'07 GSXR 750 Fork Extenders - Chicagoland Sportbikes
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post #1 of 31 (permalink) Old 05-26-2011, 11:45 AM Thread Starter
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'07 GSXR 750 Fork Extenders

I purchased a used 2007 GSXR 750 that will serve dual purpose between street and track riding. Through my research and prep for the track, I have come across a few threads regarding "fork extenders" for the 2006-2007 year bikes.

First, I do not plan on putting a 190 tire on the rear - I will run Michelin 120-70/180's. According to Suzuki, the rear spring is a heavier spring and should accomodate my weight. However, I have not had the sag or "bouncy bounce test" set. The discussions I have read say both yes you need them and no you do not.

For those of you who have this model and year bike, are these a necessity and something I should look at purchasing and installing prior to my first track day? Or, are these based on rider set-up and comfort after track time trial?

Thanks in advance.

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post #2 of 31 (permalink) Old 05-26-2011, 11:57 AM
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its rider set-up, some folks like to raise the whole bike up for clearance, the rear can be easy to raise but with out the extenders you cant raise the front much, i dont have this year gsxr but thats common practice
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post #3 of 31 (permalink) Old 05-26-2011, 12:21 PM
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You're not going to die if you don't have them.

However, your GSXR needs a lot more trail than is available from the stock fork length....so yes get them when you get a chance.

We sell them and also have a shim kit available for the rear stock shock as well.

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post #4 of 31 (permalink) Old 05-26-2011, 12:36 PM
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its a setup thing, I have them on my 07 600 which is the same frame as your bike.

what it does is help to increase the amount of trail in the front end, using just the extenders alone will increase the effective rake as is will rais the front end of the bike up, this will leave the bike slower to turn in(it also happens to be how my bike is set up currently.) to negate the added rake the rear end is raised up, in the process swing arm angle is also increased and this does something to rear end traction but im not clear on what it actually does.

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post #5 of 31 (permalink) Old 05-26-2011, 12:54 PM
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Crappy gixxers. Jeez.
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post #6 of 31 (permalink) Old 05-26-2011, 01:09 PM
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51% of the weight of the motorcycle on the front wheel 49% on the rear.

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post #7 of 31 (permalink) Old 05-26-2011, 01:30 PM
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Quote:
Originally Posted by Uncle Steve View Post
I prefer 100% in my rear but I'm crazy like that.
yeah you are, weirdo.

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post #8 of 31 (permalink) Old 05-26-2011, 01:31 PM
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Quote:
Originally Posted by Grasshopper View Post
51% of the weight of the motorcycle on the front wheel 49% on the rear.
time to go get the bathroom scale then

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post #9 of 31 (permalink) Old 05-26-2011, 01:34 PM
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OMG I just read what I wrote. LOL
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post #10 of 31 (permalink) Old 05-26-2011, 03:09 PM
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Quote:
Originally Posted by Uncle Steve View Post
I prefer 100% in my rear but I'm crazy like that.
Good god. I hope you are talking about doin wheelies.

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post #11 of 31 (permalink) Old 05-26-2011, 03:14 PM
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I'm a little disturbed after reading this and have to re evaluate my friendship with Steve right now. LOL!

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post #12 of 31 (permalink) Old 05-26-2011, 03:28 PM
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i have that bike, i dont have the extender though. i do have f/r aftermarket
suspension components. i like the bike like it is (meaning the way i have it set)
it turns in aggressive and feels good mid-corner, same on exits. if ya want to
take a closer look dean come and check it out. i'd say, make sure you have the
proper spring rates, get the sag set-up and go from there. gl

almost forgot, different tire profiles (dots vs. slicks) regarding front tire, require
me to raise or lower the triple clam 5mm. hope this helps, i'm no expert, but it
goes pretty good for me like this.

418

Last edited by Dug2; 05-26-2011 at 03:32 PM.
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post #13 of 31 (permalink) Old 05-26-2011, 03:33 PM
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^ clamp

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post #14 of 31 (permalink) Old 05-26-2011, 04:20 PM
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Yes the GSXR 600/750's will work with the stock forks pulled down flush in the triple.

However, they are a lot better with the fork cap extenders.....gives you more trail which equals more stability under braking and makes it a lot harder to tuck the front in the middle of the turn and gives you more feel when you are finding the limit.

When you start going fast....you have to have these at some point or you will enjoy crashing when you start to loose the front and can't save it.

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post #15 of 31 (permalink) Old 05-26-2011, 04:24 PM
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And to edgumacate those with GSXR's a little further....here's the proper numbers for most track/club guys on the ride height in the back.

324-328mm measuring the rear shock from eye to eye (top bolt to bottom bolt in the same place).

When doing this...the bike should have stands on the footpegs so the rear wheel is unloaded and swingarm fully extended...not as accurate with a stand holding the rear of the bike up on spools because the suspension is compressed.

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post #16 of 31 (permalink) Old 05-26-2011, 04:43 PM
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hey kev, can u recommend a brand/set of these fork extenders? u sure
are sellin me on these, at least i would like to investigate them.

to the op, dean, where/who/why got you lookin into these. now i'm curious.
anything to go fast

418
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post #17 of 31 (permalink) Old 05-26-2011, 05:03 PM
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what yrs gsxr needs these? do 04-05s need these?
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post #19 of 31 (permalink) Old 05-26-2011, 05:08 PM
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want, use, benifit from,,, but if its fly, i will need them
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Quote:
Originally Posted by elroy121 View Post
but if its fly, i will need them

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a question about the additional trail added by the extenders...

will that additional trail make the bike less likely to want to "stoppy" under braking, and thus letting me barke harder?

-Jason
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post #22 of 31 (permalink) Old 05-26-2011, 05:11 PM
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want, use, benifit from,,, but if its fly, i will need them
There you go.

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post #23 of 31 (permalink) Old 05-26-2011, 05:12 PM
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Quote:
Originally Posted by Pilotx1 View Post
a question about the additional trail added by the extenders...

will that additional trail make the bike less likely to want to "stoppy" under braking, and thus letting me barke harder?
Jason, you do realize to notice the symptons of not using this mod you must push your fucking motorcycle pretty damn hard right? Like, push it so it does weird shit.

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post #24 of 31 (permalink) Old 05-26-2011, 05:14 PM
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I do realize id have to push the bike hard, harder than im likely anywhere near pushing it

i already have the extenders, at this point im looking to learn the finer details of how certain changes affect things

-Jason
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post #25 of 31 (permalink) Old 05-26-2011, 05:15 PM
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Jason...yes it will give more stability under braking and less stoppies....unless you are totally collapsing the front from not enough compression or have the ride height jacked up to the moon or your rebound can be off...did that give you enough options???

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post #26 of 31 (permalink) Old 05-26-2011, 05:15 PM
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Traxxion Dynamics is what I use...their stuff is all top notch and they manufacture everything in house.

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post #27 of 31 (permalink) Old 05-26-2011, 05:16 PM
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Jason,
Check out the sport rider stuff: http://www.sportrider.com/suspension...ide/index.html

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post #28 of 31 (permalink) Old 05-26-2011, 05:23 PM
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Quote:
Originally Posted by Safety First View Post
Jason...yes it will give more stability under braking and less stoppies....unless you are totally collapsing the front from not enough compression or have the ride height jacked up to the moon or your rebound can be off...did that give you enough options???
yep, cool thanks kevin

Ive got a few pics of my bike going into 1 at bhf and it certainly looks like Ive got a ways to go before bottoming out but I also noticed that I was getting to the point of having the rear end start coming up
the ride height is anythign but jacked up, just sitting the bike looks like its sitting nose high

ill be making adjustments this weekend and hopefully the more i understand what im doing the less chance i have of completely screwing it up

I do have a chart and record everythign i do to the suspension in it so i can undo things later too

-Jason
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post #29 of 31 (permalink) Old 05-26-2011, 05:40 PM
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You need the bike to get down into the stroke...there's a bunch of alternatives that can cause the bike to leverage up, but also there is a point of it's going to come up regardless when you are braking really hard.

The gauge of that is if you can brake WAY deeper than anybody else if the bike is setup properly.

I used to watch Mladin at Road Atlanta going into turn one from the pit wall.....that dude would brake a full brake marker later than any other factory guy...think about that...they are all already on the edge and he was running it in there lap after lap way deeper and the bike was just really planted.

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post #30 of 31 (permalink) Old 05-26-2011, 06:00 PM
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damn, i also heard that his front rate was a 1.1.
good info kev, thanks man

418
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