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Old 02-27-2009, 08:57 PM   #1
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180 Rear on the R1 - Suspension?

I ordered my new tires today (The new Michelin Power "One"). I have decided to go with a 180 rear for a quicker turn in, but I am wondering if I will need to make any changes to my suspension. Can anyone point me in the right direction? I stayed with a 120 front.


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Old 02-27-2009, 09:00 PM   #2
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Why not do 190/55?

just curious???

I guess you'd have to make changes regardless if you've been riding with the 50
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Old 02-27-2009, 09:12 PM   #3
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180 mo betta IMHO
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Old 02-27-2009, 09:20 PM   #4
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180 mo betta IMHO
Did you have to change the ride height or triple tree at all?
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Old 02-27-2009, 10:27 PM   #5
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A 180 tire isn't going to provide quicker turn in. It will be both smaller in width and in diameter. When you lower the rear of the bike, it slows down turn in making the bike "more stable".

Unless, for some reason, a 180 is taller than a 190.
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Old 02-27-2009, 10:35 PM   #6
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Here is a spec sheet on the BT-003's. The 180 is smaller in diameter and width than the 190/55. So, it should not improve turn in.

Why would racers want to run a 180 on the back?

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Old 02-27-2009, 10:42 PM   #7
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180 saves weight ?
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Old 02-27-2009, 10:44 PM   #8
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Quote:
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A 180 tire isn't going to provide quicker turn in. It will be both smaller in width and in diameter. When you lower the rear of the bike, it slows down turn in making the bike "more stable".

Unless, for some reason, a 180 is taller than a 190.
both of those numbers don't matter when talking turn in the 55 is all that count i would go with 190/55 so you'll have a bigger contact patch.


maybe i'm wrong??
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Old 02-27-2009, 10:45 PM   #9
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180 saves weight ?
yeah it's a lighter tire and it's unsprung weight. and rotational weight. so it matters a whole lot.
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Old 02-27-2009, 10:49 PM   #10
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both of those numbers don't matter when talking turn in the 55 is all that count i would go with 190/55 so you'll have a bigger contact patch.


maybe i'm wrong??
Looking at the spec sheet you can see that the 190 has a bigger diameter as well as width. So it does matter.
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Old 02-27-2009, 11:07 PM   #11
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FWIW I'd recommend going with the 190/55, especially on a 6" wheel.
However, based upon where your set up is now you may raise or lower the rear or front.
If you bring it by, I can measure it with the 190 and then the 180 and better advise you.
BTW, did you get the SF thing resolved?
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Old 02-27-2009, 11:14 PM   #12
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I found a few places where people were discussing 180 versus 190 tires on liter bikes. It appears that some time ago tire choices were more limited and people had to choose from a 180/55 or a 190/50. If those are the only choices, racers were going with the 180/55 due to the advantage of the steeper profile of the tire. Now that 190/55 tires are readily available, it appears nobody runs a 180/55 on a 6 inch rim any longer. The resounding opinion is that the 190/55 provides both the profile advantage of the 180/55 and an increased contact patch. When riders are putting 150+ horsepower down, they want as much grip as they can get. As a matter of fact, I found references to newer tires that are 200's. I think Dunlop is making those.

So... cliff notes. 180/55 tires were used instead of 190/50 "back in the day". The 190/55 is better now because it offers the steeper profile of the 180/55 and an increased contact patch.
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Old 02-27-2009, 11:16 PM   #13
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^Yep!
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Old 02-27-2009, 11:17 PM   #14
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Here is an article from sportrider.com. http://www.sportrider.com/tech/tires...ire/index.html

The Five-Percent Difference
The 190/55 rear tire makes an impression.

In our previous DOT-race tire test we used 180-sized tires exclusively on the 6.0-inch rear rim of the YZF-R1, and that was the choice of most racers at that time. Using a 190/50 tire, with its low profile, sacrificed too much steering quickness to offset any increase in traction the wider tire could theoretically offer.

For this test, however, Metzeler, Pirelli and Bridgestone supplied 190/55 tires. This slight increase in section height gives the 190/55 tire on a 6.0-inch rim a profile closer to the 180/55 tires used on 5.5-inch rims. According to Rich Munson, Metzeler/Pirelli's Logistics and Racing Manager, "The big advantage is the tire has more contact patch [and] also that the profile remains the same as our 180/55ZR17 fitted on a 5.5-inch rim. We wanted to recreate the same feel and grip characteristics that have given us the success we have had with the Supercorsa 180/55ZR17 but on a 6.0-inch rim. By increasing the contact patch with the 190/55ZR17 we have also created a tire that will wear much better than the 180/55ZR17 on the same 6.0 rim. This is important to us with the current horsepower numbers that the new 1000's are putting out."

While a 190/50 has a wider, flatter profile, the 190/55 is almost identical to the 180/55 but on a larger scale to fit a 6.0-inch rim. This should have a positive impact on grip, wear and steering characteristics over the 190/50 or the 180/55 on a 6.0-inch rim.

From the subjective and objective results of the test, the use of 190/55-sized rear tires on the GSX-R may have had a big influence on the outcome.
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Old 02-27-2009, 11:45 PM   #15
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Dude that 180 Power One is tiny, it's literally only a 170. Allan measured it up the other day... your going to want a 190. If I could afford it, I'd never run anything but the Dunlop 200 NTEC. That's the best tire I've ever ridden on, period.
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Old 02-28-2009, 11:51 AM   #16
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Michelin 180 FTW, I run on 'em all the time on a 1098s, GSXR1000 and sometimes an R1.

As far as setup diffs, just measure what you have and make the changes.

Also you could avoid most confusion by stayin OFF the internets. hehehe
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Old 02-28-2009, 12:29 PM   #17
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180 for the win? Which of the top 3 racers in CMRA, CCS, WERA, or AMA are running 180's on the back of their liter bikes? Ba ha ha ha. Maybe you meant 180's 'cause their cheap.
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Old 02-28-2009, 12:48 PM   #18
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Quote:
Originally Posted by maxgs View Post
I found a few places where people were discussing 180 versus 190 tires on liter bikes. It appears that some time ago tire choices were more limited and people had to choose from a 180/55 or a 190/50. If those are the only choices, racers were going with the 180/55 due to the advantage of the steeper profile of the tire. Now that 190/55 tires are readily available, it appears nobody runs a 180/55 on a 6 inch rim any longer. The resounding opinion is that the 190/55 provides both the profile advantage of the 180/55 and an increased contact patch. When riders are putting 150+ horsepower down, they want as much grip as they can get. As a matter of fact, I found references to newer tires that are 200's. I think Dunlop is making those.

So... cliff notes. 180/55 tires were used instead of 190/50 "back in the day". The 190/55 is better now because it offers the steeper profile of the 180/55 and an increased contact patch.
that' the nail on the head
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Old 02-28-2009, 02:17 PM   #19
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Quote:
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180 for the win? Which of the top 20 racers in CMRA, CCS, WERA, or AMA are running 180's on the back of their liter bikes? Ba ha ha ha. Maybe you meant 180's 'cause their cheap.
fixed

and you're right.

I was getting at that wit my first post of this thread.
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Old 02-28-2009, 02:40 PM   #20
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Quote:
Originally Posted by maxgs View Post
180 for the win? Which of the top 3 racers in CMRA, CCS, WERA, or AMA are running 180's on the back of their liter bikes? Ba ha ha ha. Maybe you meant 180's 'cause their cheap.
Just FYI that avatar pic in 'Road&Track's is him on an R1.

Not trying to contribute to the arguement, just sayin'.
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