Suspension settings (questions) and help? - Chicagoland Sportbikes
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post #1 of 19 (permalink) Old 08-07-2005, 04:18 PM Thread Starter
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Suspension settings (questions) and help?

Today I attempted to set the rear sag on my 636

stock rider sag was 23.8125mm

now I've adjusted it 35mm

now my static sag is 15.875 now

now I've read it should be between 5-10mm meaning I need a stiffer rear spring. I'll be getting a new suspension setup in spring so how do you guys think this will be for now? I haven't touched the front yet.

Anyone volunteer to help me out next saturday? I'll bring the beer! bike is in naperville
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post #2 of 19 (permalink) Old 08-07-2005, 05:17 PM
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get your rear to about 28-30 depending on how you ride.

front it around 35 mm.

from there you can messing with it if need be to suit you better, but thats a close range.

then ofcourse adjust rebound and compression.



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post #3 of 19 (permalink) Old 08-07-2005, 10:57 PM Thread Starter
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so you're saying I shouldn't worry about static sag?
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post #4 of 19 (permalink) Old 08-07-2005, 11:07 PM
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rider sag is where its at, i highly doubt your going to compress a stock spring, you weigh about 170? or less?

wouldnt even worry about it.



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post #5 of 19 (permalink) Old 08-07-2005, 11:13 PM Thread Starter
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Quote:
Originally Posted by Odysseys
rider sag is where its at, i highly doubt your going to compress a stock spring, you weigh about 170? or less?

wouldnt even worry about it.

lol 185 but I figured rider sag was the big deal. I'm gonna take the rear down to 30, you do the front the same way basically correct? Which knob is it on the fork tube that adjusts that?
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post #6 of 19 (permalink) Old 08-07-2005, 11:16 PM
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The best way I have found to set sag is to use 1/4 to 1/3 of your total suspension travel as sag. Find out how much travel the shocks have by suspending the bike or alteast having some friends pull up on the clipons and rear until it skims the ground and measure. Divide into thirds or a quarter and thats your rider sag baseline. Make sense.

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post #7 of 19 (permalink) Old 08-07-2005, 11:18 PM
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You want your suspension working even when your unweighting the bike, say during hard breaking or excelleration. Having some negative travel left helps stability a lot.

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post #8 of 19 (permalink) Old 08-07-2005, 11:25 PM Thread Starter
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Increasing the offer to beer and pizza..... lol

I just printed out 9 pages of shit on the matter... looks like I'm gonna have my hands full this weekend
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post #9 of 19 (permalink) Old 08-08-2005, 12:18 AM
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Quote:
Originally Posted by NickIF
lol 185 but I figured rider sag was the big deal. I'm gonna take the rear down to 30, you do the front the same way basically correct? Which knob is it on the fork tube that adjusts that?

thats what i said rider sag "with you on the bike" is the important setting not static "you off the bike"

on the top of the fork, its what the rebound adjuster sits in.

turning it in is adding preload, loosen is making it softer.




Last edited by Odysseys; 08-08-2005 at 12:21 AM.
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post #10 of 19 (permalink) Old 08-08-2005, 12:20 AM
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Quote:
Originally Posted by Dr. D
You want your suspension working even when your unweighting the bike, say during hard breaking or excelleration. Having some negative travel left helps stability a lot.

unless you jumping hills with your sportbike you never will "unweight" your bike, or doing a wheelie or stompie.

stabilty has to do with ride height not preload.



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post #11 of 19 (permalink) Old 08-08-2005, 11:44 AM
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The term Static sag is the weight of the machine "without a rider" and how much the suspension is compressed. It just makes things confusing. Don't worry about the static sag.

It sounds like you're on the rite track. Try not to confuse yourself too much.

The tricky part starts when you are adjusting compression and rebound for a whole boat load of reasons.

Like, different tracks, different tire brands, or tire wear.

I was playing around a bit a Grattan yesterday. Since that track is so bumpy and I was getting some strange tire wear I was playing with the clickers.

I'll help you with your road racing if you help me learn how to do really slow wheelies. I can do them on the 4 wheeler, but not on the bike. The slow one's that is.

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Last edited by Grasshopper; 08-08-2005 at 11:47 AM.
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post #12 of 19 (permalink) Old 08-08-2005, 11:57 AM
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jesus nick, setting baseline stuff isnt rocket science! hahahaha!!!

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post #13 of 19 (permalink) Old 08-08-2005, 12:46 PM
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Quote:
Originally Posted by Odysseys
unless you jumping hills with your sportbike you never will "unweight" your bike, or doing a wheelie or stompie.

stabilty has to do with ride height not preload.
Well if you don't have enough rider sag it can be very easy to unweight the bike in the front on the gas or the rear on the brakes. It has a lot to do with stability, if your gasing it out of a corner and the front is too rigid with no sag it will lift the wheel off the ground causing headshake or worse. Or you brake hard enough into a corner and a stiff no sag chassis lifts the back wheel and you have a major stabitity problem when that occurs.

There are more ways to stabilize or unstabilize a chassis than just ride height, lots of components effect the chassis.

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post #14 of 19 (permalink) Old 08-08-2005, 01:21 PM
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Quote:
Originally Posted by Dr. D
Well if you don't have enough rider sag it can be very easy to unweight the bike in the front on the gas or the rear on the brakes. It has a lot to do with stability, if your gasing it out of a corner and the front is too rigid with no sag it will lift the wheel off the ground causing headshake or worse. Or you brake hard enough into a corner and a stiff no sag chassis lifts the back wheel and you have a major stabitity problem when that occurs.

There are more ways to stabilize or unstabilize a chassis than just ride height, lots of components effect the chassis.

True!

But, how much do you want to confuse the fellow? We are talking about a pretty much brand new sport bike here. All that he is trying to do is set his sag. Any modern sportbike is going to have static sag. Static sag usually measures about 5 to 10mm.

Nick, if you are really curious about your static sag, put a zip tie on your fork tube up against the fork seal. Lift on the front end just enough so you don't lift the front wheel, the length between the zip tie and the fork seal while you are unloading the suspension is the static sag.

Static sag: How much the suspension is compressed by the weight of the bike and the bike only.

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post #15 of 19 (permalink) Old 08-08-2005, 01:26 PM
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Quote:
Originally Posted by Odysseys
unless you jumping hills with your sportbike you never will "unweight" your bike, or doing a wheelie or stompie.

stabilty has to do with ride height not preload.

I beg to differ my friend, have you ever blasted over the hill before turn 5 at Grattan raceway in 4th gear pinned? As god as my witness one or both wheels will leave the ground momentarily. This is where your static sag could play a roll.

I guess thats jumping hills on your sportbike eh?

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Last edited by Grasshopper; 08-08-2005 at 01:30 PM.
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post #16 of 19 (permalink) Old 08-08-2005, 05:32 PM
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Quote:
Originally Posted by Grasshopper
I beg to differ my friend, have you ever blasted over the hill before turn 5 at Grattan raceway in 4th gear pinned? As god as my witness one or both wheels will leave the ground momentarily. This is where your static sag could play a roll.

I guess thats jumping hills on your sportbike eh?

front wheel lift, fine, both wheels thats a no no, i am not a ama guy but you go faster and in more control with both wheels on the ground regaurdless.

its kinda like you see the guys go flying off legna seca 2 story drop and say fuck it ill just jump over the 1st left and set myself up for the landing and right hand turn


its all good i am trying to keep it simple, if nick cant adjust rider sag, and learn the art and FEEL what the compression and rebound is doing then as i know he does have a ways to go, when he knows what the bike is doing then he can try to adjust it out for more confidence and keeping the rubber to the ground.



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post #17 of 19 (permalink) Old 08-08-2005, 09:18 PM Thread Starter
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lol I don't plan on doing any big jumps and I know what the difference between the two types of sag is I just wanted to know if it's a big deal that my static sag is 21mm (or whatever I said in the original post)

I'll be setting my front thursday morning I guess.
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post #18 of 19 (permalink) Old 08-08-2005, 09:19 PM Thread Starter
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Quote:
Originally Posted by Vcook
jesus nick, setting baseline stuff isnt rocket science! hahahaha!!!

hahahahah that's what YOU think
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post #19 of 19 (permalink) Old 08-08-2005, 10:51 PM
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Nick,
get your rider sag in the ball park and go from there. There is no magic number. If it feels good then you're set until you get faster and it doesn't work for you any longer. Get it in the ball park and do a track day. You'll know if it's off or not.

As far as jumping goes You WILL catch air off the jump leading to turn 5 at Grattan. To not jump is to go too fucking slow. Watch WSBK at Monza, those boys catch crazy air.
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