Race tire not offered in front wheel size!? - Chicagoland Sportbikes
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post #1 of 52 (permalink) Old 08-07-2006, 06:11 PM Thread Starter
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Race tire not offered in front wheel size!?

So today I decided to shop for some new D208gp's and Power-Race track tires. But nobody carries the correct size for the front. I went to the websites for both manufacturers and it appears that neither of them make a 120/65 for the front. Ok, that explains why nobody carries them. But at this point I'm really confused because I know people are using them on 03-04 ZX6s. So, I think I need to be schooled on the matter. Are they using a non-standard size like 120/70? What gives?

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Stock Rear:180/55/17

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post #2 of 52 (permalink) Old 08-07-2006, 06:18 PM
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If you search the zx6r section on kawiforums.com, there is a ton of info on this. Everyone runs the 120/70 and slides the fork tubes up to compensate.

It might even be stickied in that forum, I haven't checked in a while.
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post #3 of 52 (permalink) Old 08-07-2006, 06:18 PM
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I dont have one of those bikes, but most likely people are using the standard 120/70, then raising the forks in the triple clamps to maintain ride height/geometry.

Last edited by Otis; 08-07-2006 at 06:21 PM.
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post #4 of 52 (permalink) Old 03-24-2007, 02:43 AM
 
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I would think you could run the 120/70 and slide the fork tubes up to compensate
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post #5 of 52 (permalink) Old 03-24-2007, 09:57 AM
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run a 120/70 and slide the fork tubes up to compensate.

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post #6 of 52 (permalink) Old 03-24-2007, 10:02 AM
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run a 120/70 and slide the fork tubes up to compensate.



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post #7 of 52 (permalink) Old 03-24-2007, 10:21 AM
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Sell the bike and buy a gixxer.

or

120/70 and shove it up your fork tubes.

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post #8 of 52 (permalink) Old 03-24-2007, 12:19 PM
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I read someplace that they run a 120/70 and slide the fork tubes up to compensate.

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post #9 of 52 (permalink) Old 03-24-2007, 12:49 PM
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What if you just ran the standard 120/70 front and then slid the fork tubes up to compensate for the change in geometry?

Just thinking out loud.

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post #10 of 52 (permalink) Old 03-24-2007, 01:48 PM
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post #11 of 52 (permalink) Old 03-24-2007, 02:34 PM
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Quote:
Originally Posted by jimzx9r View Post
If you search the zx6r section on kawiforums.com, there is a ton of info on this. Everyone runs the 120/70 and slides the fork tubes up to compensate.

It might even be stickied in that forum, I haven't checked in a while.
+1

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post #12 of 52 (permalink) Old 03-24-2007, 02:34 PM
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I dont have one of those bikes, but most likely people are using the standard 120/70, then raising the forks in the triple clamps to maintain ride height/geometry.
+1

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post #13 of 52 (permalink) Old 03-24-2007, 02:35 PM
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I would think you could run the 120/70 and slide the fork tubes up to compensate
+1

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post #14 of 52 (permalink) Old 03-24-2007, 02:36 PM
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Quote:
Originally Posted by Vcook View Post
run a 120/70 and slide the fork tubes up to compensate.
+1

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post #15 of 52 (permalink) Old 03-24-2007, 03:37 PM
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I am not sure I agree with the widley varied viewpoints here.


Wouldn't it be just as easy to run the 120/70 and slide
the fork tubes up to compensate for the difference ?


Let's not overcomplicate this !


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post #16 of 52 (permalink) Old 03-24-2007, 04:35 PM Thread Starter
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Quote:
Originally Posted by Brian View Post
I would think you could run the 120/70 and slide the fork tubes up to compensate
Quote:
Originally Posted by Vcook View Post
run a 120/70 and slide the fork tubes up to compensate.
Quote:
Originally Posted by Rob View Post
run a 120/70 and slide the fork tubes up to compensate.


Quote:
Originally Posted by Underdog View Post
Sell the bike and buy a gixxer.

or

120/70 and shove it up your fork tubes.
Quote:
Originally Posted by G97 View Post
I read someplace that they run a 120/70 and slide the fork tubes up to compensate.
Quote:
Originally Posted by ronhix View Post
What if you just ran the standard 120/70 front and then slid the fork tubes up to compensate for the change in geometry?

Just thinking out loud.
Quote:
Originally Posted by BLARNEY View Post
I am not sure I agree with the widley varied viewpoints here.


Wouldn't it be just as easy to run the 120/70 and slide
the fork tubes up to compensate for the difference ?


Let's not overcomplicate this !


Tom







Yeah, I figured this one out a while back. I went to the Kawi forums and the advice they gave me was to run a 120/70 and slide the fork tubes up to compensate.

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post #17 of 52 (permalink) Old 03-24-2007, 06:56 PM
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How about trying the 120/70 and not worrring about the forks? You're dealing with a 5% change in aspect ratio, which equates to a theoretical difference in tire sidewall height of, oh, 6mm. You can get more variance than that from identically sized tires manufactured by different companies, not to mention an entirely different shape of the tread area as viewed from the front of the tire, i.e., a rounder vs. more "v" shaped profile. This alone would most likely affect the handling of the bike far more than a change in aspect ratio, should your new tires differ significantly from those originally fitted. Why not try it; maybe you'll like it. Or, as the guys who work on my bikes say, with a shrug,

"What could happen?"

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Last edited by Farmboy69; 03-24-2007 at 07:15 PM.
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post #18 of 52 (permalink) Old 03-24-2007, 08:11 PM Thread Starter
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That's what I did. In my avatar I'm taking the turn just fine with the 120/70's and no fork modification. I just really liked the look of the low profile 120/65's. All that's left to do now is mount curbfeelers so I know when I'm leaning too much and spinners.


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post #19 of 52 (permalink) Old 03-24-2007, 08:56 PM
 
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I also heard that since you're dealing with a 5% change in aspect ratio, which equates to a theoretical difference in tire sidewall height of, oh, 6mm. You can get more variance than that from identically sized tires manufactured by different companies, not to mention an entirely different shape of the tread area as viewed from the front of the tire, i.e., a rounder vs. more "v" shaped profile. This alone would most likely affect the handling of the bike far more than a change in aspect ratio, should your new tires differ significantly from those originally fitted. Why not try it; maybe you'll like it.
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post #20 of 52 (permalink) Old 03-24-2007, 09:26 PM
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you could also leave the forks at stock height and see how you like the 5% or so difference in aspect ratio. it's possible you'd like it.

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post #21 of 52 (permalink) Old 03-24-2007, 09:38 PM
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The difference is only a 5% cahnge. Give the 120/70 a shot with the forks as is. You may like it that way.

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Last edited by Rob, Esq.; 03-24-2007 at 09:40 PM.
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post #22 of 52 (permalink) Old 03-24-2007, 10:11 PM
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Oh gawd...... here we go again !



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post #23 of 52 (permalink) Old 03-25-2007, 07:53 AM
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Ride the bike.

The change may or may not be real. 120/70 does not mean that the tread area is exactly 120 nor does it mean that the aspect ratio is exactly 70%. Additionally, it doesn't tell you if the tire is "round" or "triangular".

If it is actually taller in the front, you'll have more trail, which might be a good thing in a bike considering that they are generally undersprung at the front. That will give you a bit more ground clearance at the same lean angle.

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post #24 of 52 (permalink) Old 03-25-2007, 08:33 AM Thread Starter
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I've liked the theoretical change I've made. I've gotten the impression my tires are octagonal, but the gription has been comparative to that of a covalent bond between rubber and asphalt. In conclusion, the 5% variation with a standard deviation of .96 has had a minimal effect on both lateral "Gees" and thrust vector velocity at the unsprung axis.

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post #25 of 52 (permalink) Old 03-25-2007, 09:29 AM
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Quote:
Originally Posted by pale rider View Post
I've liked the theoretical change I've made. I've gotten the impression my tires are octagonal, but the gription has been comparative to that of a covalent bond between rubber and asphalt. In conclusion, the 5% variation with a standard deviation of .96 has had a minimal effect on both lateral "Gees" and thrust vector velocity at the unsprung axis.


Now ya go it !




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post #26 of 52 (permalink) Old 03-25-2007, 10:42 AM
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Quote:
Originally Posted by pale rider View Post
I've liked the theoretical change I've made. I've gotten the impression my tires are octagonal, but the gription has been comparative to that of a covalent bond between rubber and asphalt. In conclusion, the 5% variation with a standard deviation of .96 has had a minimal effect on both lateral "Gees" and thrust vector velocity at the unsprung axis.
Ah. I see that you have found peace with your modifications without even considering the correlative affects of various additional factors such as ambient air temperature and humidity, track surface temperature and chemical/mechanical composition, and residual heat in the tires as the net result of prior laps/sessions. The possible manifestations of any of the myriad hypothetical riding conditions which could arise from the slightest variation in any one of these criterion is, quite simply, mind boggling; therefore, you have wisely chosen to disregard these additional considerations and just ride your bike. Well done.

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post #27 of 52 (permalink) Old 03-27-2007, 09:21 PM
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Quote:
Originally Posted by pale rider View Post
I've liked the theoretical change I've made. I've gotten the impression my tires are octagonal, but the gription has been comparative to that of a covalent bond between rubber and asphalt. In conclusion, the 5% variation with a standard deviation of .96 has had a minimal effect on both lateral "Gees" and thrust vector velocity at the unsprung axis.
It looks like you are hypothetically getting closer to a theoretical solution here. Theoretically, if you implement a change (in theory mind you), then suffice it to say, that you may just theoretically accomplish what you have been theorizing. Of course, mind you, this is only hypothetical.

Unfortunately, in reality, you may have a little bit of a hiccup here. When calculating the covalent bond, you have erred. You see, in a true covalent bond, there would be a chemical link between two atoms in which electrons are shared between them. Since the sources in your theoretical change hypothesis are neither atomic level elements (rubber & asphalt), nor do they share electrons, it is impossible for a covalent bond to be shared or developed. However, if such theoretical bond could exist, I think that you might find that the covalent bond strength to be inversely proportional to the forward motion of your vehicle. That is the bad news, theoretically. HOWEVER, in the event that you could develop a theoretical covalent bond, you would most assuredly be able to guarantee beyond any reasonable doubt that neither a highside, nor a lowside event could ever occur once said covalent bond existed, theoretically speaking, of course.

Oh, and rep sent for your ability to think ouside the box.

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post #28 of 52 (permalink) Old 03-27-2007, 09:26 PM
 
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be a man, throw some 40 inch rims on the bike and rail the twisties
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post #29 of 52 (permalink) Old 03-27-2007, 09:29 PM
 
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oh, don't forget to slide the fork tubes up to compensate but it really shouldn't matter that much
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post #30 of 52 (permalink) Old 03-27-2007, 09:31 PM Thread Starter
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be a man, throw some 40 inch rims on the bike and rail the twisties
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oh, don't forget to slide the fork tubes up to compensate but it really shouldn't matter that much
...and with these posts, the chain is broken.

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