That looks more like a cut to me than a split. Peice of metal or something. Have seen that before on a car tire that ran over a piece of scrap metal. Splits are usually straight.
to the op...I had the same sort of cracks (all around center of the tread in the grooves) on the front tire on my old softail ...it was a dunlop though....I had the tire replaced and dunlop paid me for the remaining life of the bad tire....so, I would check with the manufacturer about their warranty....
Here's an older style michelin commander that has aprox 3k on it...... just got back from a ride with the last hundred miles on the highway at 80mph i was wiping down the bike and just looking things over before putting the bike away. I've never seen a tire split in the tread like this, especially with that little mileage. I liked these tires, they run well and the wear WAS good.... be safe out there folks and take nothing for granted, never assume anything, inspect your tires regularly!
Looks just like the crack I found on the front tire of my last metric a couple years ago. I (thought) I was keeping an eye on the tires and more worried about the back as it was getting pretty slick. Washed the bike after a ride and found a split about 4 inches long right down the bottom of the tread. Only rode it about a half mile to get to the closest dealer (took a zuke to a yama dealer) once I found it and had both replaced.
Imagine my suprise to find this thread! I just took a trip from this weekend (Friday - Saturday, May 5th and 6th 2012) Leaving Omaha to Kansas City and returning. On the way down no problems, but on the way back I picked up a vibration that was getting worse. We stopped and while checking tires I found that the rear tire (Mich MT90B16) has cracks all the way around the tire. Where yours are opposite of the tread, mine are with the line of tread. I think this is too much of a concidence to ignore. The cracks were not there when I did my pretrip inspection, including air pressure. My bike is a 06 Electra Glide, I was riding solo and packing light with only a backpack and sleeping bag as cargo so I was not over weight. My front tire is also a Commander and put on at the same time. Both were done last year, about 6K ago, and no I did not hit or run over anything.
These were taken with my phone, but you get the idea.
DJ, if you look at the edges of the cut, you'll see they are jagged like it was torn. Also, see how the cut skips the very leading edge of the tread block? Both indicate the tire was rubbing while it was spinning, either a seat bolt as mentioned, or road debris that hopped up there. I handle maintenance on a small fleet of trucks and see a bunch of tire damage. Cracking like the OP had will head for the space between the tread blocks where the rubber is thinner and weaker, therefore more likely to flex.
In any case the OP should contact Michelin and send them pics of the tire. Ain't like they are giving the things away and the safety factor goes without saying. Was riding with a buddy a few months ago and noticed his front Avon was dry rotted on the sidewall. He never called about it but I sure would.
...looks like your rear seat fastner is rubbing your tire...possibly when you are two-up and loaded with luggage. I had that to happen riding two-up on a RK that was lowered and too long of a seat bolt...
Here's an older style michelin commander that has aprox 3k on it...... just got back from a ride with the last hundred miles on the highway at 80mph i was wiping down the bike and just looking things over before putting the bike away. I've never seen a tire split in the tread like this, especially with that little mileage. I liked these tires, they run well and the wear WAS good.... be safe out there folks and take nothing for granted, never assume anything, inspect your tires regularly!
It's called channel cracking. Typically a result of maybe too much carbon black in the mix or a hard spot in the compound. Tyipically this should be an adjustable condition of workmanship or material. But, knowing Michelin's normal stance of "we don't make a defective tire" I would say good luck on getting them to stand behind it. That being said, you may find a retailer take a chance on getting it adjusted. Keep in mind your going to pay for the amount of tread used. So if the tire has say 5/32nds of non skid remaining, and it comes with 8/32nds, you have used 3/32nds of the available 7/32nds (you can't use all 8/32nds as the tire is legally worn out at 1/32nd). FYI auto and light truck tires are worn out at 2/32nds.
My Dunlops are doing that only in several spots around the tire inside the tread. Rear needs to be replaced anyways, but still. Kind of sucks seeing that.
From: Beautiful SW Missouri Ozark Mountain Country
Originally Posted by Rickl
It's called channel cracking. Typically a result of maybe too much carbon black in the mix or a hard spot in the compound. Tyipically this should be an adjustable condition of workmanship or material.
I have also seen truck tires crack like this when they hit curbs and whatnot too hard.
Originally Posted by Rickl
But, knowing Michelin's normal stance of "we don't make a defective tire" I would say good luck on getting them to stand behind it.
That is their position now and has been for at least 25 years way back when my living was the tire industry.
The other picture is definitely something that draged on the tire for several miles. Better check your tire to fender clearance.