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Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

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Old 05-21-13, 04:21 PM   #1
ruindd
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Squared off rear tire; when do you retire the tire?

Does anyone have pictures of a squared off rear tire that's ready to be changed?

My rear tire is starting to get pretty squared off, but i'm not sure if it's something I need to worry about yet.
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Old 05-21-13, 04:34 PM   #2
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when you see the cords is the appropriate time. Move front to back and put on a new front. If you find you are flatting easy and often, that's another sign that the tire is toast
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Old 05-21-13, 04:36 PM   #3
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That about sums it up. Another time, is when there is a significant bulge in the sidewall or tread.
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Old 05-21-13, 04:42 PM   #4
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when you see the cords is the appropriate time. Move front to back and put on a new front. If you find you are flatting easy and often, that's another sign that the tire is toast
Squareness in general doesn't matter though?
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Old 05-21-13, 04:44 PM   #5
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Does anyone have pictures of a squared off rear tire that's ready to be changed?

My rear tire is starting to get pretty squared off, but i'm not sure if it's something I need to worry about yet.
What tire are you using, and how many miles do you have on it?

I use Michelin Pro4 race SC tires, and get about 3500 miles out of a rear tire.
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Old 05-21-13, 05:07 PM   #6
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Squareness in general doesn't matter though?
correct.
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Old 05-21-13, 05:29 PM   #7
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Squareness in general doesn't matter though?
But correct inflation does. Over inflation accelerates the squaring off process btw.
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Old 05-21-13, 06:20 PM   #8
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I dont' have the answer, but I don't the the right one is to wait until the cords are showing. I had a friend who at one point started getting repeated flats - not pinch flats, and searching his tire, could never fine a shard or pin. Went on for 3 weeks, at which he averaged 2 flats on every 50 mile ride, so he had literally 6-7 flats in a 3 week period. I helped him change one of those and even I couldn't figure out the cause of the flats. His LBS though took one look at the tire (no cords showing) and said that was the culprit. Sure enough, changed it out, and he was back to flat free. (It was a well used tire but the cords weren't quite showing at any point.)
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Old 05-21-13, 06:32 PM   #9
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I dont' have the answer, but I don't the the right one is to wait until the cords are showing. I had a friend who at one point started getting repeated flats - not pinch flats, and searching his tire, could never fine a shard or pin. Went on for 3 weeks, at which he averaged 2 flats on every 50 mile ride, so he had literally 6-7 flats in a 3 week period. I helped him change one of those and even I couldn't figure out the cause of the flats. His LBS though took one look at the tire (no cords showing) and said that was the culprit. Sure enough, changed it out, and he was back to flat free. (It was a well used tire but the cords weren't quite showing at any point.)
It might seem wasteful, but if i've got a lot of miles and lots of nicks and cuts in a tire...I often change it out after the 2nd flat. I don't flat very often (every 6-9 months) and when I do, it's usually due to a worn out tire.
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Old 05-21-13, 06:45 PM   #10
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I found significant swelling in my back tire after lots o miles. I check mine carefully now.
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Old 05-21-13, 06:46 PM   #11
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It might seem wasteful, but if i've got a lot of miles and lots of nicks and cuts in a tire...I often change it out after the 2nd flat. I don't flat very often (every 6-9 months) and when I do, it's usually due to a worn out tire.
I use 3 sets of tires up per year. Good tires have better casings and will hold up when the tread thins out.
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Old 05-21-13, 06:47 PM   #12
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I found significant swelling in my back tire after lots o miles. I check mine carefully now.
That's casing damage. Replace it.
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Old 05-21-13, 06:53 PM   #13
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when you see the cords is the appropriate time. Move front to back and put on a new front. If you find you are flatting easy and often, that's another sign that the tire is toast
Yes.

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Old 05-21-13, 08:23 PM   #14
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When tread becomes too thin to keep pointy objects from penetrating the tube.

When the flat part ripples when I deflate the tire.
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Old 05-21-13, 08:37 PM   #15
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I dont' have the answer, but I don't the the right one is to wait until the cords are showing. I had a friend who at one point started getting repeated flats - not pinch flats, and searching his tire, could never fine a shard or pin. Went on for 3 weeks, at which he averaged 2 flats on every 50 mile ride, so he had literally 6-7 flats in a 3 week period. I helped him change one of those and even I couldn't figure out the cause of the flats. His LBS though took one look at the tire (no cords showing) and said that was the culprit. Sure enough, changed it out, and he was back to flat free. (It was a well used tire but the cords weren't quite showing at any point.)
There was probably a tiny sharp object stuck inside the tire that was causing new flat. Of course a new tire fixed it. Finding and removing the object would have fixed it too.

I ride down to the cords too.
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Old 05-21-13, 08:38 PM   #16
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Originally Posted by ruindd View Post
Squareness in general doesn't matter though?
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correct.
I pretty much square off my tires and replace them when I get too many flats or when the cords show. I'm a cheap bastitch.
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Old 05-21-13, 08:52 PM   #17
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The thinner the rubber the better.

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Old 05-21-13, 09:24 PM   #18
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^^ Now you can replace them.
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Old 05-21-13, 10:23 PM   #19
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When tread becomes too thin to keep pointy objects from penetrating the tube.

When the flat part ripples when I deflate the tire.
This
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Old 05-21-13, 11:28 PM   #20
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Put the bike in a trainer, get someone on it to turn the cranks and use a razor knife to round out the tire (think lathe). They do this to race car tires to customize them for specific tracks/conditions.
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Old 05-22-13, 03:50 AM   #21
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Put the bike in a trainer, get someone on it to turn the cranks and use a razor knife to round out the tire (think lathe). They do this to race car tires to customize them for specific tracks/conditions.
Yup. Then get a nice rasp file to your frame tubes to make them aero.
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Old 05-22-13, 08:56 AM   #22
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Put the bike in a trainer, get someone on it to turn the cranks and use a razor knife to round out the tire (think lathe). They do this to race car tires to customize them for specific tracks/conditions.
I like this. Use to race RC cars and we would shape our own tires (and groove them).
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Old 05-22-13, 10:07 AM   #23
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To finish off my squares I go to my local roundabout and practice my cornering skills.
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Old 05-22-13, 11:14 AM   #24
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I'm riding squares and also don't replace them till they start getting flats that don't happen when the tires are newer.

I'm curious though, is there any loss of performance riding squared tires???
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Old 05-22-13, 11:43 AM   #25
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I found significant swelling in my back tire after lots o miles. I check mine carefully now.
My riding partner found a significant bulge in his back tire just as we began an 80 mile ride. Luckily we were only a few blocks from his home and he was able to change tires in just a couple minutes. That could have been a potential disaster at high speed.
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