front tire chopped
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Joined: Jan 2009
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From: Fairmont, Wv
front tire chopped
09' Nightster, stock shocks, stock forks with 9000 miles. The front tire still looks damn good but it is chopped on both sides. Anybody know what can cause this? I know cars what will cause this but have never seen it on a bike. What is the cure? Fork brace?
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Banned
Joined: Jan 2009
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From: Fairmont, Wv
yes they are cupped,
Tire pressure is fine, I did some research and found that it is kind of like pushing a pencil eraser, the eraser rolls a bit and the front edge wears more than the back edge. So taking turns hard the edges of the grooves on the tire grip while the back edge rolls and does not wear as much, causing the cupping. this is just what I have read and makes since to me.
on another note I do get a wobble while pushing it hard through a turn, which I am told is normal also.
Tire pressure is fine, I did some research and found that it is kind of like pushing a pencil eraser, the eraser rolls a bit and the front edge wears more than the back edge. So taking turns hard the edges of the grooves on the tire grip while the back edge rolls and does not wear as much, causing the cupping. this is just what I have read and makes since to me.
on another note I do get a wobble while pushing it hard through a turn, which I am told is normal also.
Tourer
Joined: Jun 2008
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From: In your closet
There are several different reasons why this happens. First is tire pressure. Second is your forks..when's the last time you had 'em rebuilt? Fork oil does wear out. It thins, and gets full of crud, just like motor oil does. This leads to not only weak damping, but also uneven damping, which can and does cause your tire to cup. Thirdly, if your front end moves around from a loose stem nut. This is kinda rare, as the rider typically notices a clunk before it gets really loose.
Some tires are also more prone to cupping than others, and will eventually cup all by themselves, simply from how a motorcycle front end is set up. 80/20's, or 80% street/29% off road tires, like the ones found on KLR's have basically flat *****, which will cup when the miles start piling up on them. Other tires with similar tread designs will do it as well. Typically high-mileage tires at the cheaper end of the spectrum, but I've seen some 'better' tires do it to.
You'll wanna make sure your tire pressures are set correctly pretty much every time you ride, and if you can't remember the last time your fork oil's been changes, or it's been say a couple of years or over 10k miles(your owner's manual should tell you how often..some bikes have a longer service interval than others).
After that, get some good-wearing tires with linear tread patterns on 'em, and go ride..!
Some tires are also more prone to cupping than others, and will eventually cup all by themselves, simply from how a motorcycle front end is set up. 80/20's, or 80% street/29% off road tires, like the ones found on KLR's have basically flat *****, which will cup when the miles start piling up on them. Other tires with similar tread designs will do it as well. Typically high-mileage tires at the cheaper end of the spectrum, but I've seen some 'better' tires do it to.
You'll wanna make sure your tire pressures are set correctly pretty much every time you ride, and if you can't remember the last time your fork oil's been changes, or it's been say a couple of years or over 10k miles(your owner's manual should tell you how often..some bikes have a longer service interval than others).
After that, get some good-wearing tires with linear tread patterns on 'em, and go ride..!
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