Looking for Sweet Numbers for '01 GSXR 750 - Chicagoland Sportbikes
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post #1 of 18 (permalink) Old 03-18-2008, 11:50 PM Thread Starter
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Looking for Sweet Numbers for '01 GSXR 750

So I need to help set up the geometry on Insomniac's bike for the track this season. Do any of you have the sweet numbers for the track for an '01 Gsxr 750?

I need to get the geometry set for his first day on the track. It is gonna be hard enough for him on an old-school 750, so any help would be appreciated.

Thanks in advance!

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post #2 of 18 (permalink) Old 03-25-2008, 09:37 PM
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While your looking for numbers... I need some base line settings for a '96 GSX_R750 SRAD. Yes, you read that right.

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post #3 of 18 (permalink) Old 03-25-2008, 09:56 PM
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12.7 on the swingarm, 'bout 3m showing in the forks.

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post #4 of 18 (permalink) Old 03-25-2008, 09:59 PM
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Quote:
Originally Posted by BLARNEY View Post
12.7 on the swingarm, 'bout 3m showing in the forks.

Tom
Thanks!

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post #5 of 18 (permalink) Old 03-25-2008, 10:00 PM
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Quote:
Originally Posted by Wink View Post
It is gonna be hard enough for him on an old-school 750, so any help would be appreciated.
Why? Because it makes 140 RWHP?

Get the bathroom scales out. 49% on the rear tire, 51% on the front. Adjust ride height on shock and forks accordingly. If you don't have an aftermarket shock, you probably won't get there. Maybe you will though.

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post #6 of 18 (permalink) Old 03-25-2008, 10:16 PM
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Quote:
Originally Posted by Grasshopper View Post
Why? Because it makes 140 RWHP?

Get the bathroom scales out. 49% on the rear tire, 51% on the front. Adjust ride height on shock and forks accordingly. If you don't have an aftermarket shock, you probably won't get there. Maybe you will though.
Not trying to question anybody, just trying to learn.

I had read that the K-bikes were 51.7 to the front, from the factory. Whereas the SRAD's are 50-50. How much of a difference would changing the weight bias front to rear make, if the geometry stayed the same?

Example, Put a 5lb. weight on the nose, as opposed to the tail.

Wouldn't changing the head angle, fork offset, make a larger impact on handling than weight bias? How does swing-arm angle affect handling? I am aware that Blarny gave me the swing-arm number to start with, but if I were to adjust it how does that affect handling?

Is there a book I can buy that is in depth to this subject? Chassis, and suspension design has always intrigued me.

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post #7 of 18 (permalink) Old 03-25-2008, 10:23 PM
 
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2001 is old school?

Damn.
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post #8 of 18 (permalink) Old 03-25-2008, 10:30 PM
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Quote:
Originally Posted by sqrly View Post
Not trying to question anybody, just trying to learn.

I had read that the K-bikes were 51.7 to the front, from the factory. Whereas the SRAD's are 50-50. How much of a difference would changing the weight bias front to rear make, if the geometry stayed the same?

Example, Put a 5lb. weight on the nose, as opposed to the tail.

Wouldn't changing the head angle, fork offset, make a larger impact on handling than weight bias? How does swing-arm angle affect handling? I am aware that Blarny gave me the swing-arm number to start with, but if I were to adjust it how does that affect handling?

Is there a book I can buy that is in depth to this subject? Chassis, and suspension design has always intrigued me.
Yes all of that. LOL!!! Does your bike handle ok now? There are tons of books all about geometry setup, suspension set up and different approaches to this and that.

The key is to stay as close to home as stock as possible. How picky should we get as amatuers, trackday riders, and club racers?

When it comes to the point where .7 percent of weight bias one way or the other makes that big of a difference for me I'll hopefully be paying a mechanic to make those nit picky adjustments.

If a bike is at 50/50 I'd say leave it. Weight bias starts changing more noticably when you start stripping the bike of unneeded street parts and replacing parts with ones that weigh less.

Too drastic of adjustments with where the forks are in the trees and rear shock ride height adjustments can really destroy the way a bike handles thats why I say stay close to home with geometry. The engineers who designed these modern late model sport bikes know what they're doing. And a 01 Gixxer is not old school. A 1972 CB750 AHRMA road racer is old school.

Don't forget adjusting where your rear axle is in the swingarm affects the geometry to. IE tightening and loosening your chain...

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Last edited by Grasshopper; 03-25-2008 at 10:34 PM.
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post #9 of 18 (permalink) Old 03-25-2008, 10:46 PM
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Quote:
Originally Posted by chach View Post
2001 is old school?

Damn.
00-03 gsxr750 is fricken great bike.

Chris
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post #10 of 18 (permalink) Old 03-25-2008, 11:06 PM Thread Starter
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Quote:
Originally Posted by BLARNEY View Post
12.7 on the swingarm, 'bout 3m showing in the forks.

Tom
Tom,

Is that for me, or SQRLY... or both of us?

Thanks,

===========
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post #11 of 18 (permalink) Old 03-25-2008, 11:08 PM Thread Starter
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The Old School reference wasn't that it is old... you guys know I have OLD bikes... it was in reference to the fact that it is the old frame style. And FWIW... I had an 01 and an 03... HUGE difference in handling from the current crop of Gixxers.

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post #12 of 18 (permalink) Old 03-27-2008, 11:22 PM
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post #13 of 18 (permalink) Old 03-28-2008, 08:32 AM
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Sorry Jim....



No chassis fiddling there other than fork height.


Would suggest these are the best compromise numbers they can arrive at
with new stock components and a limited number of adjustments.


You can do much better.


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post #14 of 18 (permalink) Old 03-28-2008, 08:34 AM
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Quote:
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Tom,

Is that for me, or SQRLY... or both of us?

Thanks,



It's for the 00 - 03 GSXR specifically.


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post #15 of 18 (permalink) Old 03-28-2008, 08:57 AM
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Quote:
Originally Posted by BLARNEY View Post
It's for the 00 - 03 GSXR specifically.


Tom
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post #16 of 18 (permalink) Old 03-28-2008, 09:11 AM
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Quote:
Originally Posted by BLARNEY View Post
It's for the 00 - 03 GSXR specifically.


Tom
Bummer for me.

Does anybody have a book title that I can look for reguarding the technical details of motorcycle geomitery? I do not want somthing watered down like a Keith Code book. Somthing in depth. Like an engineering book or somthing.

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post #17 of 18 (permalink) Old 03-28-2008, 09:17 AM
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Bummer for me.

Does anybody have a book title that I can look for reguarding the technical details of motorcycle geomitery? I do not want somthing watered down like a Keith Code book. Somthing in depth. Like an engineering book or somthing.


I would start with your bike at stock height unless someone has a tried
and tested suggestion.

Set sag to determine where we are spring rate-wise.

We can get the clickers close in the pits.


Then, go ride it and see how it behaves and what you dislike.


Here a click, there a click..... all the way to perfection.



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post #18 of 18 (permalink) Old 03-28-2008, 09:37 AM
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This is a pretty decent article about motorcycle geometry.

http://www.sportrider.com/tech/146_0310_art/index.html

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