Suspension Geometry - Kawasaki ZX-10R.net
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post #1 of 14 Old 12-21-2005, 02:03 PM Thread Starter
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Question Suspension Geometry

Happy holiday greetings all,

Some suspension experts say that geometry is 75% of your ideal setup. I am planning to stay with bone stock components at the moment as Santa didn't agree i was worth it this year.... Need a bit of assistance with setup.

From reading previous posts we have some that dropped the forks through the tripples a bit and raised rear ride height with shims. Some that do either one or the other and some do both.

I want to set up to run at Portland and Spokane raceway, both fast smooth tracks. I get on the gas early so I would like to keep the front end as planted as possible at the exits while holding a line.

Preload, compression and rebound will be setup to my liking based on conditions and weight.

Question is, what would be a good starting point for ride height front and rear?

Appreciate any help, thanks!

Tito

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post #2 of 14 Old 12-21-2005, 02:32 PM
 
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Tito,

I don't think there is a simple answer to your question because it really depends on too many variables. I recommend you to get together with a reputable suspension guy that has experience setting up racebikes for Portland.

Sag is the first thing you do (with full riding gears on), then set ride heights according to your physique, weight, how you want the bike to handle and the tires you will be using.
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post #3 of 14 Old 12-21-2005, 03:02 PM Thread Starter
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Quote:
Originally Posted by Archille
Tito,

I don't think there is a simple answer to your question because it really depends on too many variables. I recommend you to get together with a reputable suspension guy that has experience setting up racebikes for Portland.

Sag is the first thing you do (with full riding gears on), then set ride heights according to your physique, weight, how you want the bike to handle and the tires you will be using.
I understand where you are coming from Archille. I have tweaked on my suspension for many years. I do plan on contacting a suspension specialist at the track, but was hoping for a baseline height setting that seems to work with the vast majority in the meantime.

I'm 215lbs with gear and running Pilot Powers 120/70 fr and 190/50 rear.

I was thinking of leaving the front ride height as is and the rear +3mm.

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post #4 of 14 Old 12-21-2005, 03:08 PM
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Quote:
Originally Posted by Tito
I understand where you are coming from Archille. I have tweaked on my suspension for many years. I do plan on contacting a suspension specialist at the track, but was hoping for a baseline height setting that seems to work with the vast majority in the meantime.

I'm 215lbs with gear and running Pilot Powers 120/70 fr and 190/50 rear.

I was thinking of leaving the front ride height as is and the rear +3mm.
If I were you...

I'd leave every thing stock till you get there.

Honestly, if you start getting your geometry too far from stock...you could come upon stability problems.

If it were me Id go to the track stock...if she turns in to slow for you...lower the front a few mm.




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post #5 of 14 Old 12-21-2005, 03:11 PM
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Quote:
Originally Posted by hillcountry10r
If I were you...

I'd leave every thing stock till you get there.

Honestly, if you start getting your geometry too far from stock...you could come upon stability problems.

If it were me Id go to the track stock...if she turns in to slow for you...lower the front a few mm.
+1 go there stock as Hill said and then make very small changes and keep track on a notebook or something what you have changed and where your settings are at. Main thing is to know where you are and what you have changed so you can go one way or another based on the results on the track
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post #6 of 14 Old 12-21-2005, 07:13 PM
 
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...I am 5'6" and 150 lbs. I like my bike to fall into the corner with very little effort. As soon as I leaned in I am already back on steady throttle. I am very progressive with the throttle so by the apex I already started my drive out of the corner. These preferences of mine into and out of the corner create a bit of a set up contradiction. So we focus on setting up the rear the geometry, brought the forks up the triple by 1 ring (~4mm) then use the BST CF front rim to quickened the steering further. I like my suspension on the extra-stiff side so I can feel the movement and slippage. Contrary to others, the OEM suspension works perfect for me without any revalving. I had a few local fast guys rode my bike at Spring Mountain Motorsport Ranch (Pahrump, NV) and was told that it's lively. To me, it's effortless, thus perfect. I haven't found any one else with the same setup and I doubt if anyone else prefers it.

BTW, my ride height is close to stock.
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post #7 of 14 Old 12-22-2005, 01:15 PM Thread Starter
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Thanks for the input. I'm going to leave ride height at stock settings until i am able to re evaluate at the track. For now I'm going to set the sag (dif b/t static and rider) 35mm up front and 25mm in the rear.

Is there an adjustment to get more free sag out of your suspension or is this determined by preload? Is there an optimal range b/t free sag and rider sag?

Spoke with a kawasaki chasis eng at a track day and he suggested to get as much free sag as possible.

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post #8 of 14 Old 12-22-2005, 01:39 PM
 
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post #9 of 14 Old 12-22-2005, 02:24 PM Thread Starter
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Quote:
Originally Posted by Archille
Great article, thanks archille. I read this before when setting up my old bike and loved it, but didn't keep it! It answers my free sag question.

Cheers

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post #10 of 14 Old 12-22-2005, 03:15 PM
 
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i,ve not run my 10 at the track but i,ve been told that the stock settings are pretty good for the track(i softend it off for the road)now i,ve just fitted wp shock and ohlins r+t forks(not road the bike yet with these fitted)but my advice is to get a suspension specialist to set it up for u and ask him wot he has done his advice will be second to none(use someone that has set up race bikes).i have owned a very ill handleing mv agusta and i took this bike to kais in manchester(uk) for a set up this cost me 40 quid and it was the best 40 quid i,ve EVER spent on a bike(btw kais has worked on alot of the bsb race bikes) my point is that i leave my bike to the experts now and my 10 will get a full set up with the new suspension after want they did with the mv it was a completly different bike
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