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How do you know when tires should be replaced?

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How do you know when tires should be replaced?

Old 12-27-13, 06:35 PM
  #1  
goldfinch
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How do you know when tires should be replaced?

I have a mountain bike tire that has a fair number of small surface cracks on the sidewall. Should I ditch the tire? Right now I have the one with the most "cracking" on the rear of the bike.
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Old 12-27-13, 06:42 PM
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MTB tire on the rear, not a safety hazard IMO. Replace when it falls apart, or when you start getting flats from things poking through the cracks. This could be a week or a year.

Edit: I forgot about bulges. If it bulges because the threads failed, replace it.

Last edited by FastJake; 12-27-13 at 07:22 PM.
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Old 12-27-13, 06:44 PM
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The cracks you see is from dry riot cause by the sun and being close to things like refrigerators . The tires are fine until you can see the treads when the rubber wear away , then you replace them .
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Old 12-27-13, 07:04 PM
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When the cords show thru in multiple places, and a bulge develops that you cannot overlook while riding, and you're scared to go over 10mph, but luckily you reach a town with one bike shop, but you have don't have enough money for a tire, but you manage to borrow some, but by then the group is long gone,






then you know it's past when tires should be replaced.
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Old 12-27-13, 07:08 PM
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Originally Posted by bikeman715 View Post
The cracks you see is from dry riot cause by the sun and being close to things like refrigerators . The tires are fine until you can see the treads when the rubber wear away , then you replace them .
Minor spelling correction. The treads (actually tread) are the surface cuts, knob, or grooves to improve traction. I gather you meant the threads or fabric body plies under the rubber which give the tire it's strength.

Otherwise, as long as the ire is round with no visible cuts through the body plies, the tire is intact so you can run it until the under tread layer shows through. However on a mtn bike ridden in, sand, mud, grass, or loose dirt, you might have less traction and replace when lost traction coninces you.
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Old 12-27-13, 07:20 PM
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Thanks everyone for the tips. And for being entertaining.
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Old 12-27-13, 07:56 PM
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If it looks like this:
[IMG][/IMG]
Replace it.

Or, if on the inside, it looks like this:
[IMG][/IMG]

Replace it.

Does that help?
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Old 12-27-13, 07:59 PM
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Originally Posted by FBinNY View Post
.... as long as the ire is round
You don't have to get mad about a spelling error.
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Old 12-27-13, 08:03 PM
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Originally Posted by HillRider View Post
You don't have to get mad about a spelling error.
Yeah, very funny
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Old 12-27-13, 09:29 PM
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"Minor spelling correction....give the tire it's strength.

Minor grammatical correction: When you mean it is or it has, use an apostrophe. When you are using its as a possessive, don’t use the apostrophe.
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Old 12-27-13, 09:38 PM
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Originally Posted by woodcraft View Post
When the cords show thru in multiple places, and a bulge develops that you cannot overlook while riding, and you're scared to go over 10mph, but luckily you reach a town with one bike shop, but you have don't have enough money for a tire, but you manage to borrow some, but by then the group is long gone, then you know it's past when tires should be replaced.
Today.
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Old 12-27-13, 09:43 PM
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In my defense, I have as many typos as anybody here, and don't go looking for them. I only posted the correction because both were terms related to tires, so there was the potential for misunderstanding.

I didn't think it was a big deal, and didn't think anybody else would either.
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Old 12-28-13, 07:11 AM
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Grammer and speling is serious biznis on BF. For some, more important than the topic being discussed
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Old 12-28-13, 08:01 AM
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Grammar and spelling are what accurately convey meaning. Sure we can usually guess depending on how badly the language is mangled, but why not get it right? Too lazy, too ignorant, too sloppy, too inconsiderate?
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Old 12-28-13, 08:31 AM
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When to ditch a tyre?

That's pretty simple for me - when the carcass is significantly damaged, or starting to show through the tread.

If you have other criteria, like a high priority on puncture resistance or whatever, maybe the equation is a bit more complicated.
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Old 12-28-13, 08:37 AM
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Originally Posted by dsbrantjr View Post
Minor grammatical correction: When you mean it is or it has, use an apostrophe. When you are using its as a possessive, don’t use the apostrophe.
This here is the best thing I've seen on the subject: https://theoatmeal.com/comics/apostrophe

This is good too: https://theoatmeal.com/comics/misspelling
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Old 12-28-13, 12:41 PM
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Old 12-29-13, 03:39 PM
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Originally Posted by bigfred View Post
If it looks like this:
[IMG][/IMG]
Replace it....

Does that help?
That ain't broke, it just needs Duck (or Duct) tape!

Less facetiously, I have booted tires with inside damage like the second photo and never got around to replacing the tire until the tread finally wore down. I was by then surprised to find the boot in there, still "alive". (I use casing strips cut from old tubular tires.)
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Old 12-29-13, 07:58 PM
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Originally Posted by conspiratemus1 View Post
That ain't broke, it just needs Duck (or Duct) tape!

Less facetiously, I have booted tires with inside damage like the second photo and never got around to replacing the tire until the tread finally wore down. I was by then surprised to find the boot in there, still "alive". (I use casing strips cut from old tubular tires.)
I don't think even duct tape could fix that!

I've used just about everything under the sun as a tire boot at one time or another. However, you'll notice the broken cords in the photo are directing in the contact patch. As tight as I am, I'm not going to endanger myself or those I ride with for the sake of another thousand kilometes out of a tire.
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