So, I've got a Dunlop Qualifier on the rear. This is the 2nd that wore this way. If you were on the WV trip, you might have seen how my Diablo rear wore. I had chalked that up to riding hard 2-up, but the Qualifier is doing the same thing.
Here's a pic, but it's hard to tell. The leading edge of the tread groove is worn almost flat with the bottom of the groove. You can see where it's worn to almost nothing near the point of the blue arrow. This happens on both sides
Now, look at the trailing edge of the groove. It's still almost the height the unworn tire was. It even makes a lip, you can see near the point of the red arrow.
So... What makes my tires wear like this? The Diablo was the same pattern, but even more noticable ~
Pic:
(http://i304.photobucket.com/albums/nn168/the_journeyman/Tire003-1200.jpg)
Thanks!
JM
How many miles on that tire, and what pressure do you run?
About 2000 miles on the tire, 36psi
JM
I've seen that kind of wear, but not to that degree.
Not at all sure why it happens.
I run Bridgestone BT016's at about 38 PSI, they do the same thing, the BT015's did the same and the OEM BT 014's also did it.
I've never understood something with the BT016 rear, after a hard morning of riding up the range, when I get home on the softest part of the tyre there is balled up strips of rubber on the outer most edge of the tyre tread.
Mind you can't complain about the performance, awesome tyres! [bow_down]
Quote from: CairnsDuc on October 22, 2008, 01:21:02 PM
I run Bridgestone BT016's at about 38 PSI, they do the same thing, the BT015's did the same and the OEM BT 014's also did it.
I've never understood something with the BT016 rear, after a hard morning of riding up the range, when I get home on the softest part of the tyre there is balled up strips of rubber on the outer most edge of the tyre tread.
Mind you can't complain about the performance, awesome tyres! [bow_down]
You're joking about not understanding that, right?
And if you're riding that hard, 38 psi is very high.
Sorry, should have specified that better, The other BT's I've had on the Monster never did it at all, now the new Tyre does it a lot. Also helps I have redone the suspension so I am exploring the limits of the tyre a lot more than I ever did/could. very thin chicken strips on my rear tyre! [moto]
Maybe I was riding like a little pregnant dog on the older tyres [cheeky]
I run 38 PSI because the guy who fitted the tyre suggested that because 90%+ of my riding is commuting.
The older BT015 he said liked 36 PSI, but he has found the 016 seems to prefer 38, and after about 2K of riding, so far, they have been an excellent tyre [thumbsup]
JM...
you need more rebound damping
Notice the wear is on the decel side of the tread. I had the same type of wear on my Pilots after a couple track days as I started to ride more aggressively. Figured it was from deceling (letting off the gas) on setup and through the corners. Have you changed your riding style? Does it appear on both side of the tire? Did you do any track days? Maybe the tire rubber is softer on the edges or it was over inflated causing less contact patch?
There's a simple answer to this problem..dunlop qualifiers suck..I had these ony my bike and they did the same thing. I had a pilot power and it never did this. I now I have BT-21's and they dont do it either. My riding style hasnt changed but my tire selection definitely has. Be careful, after a while your rear will destabilze at that location and you'll feel your bike squirm as you enter a turn..
To summarize: Qualifiers SUCK.
Quote from: EEL on October 22, 2008, 05:09:35 PM
There's a simple answer to this problem..dunlop qualifiers suck..I had these ony my bike and they did the same thing. I had a pilot power and it never did this. I now I have BT-21's and they dont do it either. My riding style hasnt changed but my tire selection definitely has. Be careful, after a while your rear will destabilze at that location and you'll feel your bike squirm as you enter a turn..
To summarize: Qualifiers SUCK.
He said his Diablo did it to. So do those suck as well?
Quote from: ducpainter on October 22, 2008, 04:41:09 PM
JM...
you need more rebound damping
And don't think DP said this just for shits and giggles. It is almost like he knows why the tire is wearing like that.
You mean something like this D208?
(http://i32.photobucket.com/albums/d32/Kramer_Krazy/vicki_tire.jpg)
The Dunlops are the absolute worse at doing this out of the tires that my wife and I have run. The Diablos will not do it on this bike....only the Dunslops. The above tire from a 1994 GSX-750R running 36 psi. That tire had less than 300 miles (yes, three hundred) on it when that picture was taken....BTW, that's my wife's damage, not mine. The Dunlop D208 and Qualifiers are the tires we get the absolute worst mileage from......they also tend to slide and give some pretty weird feedback (the Diablos do not). I'll be glad when we burn through the last one (we bought four sets in May when Cycle Gear had them on sale at $159.95 per SET).....the Dunlops don't go well with my 748 nor her R1, either.
Quote from: ducpainter on October 22, 2008, 04:41:09 PM
JM...
you need more rebound damping
Thanks dp!
Ok, so , the only adjustment I have for my stocker is preload. So basically I just need to live with funny tire wear or purchase a new shock with adjustments?
JM
Quote from: the_Journeyman on October 23, 2008, 05:36:28 AM
Thanks dp!
Ok, so , the only adjustment I have for my stocker is preload. So basically I just need to live with funny tire wear or purchase a new shock with adjustments?
JM
no damping adjustment at all? My stocker had rebound...
Quote from: the_Journeyman on October 23, 2008, 05:36:28 AM
Thanks dp!
Ok, so , the only adjustment I have for my stocker is preload. So basically I just need to live with funny tire wear or purchase a new shock with adjustments?
JM
Assuming you have the OEM Sachs shock, there is a rebound adjustment. It is a brass screw on the right side under the lower spring perch with markings S<--------->H. Do keep in mind that the shock may need service or replacement if it is OEM has over about 30K miles on it. If the chrome on the shaft it most likely can be serviced, if the chrome is worn it needs replacement.
I think I remember seeing that brass screw. I'll check into that. The chrome looks nice, so I'll look into servicing it. Is that something my dealer can do or should I rely on an independant suspension shop to work on it? It's got a bit over 30K on it plus I replaced all springs front & rear at about 22K.
I'm assuming more rebound damping would mean turn the screw toward the "H" side? Also, are adjust typically made in 1/2 turn or 1 full turn increments? I'm not so good with the boingers ~
JM
Yes, turning toward H is more.
There are all different theories as to adjustment.
You should figure where you are by turning all the way in either direction.
Then try a 1/2 or full turn more towards H.
On my 996 I went all the way to H and worked towards S
Quote from: ducpainter on October 23, 2008, 06:56:29 AM
You should figure where you are by turning all the way in either direction.
Don't forget to count the clicks, it's more precise that way ;)
Some dealers will service them, some wont. If you service the old one consider a re valve and linear spring for your weight also. Do price new after market shocks, like Ohlins an Penske since you will be spending a lot dollar wise anyway.
Quote from: IdZer0 on October 23, 2008, 06:59:40 AM
Don't forget to count the clicks, it's more precise that way ;)
Not sure all the stockers 'click'
The Öhlins does.
Quote from: ducpainter on October 23, 2008, 08:22:05 AM
Not sure all the stockers 'click'
The Öhlins does.
They click, but it is barely perceptible. Base setting is turn all the way to hard (clockwiese), then back off 8 clicks.
Quote from: howie on October 23, 2008, 08:39:02 AM
They click, but it is barely perceptible. Base setting is turn all the way to hard (clockwiese), then back off 8 clicks.
Hmmm..
I couldn't feel any clicks on my 996.
I'll check again.
Let me throw this out:
Any other models have better rear shocks that would fit an M750? I could easily put my spring on a different, new shock of a bike that's been wadded up for pretty cheap that might not be as worn out as my stock shock. Anything you folks know of?
Mine's a '99 M750
JM
Quote from: ducpainter on October 23, 2008, 08:22:05 AM
Not sure all the stockers 'click'
The Öhlins does.
The stocker on my 695 clicks. But indeed it isn't a real click, more a little dimple you come across.
DP, what's the reasoning behind the more rebound damping for this wear?
Quote from: IdZer0 on October 23, 2008, 11:24:11 AM
The stocker on my 695 clicks. But indeed it isn't a real click, more a little dimple you come across.
DP, what's the reasoning behind the more rebound damping for this wear?
Keep in mind...
I'm no expert...
but I listen and the suspender guys say when the rubber 'piles' up on the trailing edge of a sipe and the leading edge is gone away it needs more rebound.
Too much rebound will show as weird arc in between sipes.
Tire pressure is also critical because the tire is an integral part of the suspension.
Keep in mind I destroyed a track tire because I had too much pressure in it.
How much?...hard telling.
The gurus say Michelins are sensitive to 1/2 pound and I had mine set to recommended pressure...at noon.
The temp rose a bit during the afternoon and I was instructing so I didn't have the opportunity to adjust it as the day went on.
That's why suspension tuning can be viewed as black magic. ;)
sachs shock adjusters click. showa superbikes ones don't. i forget about the ss ones. 888 frame based monsters all use the same shock, except the 900 special which had showa or ohlins. 888 shocks go straight in. i haven't investigated whether the later ones fit or not, but i'd think the damping rates would probably be wrong given the different style of linkage.
i've seen tyre wear like that based on riding styles - the difference between high corner speed on a trailing throttle versus driving thru corners under power sort of thing. one wears the leading edge, the other the trailing.
Wow, lots of great advice here. Amazing what a simple question about tire wear will garner. I just got a new Ohlins rear for my monster, and will a lot of fun playing with that come spring. It's too cold here now to do any real suspension setup. The road surface is always cold enough to make traction marginal anyways.
Anyways, just my .02: I switched over to Michelin Pilots a few years ago, and I know some people complain about them, and their lifecycle is shorter than some, but since then I haven't had any funny wear patterns, other than wearing more in the center from commuting too much.