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Are these cuts in my tire dangerous? (pics)

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Are these cuts in my tire dangerous? (pics)

Old 08-26-08, 09:20 PM
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Are these cuts in my tire dangerous? (pics)

These are both Continental GP 4000 S. The first tire was on my bike for two weeks before I got that cut. The second tire was the replacement for the first, and was on my bike two weeks before tonight.





Are they safe to ride on? On the weekends I will do some rides where I could hit 40-45 mph. I don't want to ride on them if these cuts make the tire unsafe.

Thanks.
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Old 08-26-08, 09:24 PM
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if the puncture goes thru from the outside to the inside you'll definitely want to replace those.
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Old 08-26-08, 09:39 PM
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i've ridden tires like that for hundreds of miles, but if you hit a piece of glass just right, it will get in that hole and break all the way through to the tube.

i'd at least save 'em for when the world's oil runs out, and bike tire production stops.
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Old 08-26-08, 09:40 PM
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a tire boot should hold those together just fine. Maybe try to glue the hole closed, at least so it does not flap around.
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Old 08-26-08, 09:40 PM
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The PR2 on the rear looks like that. That mother has been through all sorts of hell and is still trucking along. I think you'll be o.k.
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Old 08-26-08, 09:46 PM
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I'd replace 'em. But I hold my health above saving a few bucks.

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Old 08-26-08, 10:12 PM
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Is the risk that the tire will separate? Both of those holes resulted in flats.

I already replaced the first, but having to buy another tire two weeks later is getting a bit pricey. Any recommendations on a tire that might hold up a bit better? I like low rolling resistance and low weight (which is why I picked these tires), and I understand that lighter tires can be more fragile. My friend rides PR2's and has no issues, and he rides over the same stuff I do. Thanks.
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Old 08-26-08, 11:45 PM
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Try a drop of super glue.
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Old 08-26-08, 11:53 PM
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what the hell were you riding through????
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Old 08-27-08, 12:20 AM
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Ride em on the rear only. If they blow, they blow, but at least you don't crash.
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Old 08-27-08, 12:23 AM
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krazy glue.
if it's gone through the casing (ie you can see through the tyre), you can put a patch under it.
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Old 08-27-08, 12:25 AM
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I'd replace them. Why ask for trouble?
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Old 08-27-08, 12:32 AM
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Where did you buy them? If the retailer won't exchange them for a new set, send those pics to Continental. I wouldn't be surprised if they offered a replacement set for free or cheap. Having to possibly scrap two new tires is no fun.
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Old 08-27-08, 05:01 AM
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If I replaced my tires every time I got a nick like yours I'd go bankrupt.

If the tube is not bulging out of the hole, you're fine. Even if minor bulging occurs, booting from the inside will solve that.

To answer your other question: Conti makes a very puncture-resisitant tire called the Gatorskin which I started using on my training rides about 5 months ago. I've gone from flatting about once a month (600 miles a month or so) to zero flats in the last 5 months.

Bob
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Old 08-27-08, 05:18 AM
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superglue & run on back as indicated above. Very effective. Save thin casing segments with the rubber peeled off for boots. The superglue can help hold the slits together.

I generally keep using until chunks of rubber start leaving, but only on the rear!
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Old 08-27-08, 05:20 AM
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Originally Posted by Nachoman View Post
Try a drop of super glue.
+1 - I've gone the Super Glue route before, too. It seems to stop the cut from spreading/cracking more. But, like someone else said, if you hit a sharp rock or something just right on the existing cut, you could have problems.
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Old 08-27-08, 05:42 AM
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I do what many others do, glue with super glue.

In addition I mark the nearest spoke with a tiny piece of tape. This lets me find the cut very quickly so I can monitor often. If glue is holding, no problem. If not, replace the tire.
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Old 08-27-08, 08:09 AM
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Cuts like these are nothing to worry about.

Like cracks in a carbon frame, loose quick-release skewers, unbuckled helmet straps and frayed cables, these kinds of things simply add a heightened sense of excitement while riding, especially on those high-speed descents you spoke of.
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Old 08-27-08, 08:21 AM
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Originally Posted by Booger View Post
Where did you buy them? If the retailer won't exchange them for a new set, send those pics to Continental. I wouldn't be surprised if they offered a replacement set for free or cheap.
Thanks, all. I think I'm going to go back to my previous set of tires (the mondos that came with the bike and that are on my original wheelset) and ride them a bit, then get a new set next year. I like the contis a lot, however they start to get expensive after the fourth one :\
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Old 08-27-08, 08:25 AM
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Originally Posted by Pepper Grinder View Post
Ride em on the rear only. If they blow, they blow, but at least you don't crash.
Originally Posted by Szczuldo View Post
a tire boot should hold those together just fine. Maybe try to glue the hole closed, at least so it does not flap around.
Yup.

If the casing cords are intact, then I'd just run a strip of electrical tape underneath and dust it with talc. Glue the outside cut shut.
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Old 08-27-08, 08:31 AM
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That's nothing.

My P2Rs have several holes larger than that and it's fine. And I ride through a gravel fire road every day. I guess if I hit a sharp rock the right way, it could puncture through the threads. But that's just as likely as glass cutting through a new tire.

I got this sometime during Sunday's century. Didn't notice it until Monday. Could've blown out but it didn't.

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Old 08-27-08, 08:48 AM
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Originally Posted by Molto Lento View Post
Cuts like these are nothing to worry about.

Like cracks in a carbon frame, loose quick-release skewers, unbuckled helmet straps and frayed cables, these kinds of things simply add a heightened sense of excitement while riding, especially on those high-speed descents you spoke of.
LOL
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Old 08-27-08, 05:14 PM
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Here's how I decide. I hold the tire up to a light and if light shines through the hole, the tire is tossed or saved as a spare. If no light, I keep riding it.
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Old 08-27-08, 05:21 PM
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Originally Posted by CastIron View Post
Yup.

If the casing cords are intact, then I'd just run a strip of electrical tape underneath and dust it with talc. Glue the outside cut shut.
Concur.
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Old 08-27-08, 05:39 PM
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Sell them on eBay as brand new.
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