42 Old 06-04-2013, 5:49 AM
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Re: Suspension Setup wrong?

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Originally Posted by n0rth View Post
Yes. I have 0mm of static preload and 16mm with me on the bike (rear).

Why did you set it to zero?
I like firm suspension but you have to have some extension available :-)

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post #7 of 42 Old 06-04-2013, 6:27 AM
 
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Re: Suspension Setup wrong?

OK remind us how you set this up again as ive forgotten and need to do mine again... Measure from where to where on the rear?



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post #8 of 42 Old 06-04-2013, 6:28 AM
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Re: Suspension Setup wrong?

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Originally Posted by Lambchops View Post
OK remind us how you set this up again as ive forgotten and need to do mine again... Measure from where to where on the rear?

Centre of axle to some fixed point on the tail.

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post #9 of 42 Old 06-04-2013, 7:43 AM Thread Starter
 
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Re: Suspension Setup wrong?

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Originally Posted by bladeracer View Post
Why did you set it to zero?
I like firm suspension but you have to have some extension available :-)
0 is the static (without me on it) and sky, I'm almost 100% that its 20-35mm for front and 15-20mm rear.

Is this wrong?

As a note this is what I read on motionpro.

Last edited by n0rth; 06-04-2013 at 7:53 AM.
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post #10 of 42 Old 06-04-2013, 7:51 AM
 
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Re: Suspension Setup wrong?

Thanks BR

If I remember correctly, you should measure with the rear wheel off the ground first to find the start point. Then with the bike on the ground without you on it, this is the static, then get on this is the loaded. If you have no movement of the suspesion when on its own weight from the raised measurement your shock has too much preload on the spring.



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post #11 of 42 Old 06-04-2013, 7:56 AM
 
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Re: Suspension Setup wrong?

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Originally Posted by n0rth View Post
I'm almost 100% that its 20-35mm for front and 15-20mm rear.
Other way around

There should be a small amount of sag between no weight on the wheels, and the weight of the bike (this is static sag).

If the bike isn't braking properly, you don't start by rebuilding the engine.
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post #12 of 42 Old 06-04-2013, 7:57 AM
 
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Re: Suspension Setup wrong?

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Originally Posted by Lambchops View Post
If I remember correctly, you should measure with the rear wheel off the ground first to find the start point. Then with the bike on the ground without you on it, this is the static, then get on this is the loaded. If you have no movement of the suspesion when on its own weight from the raised measurement your shock has too much preload on the spring.



Quote:
Originally Posted by n0rth View Post
I'm almost 100% that its 20-35mm for front and 15-20mm rear.
Other way around

There should be a small amount of sag between no weight on the wheels, and the weight of the bike (this is static sag).

http://www.gostar-racing.com/informa...ion_set-up.htm

If the bike isn't braking properly, you don't start by rebuilding the engine.
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post #13 of 42 Old 06-04-2013, 8:45 AM
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Re: Suspension Setup wrong?

Quote:
Originally Posted by Lambchops View Post
Thanks BR

If I remember correctly, you should measure with the rear wheel off the ground first to find the start point. Then with the bike on the ground without you on it, this is the static, then get on this is the loaded. If you have no movement of the suspension when on its own weight from the raised measurement your shock has too much preload on the spring.

Yep, that's correct. You have to have some sag in the suspension or there's nothing left for extension as you unload it.

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post #14 of 42 Old 06-04-2013, 8:48 AM
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Re: Suspension Setup wrong?

Quote:
Originally Posted by n0rth View Post
0 is the static (without me on it) and sky, I'm almost 100% that its 20-35mm for front and 15-20mm rear.

Is this wrong?

As a note this is what I read on motionpro.

It does all come down to personal preference but you should have some static sag in it.
Work on 25-30% of travel front and rear and adjust from there to suit your personal preference.
Also check that the forks are not hitting mechanical bottom under braking as that will cause front tyre lockup and chirping.

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post #15 of 42 Old 06-04-2013, 11:05 AM Thread Starter
 
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Re: Suspension Setup wrong?

Front tyre doesnt appear to be locking, I know (with near certainty) they are not bottoming out. I have 2 lines showing on a my F4i on front preload. The rest of the settings are stock. I weigh 140lbs.

Set up the rear preload to have 26-28mm of travel. Went for a ride and still heard the chrip once.
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