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Old 01-13-2009, 02:47 PM   #1
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Angry tire cupping wtf!

Anyone know what causes this? Also is it safe to drive on? Went to lock up my bike yesterday and noticed I had a section about 5 inches on the side of the front tire that was scuffed, thought maybe it was from a sharp turn then I looked harder and I noticed the tire was cupped, or scalloped.
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Old 01-13-2009, 02:49 PM   #2
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is it on the left side?
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Old 01-13-2009, 02:52 PM   #3
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Yes it is the left side.
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Old 01-13-2009, 02:52 PM   #4
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if so its prollyy cause you do mainly highway riding and all the highways are slanted for the water to drain so really you ride on the left side of your tire.
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Old 01-13-2009, 02:52 PM   #5
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Some tires are more prone to this than others.
Not checking tire pressure frequently enough is usually to blame
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Old 01-13-2009, 02:52 PM   #6
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Typically indicates a lack of dampening or could be an out of balance wheel/tire. Check the forks if it's on the front or shock on the rear.
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Old 01-13-2009, 02:56 PM   #7
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Quote:
Originally Posted by maxgs View Post
Typically indicates a lack of dampening or could be an out of balance wheel/tire. Check the forks if it's on the front or shock on the rear.
How do I check the dampening? Its on the from the rear is fine.
Also yes I'm guilty to not checking the tire pressure often enough, is it still safe to ride on this tire or should I get a new front tire?
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Old 01-13-2009, 03:02 PM   #8
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Depends on how bad it is and what type of riding
And how picky you are bout these type of things
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Old 01-13-2009, 03:06 PM   #9
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dude im tellin you just about every bike i have seen has this on the front tire and all the tire shops ive been to say what i just said
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Old 01-13-2009, 03:09 PM   #10
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Quote:
Originally Posted by bandito View Post
dude im tellin you just about every bike i have seen has this on the front tire and all the tire shops ive been to say what i just said
Ok but is it still safe to ride on?
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Old 01-13-2009, 03:12 PM   #11
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unless you are seeing cords your still okay. if it bothers you get a new tire.
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Old 01-13-2009, 03:12 PM   #12
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If you are concerned bout it, replace it
better safe than sorry
It will ride much better as well
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Old 01-13-2009, 03:18 PM   #13
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Ehh ill keep riding it haven't noticed any problems and the tire doesn't have many miles on it, it I notice any wobbles I'm gonna change it, thanks for the info on why this happened.
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Old 01-13-2009, 03:28 PM   #14
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Main cause of front tire cupping(particularly the left side) is as mentioned) the crown in the roads here in Texas(the angle/slant). This almost always wears the left side of the tire out faster and makes it cup sooner.... Ofcourse if your getting cupping on the right side of the tire also, then its something else. The next thing to check/repair is the air pressure of the tire. The weight of the bike makes a difference to. I run the exact same tires on my busa and my 1000, I run this both at 36 psi in the front and check them at least once or twice a week and my busa cups a front way before the 1000. Extra weight, softer forks etc. Ofcourse some tires are more susceptable to this then others... I have really good luck with Pilot Powers for anti-cupping...

You can still ride on it but ofcourse its not going to handle as well or be as stable. If the tire gets cupped real bad, it could affect traction in turns. Just have to judge it on a case by case.

I know the old Dunlop D207s and Bridgestone BT010s used to cup like a back in the day...

Best thing to do is check your tires before every ride or at least weekly.
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Old 01-13-2009, 06:52 PM   #15
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I agree w them^^^

I dont think you have alot of mileage on your bike, but dampening, as Curt mentioned from fork oil caused severe cuppling on the second set of dunlops I had on the 600.
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Old 01-13-2009, 06:54 PM   #16
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my dunlops were the worse...
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Old 01-13-2009, 07:14 PM   #17
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Yeah I'm still running the factory dunlops
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Old 01-13-2009, 07:15 PM   #18
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They're designed to do that. If it's excessive, you've got a problem. Take it to a pro.
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Old 01-13-2009, 07:26 PM   #19
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Quote:
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They're designed to do that. If it's excessive, you've got a problem. Take it to a pro.
They are designed to cup? I know on my old 4x4 the fronts cupped cause of the suspension and weight and they told me tires are not supposed to cup, but motorcycles and trucks are completely different, but I would think its not normal
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Old 01-14-2009, 07:45 AM   #20
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Quote:
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They are designed to cup? I know on my old 4x4 the fronts cupped cause of the suspension and weight and they told me tires are not supposed to cup, but motorcycles and trucks are completely different, but I would think its not normal
Mos def, bikes and trucks are different.

There's a really good article written on tire evaluating. I'll try to find it for ya.
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