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? About changing tire and size!!!
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That-boy-wonder
 
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? About changing tire and size!!! - January 13, 2010, 08:06 AM

Awight .net fam...I trust all of you alls knowledge so that's why I am posting this question. I am getting new tires (Metzeler M3 Sportec's) and I am coming from a boring Continental Conti-sport tire that doesn't warm up and doesn't stick to gorilla glue. The suggested rear tire for the gsxr-750 is 180/17 but when I bought the bike the guy had a 190 on the rear. My question is should I stick to the 190 I am used to, or go down to the 180 and which is stock and why. Besides contact surface what are the other benefits of the 190 versus the 180 etc... *Any thoughts ideas and suggestions are appreciated.*


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January 13, 2010, 08:10 AM

different sizes have different benifits

180/55 has very quick turn in but smaller contact patch
190/50 has larger contact patch but slower turn in

this is why most race tires used now are 190/55 because you get the best of both worlds you have the larger contact patch so you can get on the trottle harder on corner exit and still have the quck turn in

hope that helps....


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January 13, 2010, 09:08 AM

I am going to be switching my GSXR600 to a 190 rear this season also. I like the larger contact patch for no other reason than it sounds good in my head. You can get the bike to turn in a little quicker with the 190 by adjusting the rear suspension height a little bit. Do not quote me but somebody told me to put 3 clicks of preload into the spring which would raise the back a little bit and help make the bike turn in more like it had a 180 on it. I am not a suspension guy so do not quote me on that. I am just trying to point out another way to get the benefits out of a 190 with out some of the draw backs.





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January 13, 2010, 09:15 AM

Quote:
Originally Posted by JWZelibor View Post
different sizes have different benifits

180/55 has very quick turn in but smaller contact patch
190/50 has larger contact patch but slower turn in

this is why most race tires used now are 190/55 because you get the best of both worlds you have the larger contact patch so you can get on the trottle harder on corner exit and still have the quck turn in

hope that helps....
when u say turn in...u mean the entry into the turn and how fast u can get to ur lean correct....still only 7 months experience so learning all the term...


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07 GSXR-750 (New hotness!!)

RIP: Angie "A-Boogie" Johnson
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January 13, 2010, 09:19 AM

Quote:
Originally Posted by datboii1der View Post
when u say turn in...u mean the entry into the turn and how fast u can get to ur lean correct....still only 7 months experience so learning all the term...
turn in = corner entrance...having a taller profile tire (height/second number in the numbers) will make the bike lean over quicker thats why a 180/55<---this number feels like its turns in quicker....but having a wider tire (1st number) will give you more rubber on the road (contact patch) this is why alot of race tires are 190/55 (cuz you get the benifits of both)....for the street it really depens on what you want 180/55 or 190/50

this is a pretty good read bout it

http://www.sportrider.com/tech/tires...ire/index.html


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January 13, 2010, 09:21 AM

Did the bike have a 190/50 on there or a 190/55? I would go back to the 180 size that the bike originally came with. The rear ride height can vary quite a bit with most 190/55 taller than 180/55 taller than 190/50. On the street it won't make a damn bit of real world difference anyway so If you like the thought of the bigger tire I guess it won't hurt anything that much, but I have always found the 600's/750's handle better with the 180 on them for street use.
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January 13, 2010, 09:23 AM

Quote:
Originally Posted by Todd View Post
Did the bike have a 190/50 on there or a 190/55? I would go back to the 180 size that the bike originally came with. The rear ride height can vary quite a bit with most 190/55 taller than 180/55 taller than 190/50. On the street it won't make a damn bit of real world difference anyway so If you like the thought of the bigger tire I guess it won't hurt anything that much, but I have always found the 600's/750's handle better with the 180 on them for street use.
Excellent post.


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January 13, 2010, 09:31 AM

so one should switch to 190 when out of rubber on a 180?


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January 13, 2010, 09:41 AM

Quote:
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so one should switch to 190 when out of rubber on a 180?
Just get your body off the bike more. Lot of people race on 180s


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January 13, 2010, 09:43 AM

Difference in tire size between the 180/55 and 190/50 is a little under a 1/3rd of an inch in overall height.
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January 13, 2010, 09:48 AM

The only reason I am switching to a 190 is because I have 2 sets of them in my storage and I am to much of a cheep ass to buy new rubber when I have 2 sets of good rubber sitting there.





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January 13, 2010, 10:19 AM

Another factor not addressed is the size of the rim, you would be shoe horning a 19/55 on 600/750 rim, this would change the profile from its original intention.

Sport rider did an article... http://www.sportrider.com/tech/tires/146_0206_tire_size/index.html



My suggestion, 180.

Oh and if your conti-sports arnt sticking you should look in to; let me rephrase that you need to have your suspension adjusted for your weight and riding style.


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January 13, 2010, 10:21 AM

Quote:
Originally Posted by zx6rfool View Post
Another factor not addressed is the size of the rim, you would be shoe horning a 19/55 on 600/750 rim, this would change the profile from its original intention.

Sport rider did an article... http://www.sportrider.com/tech/tires/146_0206_tire_size/index.html



My suggestion, 180.

Oh and if your conti-sports arnt sticking you should look in to; let me rephrase that you need to have your suspension adjusted for your weight and riding style.

B-rad this isnt really a issue anymore (at least with dunlop idk bout other brands) buty they make thier 190/55 to run on 5.5in rims now.....they dont even make a 180/55 race tire in the US anymore...


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January 13, 2010, 10:38 AM

Maybe regarding race tires, however street 190/50 and 55 tires are still designed for 6+ in wide rims, not the 5.5" rims found on most 600/750s on the road currently.


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January 13, 2010, 11:19 AM

I have done the switching from 180 to 190 then back to 180 on my ZRX 1200. On the 190 the bike felt very slow for turn in and just did not feel very planted. The 180 had better feel when leaned over and made the rear feel lighter which on that bike helped.


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