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Old 02-26-2013, 02:22 PM   #1
YOGOI OP
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Bruised tire = hole in the tube "Again"

I just got home from a trip were I had a weird rear flat while running down the highway. The tube looked like it had a wear mark on it kinda like a pinch flat.
The tire's the rear 908, and here is what I found inside.
...and No, I'm not talking about the dime.








So, to back-up a little. Here is a post I started back in 09 when I was having front flats.
http://advrider.com/forums/showthread.php?t=468067

I have a new 908 ready to put on, but WTF. With this tire being $200 I dont want to be having these kind of problems.
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Old 02-26-2013, 07:13 PM   #2
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What kind of tire pressures are you running?
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Old 02-26-2013, 07:20 PM   #3
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34-36 psi
I did have alot of 2up riding on this tire. 3-4 thou in Baja and another 1000 to Death Valley. The lil lady lets me ride pretty fast in rough terrain, and she does a good job of hold'n on. So its been abused, but always at full pressure.
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Old 02-26-2013, 07:23 PM   #4
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Quote:
Originally Posted by traveltoad View Post
What kind of tire pressures are you running?
+1

Never seen that on a 908 rear. I've run a couple to ~4500 miles and they looked okay inside.
I have had that happen on a few 606 fronts. Every time was high mileage tire with a mystery flat after a long highway run.
I always run 30+ psi on or off road.

-M
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Old 02-26-2013, 07:24 PM   #5
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Quote:
Originally Posted by YOGOI View Post
34-36 psi
I did have alot of 2up riding on this tire. 3-4 thou in Baja and another 1000 to Death Valley. The lil lady lets me ride pretty fast in rough terrain, and she does a good job of hold'n on. So its been abused, but always at full pressure.
So you got 4-5,000 out of a rear 908? No wonder I have never seen that before... mine never seem to go much past 2,500-3,000 max.
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Old 02-26-2013, 07:29 PM   #6
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+1


I have had that happen on a few 606 fronts. Every time was high mileage tire with a mystery flat after a long highway run.


-M
+1 did you look at the link on my OP
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Old 02-26-2013, 07:29 PM   #7
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What did you hit to cause that damage to the tyre? Looks like 3 edges close together..

Did your suspension bottom out?

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

How is your suspension set up? When loaded up, what sag do you have?
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Old 02-26-2013, 07:36 PM   #8
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I gone 4500+ miles on a 908RR rear but the last 800 miles were slab marathons enroute home on nearly bald tires. After 3000 they are past their effective off road life but fine for slab. YMMV. Now that they are $200+ I had to stop changing them at 2500 miles
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Old 02-26-2013, 09:17 PM   #9
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Quote:
Originally Posted by Warin View Post
What did you hit to cause that damage to the tyre? Looks like 3 edges close together..

Did your suspension bottom out?

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

How is your suspension set up? When loaded up, what sag do you have?
rear preload cranked to max. 04 "S" had the stiffest rear spring, so what ya gonna do. The suspension set up works pretty good really (for two up). We do bottom out every once in a while. but its on stuff that you should bottom on.

All that is just fluff anyway. I was ok when the 606 front did this. It wasn't meant for this bike. The 908 was made for this bike. and it now costs $200. Its been a bomber tire. I have probably put 50,000 miles on em. I'll give it one more chance. But if they raised the price for a less quality build, I'm out.
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Old 02-27-2013, 12:00 AM   #10
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Just a left field question,, where was the tire made?

Pirelli went through some issues years ago with different assembly techniques between their Spanish and Brazilian manufacturing facilities.

Caused belt failures and poor tread life on their P-Zero line. I found I had to troll the tire shops to find the Spanish versions..

Just something to check...

Dave
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Old 02-27-2013, 07:31 AM   #11
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I have a couple of 606's that are labeled made in Japan and the 908RR's are made in France.
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Old 02-27-2013, 08:21 AM   #12
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Y,
From your 2nd pic, I see the pattern repeating 3 times. I bet if you corellate that to the knobs you will find the separation is in time with the knobs. I have seen similar on other knobs, but not to the point of separation.

Should the pattern corellate with the knobs I believe the explanation would be something like this: localized high loading/flexure of the tire carcass at the knobs by a heavy bike with full load at high speeds and bumps.

As the tire rolls, load is picked up and dropped by the knobs. At certain point the whole load is on only one knob and acts as a concentrated load that effectively about doubles the ground pressure at the knob. So the tire tries to deflect to distribute the load but can only bend so much before it begins to separate after many such rolling cycles at speed and load.

Hope this helps.
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HellsAlien screwed with this post 02-27-2013 at 08:53 AM
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Old 02-27-2013, 12:29 PM   #13
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Quote:
Originally Posted by pdxmotorhead View Post
Just a left field question,, where was the tire made?

Pirelli went through some issues years ago with different assembly techniques between their Spanish and Brazilian manufacturing facilities.

Caused belt failures and poor tread life on their P-Zero line. I found I had to troll the tire shops to find the Spanish versions..

Just something to check...

Dave
I'll have to take a look. Wont be home for a couple of days, so I'll get back to ya.
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Old 02-27-2013, 12:32 PM   #14
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Originally Posted by HellsAlien View Post
Y,
From your 2nd pic, I see the pattern repeating 3 times. I bet if you corellate that to the knobs you will find the separation is in time with the knobs. I have seen similar on other knobs, but not to the point of separation.

Should the pattern corellate with the knobs I believe the explanation would be something like this: localized high loading/flexure of the tire carcass at the knobs by a heavy bike with full load at high speeds and bumps.

As the tire rolls, load is picked up and dropped by the knobs. At certain point the whole load is on only one knob and acts as a concentrated load that effectively about doubles the ground pressure at the knob. So the tire tries to deflect to distribute the load but can only bend so much before it begins to separate after many such rolling cycles at speed and load.

Hope this helps.
Sounds possible. Question is, Is that acceptable? ...and is there a trend? So far I've got the only one, so maybe a fluke.
__________________
Any bike can be taken off road. The question is; How much fun did you have doing it?

04 950 GO!!!!! 2011 250 XC 89 Transalp 69 350 CL 04 225 XT

08 450 XC-F SOLD to a good home
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Old 02-27-2013, 12:40 PM   #15
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Quote:
Originally Posted by YOGOI View Post
...if they raised the price for a less quality build...
Sadly, this wouldn't be surprising

Quote:
Originally Posted by YOGOI View Post
So far I've got the only one, so maybe a fluke.
Hoping so :fingerscrossed

Got one brand new and two half-used 908 rears in the garage.
I'll check their origins when I get home.

-M
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