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Michelin Pilot Road II Cupping?


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#1 CharlesW

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Posted 01 September 2011 - 08:16 AM

Yeah, I know, :beatdeadhorse:
The problem is that I didn't find much in the way of an answer when I did a search.
Comments like Dunlops cause cupping didn't help me much with my Michelins.

I don't have excessive wear and the cupping is not such that it upsets the handling of the bike as of yet, but it is evident when looking closely at the tire.

Some background:
1. 2004 VFR 800, 31,800 miles
2. Tires were professionally installed and balanced the first week of June, 2011
3. 7,000 miles on them and the rear appears to be good for at least another 4 to 5 thousand miles
4. I had thought the front tire was going to be good for several thousand beyond that, but with the cupping, I think I will probably replace them as a set
5. Tire pressure is maintained regularly at 36 F, 42 R per the owner's manual
6. The cupping seems to be only on the front and only on the left side. Actual wear seems to be about equal on both sides, but the right side doesn't show any cupping (Yet)
7. I am not really an aggressive rider and while I do take some corners at speed, it's usually the RH corners that I push the most on
8. I am quite happy with the PR2s overall and the cupping came as somewhat of a surprise

To the point.
Can I be doing something that is contributing to the cupping?
Can I do something to help avoid it? (Please don't tell me to slow down)
Charles

#2 y2kvfr

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Posted 01 September 2011 - 09:05 AM

Perhaps the crown of the road is affecting it? My rear is definitely more worn on the left side (only got 4.5k miles out of the PR2 rear)

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#3 dude

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Posted 01 September 2011 - 09:09 AM

I know i'll get flack from the michelin guys but after encountering cupping on 2 different sets of michelins , i switched to metzler and have never had cupping again. Thats my experience anyway . I think Metz use a steel band and michelin doesnt which could account for something?

#4 2thdr

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Posted 01 September 2011 - 09:09 AM

I don't think 7k miles is necessarily bad service from a tire! Especially if you live in an area with more abrasive asphalt/concrete products. The VFR is no lightweight...
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#5 Baileyrock

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Posted 01 September 2011 - 09:15 AM

Wierd, I've run no less than 25 Sets of Michelins over 60,000 miles on my VFR and have never had one cup on me! :blush:
There was only one PR2 front though.

Not sure what to think about your issue.

BR

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#6 CornerCarver

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Posted 01 September 2011 - 09:21 AM

Do you notice any headshake on decel with your hands off the bars?

Try once without touching any brakes and again while touching the footbrake only.

I know that with the cupping being visible now that it may contribute to some instability on decel with no hands on hte bars but I am wondering if you may have some front bearing or brake pad wear issue.


and I would consider 7k from a tire on a VFR as a job well done.
 
 

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#7 Monk

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Posted 01 September 2011 - 09:52 AM

Iowa Is one of the highest crowned roads I been on(I-80 at least)...That being said, it is usually the left turns that cause the wear on the left side of the tyre(not the crown, at least not where the tyre shows the wear, that would have to be a lot of angle in the crown to wear it that far over on the tyre). As for the Tyre it self the pattern will cause wear on some more than others, the more the lines of the pattern run with the tyre as opposed to crossing the tyre the more the cupping will happen. As you go around a turn the forces that pull the bike to the side cause the edge of the pattern(sypes) to grip, in so doing comes the wear(cupping). That's My Opinion, and I'm sticking to it.

I,ve been running PR2's (3rd set) and getting 8 to 10 on the front, and about 8 on the rear.

I was runnig PR's before and wasn't getting much if any cupping, just like the PR2's better for grip(thanks in part to the cupping) and longer wear.

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#8 CharlesW

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Posted 01 September 2011 - 11:25 AM

Perhaps the crown of the road is affecting it? My rear is definitely more worn on the left side (only got 4.5k miles out of the PR2 rear)

It is probably a factor, but I'm not really concerned about wear. I don't have noticeably more wear on the left side of the front or rear tire. The cupping was what I was surprised by.


I know i'll get flack from the michelin guys but after encountering cupping on 2 different sets of michelins , i switched to metzler and have never had cupping again. Thats my experience anyway . I think Metz use a steel band and michelin doesnt which could account for something?

Interesting. I seemed to be the only one I noticed experiencing the problem with Michelins.
I bought the bike used and replaced Michelin Pilot Roads and I didn't notice any cupping with them. I only rode the Pilot Roads about 4,000 miles before putting on the Pilot Road IIs and I have no idea as to how the previous owner rode or maintained his tires. The bike was immaculate so I don't think he abused it.


I don't think 7k miles is necessarily bad service from a tire! Especially if you live in an area with more abrasive asphalt/concrete products. The VFR is no lightweight...

I have no complaints as to tire wear. I just was surprised to see the cupping.



Wierd, I've run no less than 25 Sets of Michelins over 60,000 miles on my VFR and have never had one cup on me! :blush:
There was only one PR2 front though.

Not sure what to think about your issue.

BR

I'm not sure what to think, either.


Do you notice any headshake on decel with your hands off the bars?

Try once without touching any brakes and again while touching the footbrake only.

I know that with the cupping being visible now that it may contribute to some instability on decel with no hands on hte bars but I am wondering if you may have some front bearing or brake pad wear issue.


and I would consider 7k from a tire on a VFR as a job well done.

No deceleration headshake, but I have never applied the brake at that time. I'm not sure just how the linked brakes would affect that test. Have to try it.
No front end play and the brakes were checked when the tires were installed. The shop did replace the front pads at that time. Could be related, but I'm not sure just how.
As I have said before, no complaints on tire wear, just concern about the cupping.

Iowa Is one of the highest crowned roads I been on(I-80 at least)...That being said, it is usually the left turns that cause the wear on the left side of the tyre(not the crown, at least not where the tyre shows the wear, that would have to be a lot of angle in the crown to wear it that far over on the tyre). As for the Tyre it self the pattern will cause wear on some more than others, the more the lines of the pattern run with the tyre as opposed to crossing the tyre the more the cupping will happen. As you go around a turn the forces that pull the bike to the side cause the edge of the pattern(sypes) to grip, in so doing comes the wear(cupping). That's My Opinion, and I'm sticking to it.

I,ve been running PR2's (3rd set) and getting 8 to 10 on the front, and about 8 on the rear.

I was runnig PR's before and wasn't getting much if any cupping, just like the PR2's better for grip(thanks in part to the cupping) and longer wear.

I very seldom ride the interstate any distance, but many of our roads have high crowns. That's one reason I take RH corners faster. The crown contributes a small amount of banking on right handers and actually gives a negative camber on left handers. The negative camber and the idiots that cross the centerline keep my speed down on left handers unless I can see quite some distance ahead.
I have heard/read your theory about the load variance causing cupping. I think it was BusyLittle Shop that mentioned it in another thread.
It makes sense and the camber/banking for RH turns may be reducing the load enough that I'm not getting cupping on the right side. (Yet)
My chickenstrips are about 10 to 12 mm on both sides and I almost never touch a foot peg feeler.

Interesting discussion. For me, anyway. :fing02:
Charles

#9 Switchblade

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Posted 01 September 2011 - 11:31 AM

Speed up !!!!!!!!!!! Your braking to hard ..
:laughing6-hehe::laughing6-hehe::laughing6-hehe::laughing6-hehe::laughing6-hehe::laughing6-hehe::laughing6-hehe:

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#10 CharlesW

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Posted 01 September 2011 - 11:38 AM

Speed up !!!!!!!!!!! Your braking to hard ..
:laughing6-hehe::laughing6-hehe::laughing6-hehe::laughing6-hehe::laughing6-hehe::laughing6-hehe::laughing6-hehe:

If you are serious, wouldn't heavy braking show up in the center of the tread? I don't do much braking in the corners.

If you are joking, :biggrin:
Charles




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