180 vs 190 size tires on newer liter bikes - Chicagoland Sportbikes
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post #1 of 17 (permalink) Old 07-11-2006, 10:51 AM Thread Starter
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180 vs 190 size tires on newer liter bikes

I recently switched to Dunlop 208 GPA trackday tires in a size 180/55. Lots of people around here and at the track said this was a good idea because the bike would turn in quicker and running trackday compound tires is better than using Qualifiers or Pilot Powers. I recently was told by Chip at KWS Motorsports that running a 180 tire on MY bike is not a good idea because its mounted on a 6 inch rim versus a 5.5 inch and because a bike with 160hp needs the extra traction of a 190. Just wanted to hear some opinions on this from those who have run both sizes. I'm not at a level where I'm using all the power in the corners but I am using the tires to hold up more than the average rider weight at almost 300lbs in full gear.

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post #2 of 17 (permalink) Old 07-11-2006, 10:58 AM
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post #3 of 17 (permalink) Old 07-11-2006, 11:05 AM
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180 - faster turn in
190 - more rubber on the ground

Arguments on this topic are of religious importance to many people. Here is my take. Plain and simple. A litre bike has tons of power, you need the rubber to put the power on the ground. WRT not using all the power in the corners... no one does. If they do, they get to experience a high side (Nice view from up here!). However, when you stand that bike up, you need to put the pedal to the metal.

I am unfamiliar with how additional weight effects the bike and tire choise. My logical assumption would be that the more weight, the more traction required going into braking zones and turns to counter the additional weight.

180s in general are considered easier to ride. Litre bikes in general eat up tires. Personally, I don't know of any NESBA "A" riders using 180s on litre bikes. I am sure that there are some, however.

My .02.

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post #4 of 17 (permalink) Old 07-11-2006, 11:09 AM
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i used Dunlop's last year, 180's.

This year switched to super corsa pro's - 190's!! and they rock!
much more rubber on a turn, can carry a lot more speed with more confidence through a corner. Lot less slipage, and well i guess you can feel the tire a lot better, and feel what its doing (since more of it is in contact with the pavement).

Anyways, guess its personal preference.

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post #5 of 17 (permalink) Old 07-11-2006, 11:15 AM
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I dont think anyone here will ever use a liter bikes HP to its potential, so the more rubber down for horsepower is a "poser" excuse if you ask me. I have run both, I have found that the 190 actually has better turn in and feel (on the street anyway) than the 180 did. The 180 was flatter on the wide rim and offered less contact patch while leaned over. The 190 (I think) gives me more turning traction (regardless if my bike was 200 HP or 100HP) so more rubber down makes sense to me when explained that way (regardless of horsepower). my .02

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post #6 of 17 (permalink) Old 07-11-2006, 11:19 AM
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post #7 of 17 (permalink) Old 07-11-2006, 11:23 AM Thread Starter
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Thanks for the responses.

Wink- What 190 tire brands/models do most of the guys in "A" use? I know they don't make GPAs in 190.

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post #8 of 17 (permalink) Old 07-11-2006, 11:27 AM
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I think that most of the guys are using Dunlops since they are a NESBA sponsor. You can get a great deal on those trackside from the NESBA vendor at any track day. What are they, 208 or 209s?

A couple of guys are using Pirellis as well. Super Corsa Pros or Dragon Slicks.

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post #9 of 17 (permalink) Old 07-11-2006, 11:30 AM
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208GP's are what Matt stocks normally. They come in Soft or Medium compounds, but yeah I do believe they only come in 180's.

The 209 is the new race tire. It's stickier and lasts longer than the 208. Great tire. And it does come in 190. A lot more expensive though.

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post #10 of 17 (permalink) Old 07-11-2006, 11:38 AM
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Quote:
Originally Posted by Nolan1300
I recently was told by Chip at KWS Motorsports that running a 180 tire on MY bike is not a good idea because its mounted on a 6 inch rim versus a 5.5 inch and because a bike with 160hp needs the extra traction of a 190.
Listen to Chip you must, speaks the truth he does, more rubber down you need.

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post #11 of 17 (permalink) Old 07-11-2006, 11:39 AM
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Quote:
Originally Posted by ronhix
Listen to Chip you must, speaks the truth he does, more rubber down you need.
You and your Yoda speak..............

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post #12 of 17 (permalink) Old 07-11-2006, 12:13 PM
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Quote:
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post #13 of 17 (permalink) Old 07-11-2006, 12:53 PM Thread Starter
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Hmmm... Looks like I'll be checking how much Drucker wants for a 190 rear D209.

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post #14 of 17 (permalink) Old 07-11-2006, 01:16 PM
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this is a simple question to answer, from those that are AMA racers.

they either use a 190 or 195 on there rear tire.

the higher profile needs to be adjusted for since this will also affect ride height "so you need to get computrac'd"

from there they give you a wider tire for more side meat, and a higer profile to adjust for faster turn in like a 180.

but all this comes at a higher price.

p.s. i know this inside information for a fact!



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post #15 of 17 (permalink) Old 07-11-2006, 01:24 PM
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190/55 is supposedly the best of both worlds
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post #16 of 17 (permalink) Old 07-11-2006, 05:33 PM
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a 195 is a slick.
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post #17 of 17 (permalink) Old 07-11-2006, 05:55 PM
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Quote:
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a 195 is a slick.

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