180 vs. 190 rear tire - Page 2 : Honda CBR 1000RR Motorcycle Forums: 1000RR.net

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Old 01-01-2010, 09:51 PM   #11
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If you have seen any of my videos the guy's I ride with run 180/55/17. They are faster then me through the corners and I ride pretty dam fast. They have never had an issue with traction and run the 180 because the tires are less expensive. the difference in the 180-55-17 and 190-50-17 are minimal at best. Think about Mick Doohan and what he could do on those tires "smaller tire sizes" back in the day. The tires we have now can sustain allot more then most of us can dish out. You will be fine.
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Old 01-02-2010, 02:37 AM   #12
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Originally Posted by philip1000rr View Post
It should make it less flickable because the width of the rim will stretch the tire and flatten the curve of the tread, leaving it more like a cruiser tire. It won't fail on you due to the width of the rim, however.

This has been debated to death before, and some people use them without issue. I wouldn't ride with the wrong size tire though. I'd get the proper 190 size for your 6" rim.
I have tried my 2004 RSV Mille Factory with both combinations, more than once, and the difference in flickability is huge in favour for the smaller tire. Now I am not quite sure if the Factory has a 5,5 or 6 inch rear rim
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Old 01-02-2010, 04:07 AM   #13
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180 over a 190 will and give u a bigger lean angle the bsb race team (padgets) around here use a 180 go back but dont change for a 190 slip your tyre fitter a few quid and shake his hand! 190 rears are for hot rods only trust me i'am a doctor.
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Old 01-06-2010, 03:37 PM   #14
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Quote:
Originally Posted by loonytoons View Post
If you have seen any of my videos the guy's I ride with run 180/55/17. They are faster then me through the corners and I ride pretty dam fast. They have never had an issue with traction and run the 180 because the tires are less expensive. the difference in the 180-55-17 and 190-50-17 are minimal at best. Think about Mick Doohan and what he could do on those tires "smaller tire sizes" back in the day. The tires we have now can sustain allot more then most of us can dish out. You will be fine.
It's not about there being more rubber with the 190, because both tire sizes provide enough grip for anybody on this forum. Doohan probably wasn't using a 180 tire on a 6 inch rim. The problem with the 180 on a 6 inch rim is the 180 series tire is designed for a 5.5 inch rim and by mounting it on a 6 inch rim it stretches the tire sideways to match the wider rim. By stretching sideways, the tread contour distorts and becomes flatter. This changes the profile from what it was engineered to be. Think of the difference between a Pilot Power and a Pilot Road tire. Maybe not as dramatic, but that's how the profile changes when it is stretched.

However, if it's cheaper then so be it. People have done it before without crashing or catching on fire so in the long run it doesn't realistically matter. You're just running a tire out of spec but you probably won't notice too much degradation in performance.
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Old 01-20-2010, 10:53 PM   #15
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It's funny, I have had people tell me I should go with the smaller tire on my 1000's as well... saying the bike will turn easier.... I never tired it
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Old 01-20-2010, 11:01 PM   #16
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190/55 nuff said
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Old 01-20-2010, 11:02 PM   #17
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Came across this write up about tire size, thought it was very well written:


-----------------------------------------------------------------------------------


"Recently, I became very curious about the differences and subsequent effects on handling, between the 3 most common sizes of tire available today - 180/55, 190/55 and the 190/50; when mounted on a 6 inch rim.

After much consultation, it became obvious that there were two schools of thought - The pro-180s, and the pro-190s.

I decided to dive into the Internet and other resources to find out as much as I could, so that I could form an educated opinion for myself.

For those that are not aware:

6 inch rear rims are typically found on ALL late model 1000s

5.5 inch rear rims are typically found on ALL late model 600s and some early model 1000s.

If you are not sure, then whip out your tape measure and find out for yourself, you lazy git!

Here goes...

I found this very revealing picture while researching about the pros & cons of a 180/55 tire versus a 190/50 & 190/55, on a 6 inch rim.

What I found validated what some of my most trusted resources divulged to me.

Steering

Firstly, if you compare the 180/55 with the 190/50, you will notice that the center of the 190/50 is very flat, this gives the 190/50 heavier steering from vertical. The 180/55 has a much more pointed profile, giving it quicker steering. (True)

Contact Patch

It is a popular belief that 190/50s are the original fitment size on most modern 1000s from manufacturers, as they put down a bigger contact patch just off the center of the tread, making it slightly safer for a ham-fisted “newbie” riders. However, this has never been officially acknowledged.

As for contact patch at full lean, the 190/50 may well have less of it than a 180/55, because of the way the 190/50 has to curve around the edges near the end of the tire. The 180/55 gives an almost flat contact patch on each side of the tire, due to the taller profile that makes the shoulders “stick out”, giving it it’s typical “triangulated” shape, which is also steeper in terms of angle.

But when comparing the profiles of the 180/55 and the 190/55, I was surprised to see that they were identical! They both have exactly the same profiles. The only difference is that the 190/55 is uniformly taller than the 180/55 all around. So, it may be correct to say that the 190/55 is a copy of the 180/55 with a little bit more rubber across the whole cross section of the tire, to deal with “drive grip”.

Interestingly, the edges of the tire end at almost the same spot for the 180/55 and the 190/55, which in lay-man speak, may indicate that both tires are probably capable of the same maximum lean angle. This may dispel the myth that 180/55s on a 6 inch rim may not allow you to lean over as far as a 190/55.

The only variable here would be the side wall height, how that height contributes to the stiffness and how that stiffness translates to grip.

Ride Height

These are the heights of each size of tire from tallest to shortest:

(Note: Actual measurements may differ from brand to brand)

Ride height is the width of the tire (eg:190), multiplied by the aspect ratio(eg: 55, which is a percentage of the width.)

Formula: For a 190/55 tire, 190mm x 55% = 104.5mm

190/55 104.5 mm

180/55 99 mm

190/50 95 mm

Surprisingly, the 190/50 is the shortest tire among the three.

As for adjusting the ride height, there seems to be no hard or fast rule.

National racers around the world adjust the ride height EVERY SINGLE TIME THEY CHANGE TIRE BRANDS OR SIZES. Their reason is that different sizes of tire affect the geometry of the bike, which can make it behave very differently. Different brands of tire may also not be of the same size; even if it says so, on the sidewall. (This is a fact.)

Other industry professionals say that it is not necessary, as the tire has been made for it to work straight out of the box. An example of this would be when a 190/55 is fitted to an R1 Yamaha. The increase in rear ride height would make the bike flick much easier than before, and may well be intended to work as such.

This leaves us in the middle, so; if it feels fine, it may be better not to fix it! Or, ask someone you trust.

Manufacturer’s Recommendation

Contrary to popular coffeeshop ramblings, a 180/55 is a recommended tire for BOTH 5.5 & 6 inch rims. Dunlop actually supplied 180/55s to a certain magazine when they were performing a group 1000s test. Both are also rated similarly (73W).

However, it is WRONG to put a 190 section tire on a 5.5 inch rim. It distorts the profile and leaves it with a multiple radius.



My Conclusion

For ultimate grip, the 190/55 is a sure winner on paper. It has the handling qualities of the 180/55 with more rubber all around to deal with drive.

However, it does give away a little in terms of weight and also changes the geometry of the bike. Anyone that has ever used a 190/55 can vouch that they are obviously huge tires.

Their size proportionately affects acceleration, braking and cornering negatively due to the added weight.

It's the same as fitting heavier rims, since both rims and tires are considered unsprung weight. Unsprung weight is whatever the suspension does not have to support.

The 180/55 also does increase the rear ride height by 4mm, but it is a small change when compared to a 190/55 which raises it by almost a full centimeter!

The trend as it seems now is to create bigger and bigger contact patches for drive grip on the side of the tyre. This can be done in 2 ways:

1. Reducing the rim size, ala MOTOGP.

(17inch to 16.5 inch and maybe even 16 inches in the future.)

Making the rim smaller creates more space for more rubber, especially on the side.

2. Increasing the aspect ratio.

(Popular for production based racing where rim sizes cannot be changed.)

If you researched race tires, you will be able to find 190 size tires available in slicks with aspect ratios of up tp 70% (190/70)!!

The second method is proving very popular with racers around the world."
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Old 01-20-2010, 11:21 PM   #18
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^^^ excellent info

kinda makes me want to try a 180/55 on my '08 1000rr
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Old 01-21-2010, 12:07 PM   #19
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Good info. One thing is wrong, though. The ride height of the 180/55 is an increase of 8mm and the ride height of the 190/55 is an increase of 19mm (almost an inch) over the stock 190/50 tire (there are two sidewalls to take into consideration when measuring vertically and the tire size gives the sidewall height of only one sidewall).
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Old 01-21-2010, 12:19 PM   #20
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I changed to 190 55 years ago and have not looked back.
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