Odd tire wear issue

moto.monk

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So this is the second tire to do this on both sides. I had my suspension adjusted and new heavier rear spring installed all done by racetech. I called them and the tire is feathering and can be caused by wheel bearing, a final drive issue or low air pressure. I run my tires at 38 and have made no other adjustments.
*edit got a another opinion from a rider and he said it's the bearings. So away to partizilla I go. There 91.67+ tax with the oil seal. Saw the all balls kit for 36+ tax on Amazon but man its has lots of bad reviews from all kinds of different vehicles. 20200720_101905.jpgAny thoughts guys
 
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Sierra1

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Hard to tell in that picture, but it looks like cupping. But, I don't think that I've ever seen cupping on a back tire. Both tires were the same make/model? Maybe an issue with that specific tire.
 

moto.monk

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Hard to tell in that picture, but it looks like cupping. But, I don't think that I've ever seen cupping on a back tire. Both tires were the same make/model? Maybe an issue with that specific tire.
its the rear only and the front is perfect. Same tire road attack 3 and its not cupping if you at lifted edges of the water tread lines you'll see it. I had that on my front old tire but that was due to improper weight balance. Its called feathering and bad wheel bearing that I checked with two sources. im at 54k miles in just under 2 years so makes sense.
 

Kurgan

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Moto, an out of balance tire could also contribute to that issue. I've had that happen to that degree on a motorcycle decades ago and more recently on an SUV where the stick-on wheel weights on the inside of the wheel came off and I drove around like that for thousands of miles until the next tire rotation when it was noticed. Result - a cupped tire.
 

Boris

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I can’t really see what’s going on from that photo, however on post 13906 in the what did you do today thread, I advised of a potential problem with these tyres. Not suggesting that’s the cause, but just maybe something to consider.
 

ballisticexchris

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On a rear tire that is very strange. Just for the heck of it I would check all your swingarm and rear suspension linkage for torque.
 

moto.monk

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Moto, an out of balance tire could also contribute to that issue. I've had that happen to that degree on a motorcycle decades ago and more recently on an SUV where the stick-on wheel weights on the inside of the wheel came off and I drove around like that for thousands of miles until the next tire rotation when it was noticed. Result - a cupped tire.
The all the weights are still on. But is not cupping as you tell by the life rear edge of threads for water evacuation.
 

moto.monk

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On a rear tire that is very strange. Just for the heck of it I would check all your swingarm and rear suspension linkage for torque.
I did torque themselve for the shock install. But I had this same problem before on my last rear tire even before I removed the rear shock
 

cyclemike4

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It is hard to tell in the picture but i have had two Shinko 705 rears do something similar to that. Only on the outside edges of the tire and only after the center was worn flat. You could really feel it in the corners. Other tired i have had no issue with.
 

moto.monk

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I can’t really see what’s going on from that photo, however on post 13906 in the what did you do today thread, I advised of a potential problem with these tyres. Not suggesting that’s the cause, but just maybe something to consider.
I saw the post too many factors to show it was tire company was at fault. My photo show the rear edge of the tire tread higher the front edge. If you look at the very top of the tire and with the bright background it's easier to see the difference.
 

ballisticexchris

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How about the install of the rear wheel? Very easy thing to check is loosen the right axle pinch bolt. If the swing arm moves then the install was tightened out of sequence. And of course check the tire is put on in the right direction....
 

moto.monk

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Checked all the that and triple check the torque for all the bolts and info on here and youtube for tips on taking the wheel off and on. Tire is the right direction and the arm doesn't move. Mostly likely a bad wheel bearing per advice I have gotten
 

Checkswrecks

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There's just one photo, taken so close it is hard to even tell what it is, which way is forward, or how the wear is distributed along the full surface of the tread. Sorry but that is too little to go on.

I will say that I've had several sets of Contis and did not like how any of them wore.
 

jrusell

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I can't tell anything from your photo. Take a picture from the rear of the bike so we can see something.
If what you are experiencing is wear at the tread groove then there are some simple rules that should help you out.

If the leading edge is low and the trailing edge (rear of the groove) is higher then you have too little rebound damping. If the rear of the groove is low and the front is high then you have too much rebound damping.

You mentioned you installed a stiffer spring. A stiffer spring will need more rebound damping to control the energy stored by that spring when you go over bumps. It would make sense you might be experiencing wear on the leading edge if you haven't increased rebound damping when the stiffer spring was installed.

Have someone hold the bike up right while you push hard on the seat and then release. Watch how the rear of the bike responds. If it springs back up rather quickly you need more rebound damping.

As stated post a pic from the rear showing the tread wear and a better guess can be made.
 

Cantab

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What jrusell sez ^^^^^^^^

The RaceTech people will know all about that and other types of wear and help dial that out.

Fairly common on road bikes that are not set up right be it front or rear.
 

Cycledude

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Cupping is very common on both front and rear motorcycle tires.
Your picture taking skills definitely need some attention.
 

Checkswrecks

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I'm sure you see something and think it shows enough for us to understand from the one photo, but the one photo is not enough. My suspicion is that jrusell is on the right path but if you don't have or want to share more then I'd suggest starting with mssafety.org because it's where I go when I have a question and I've cited things from the site here a number of times:

Dan Netting's post at LifeAtLean is also a good tire wear resource: https://lifeatlean.com/motorcycle-tyre-wear-guide/.
 

moto.monk

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The lack of detail orientation is the cause and not seen by all and that's ok. I found the answer thanks yall.
 
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