Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Tire sidewall cracks. Should I worry?

Notices
Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

Tire sidewall cracks. Should I worry?

Old 07-23-16, 04:42 PM
  #1  
cw3k
Newbie
Thread Starter
 
Join Date: Jul 2016
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Tire sidewall cracks. Should I worry?

Hello,

Are these crack bad? The tires hold air pressure just fine. I will be using them to ride around town 10 to 15 miles few times a week. I don't know how old the tires are.

Should I worry about these tires? Are they safe to ride?

Thanks in advanced.







cw3k is offline  
Old 07-23-16, 04:54 PM
  #2  
Papa Tom
Senior Member
 
Papa Tom's Avatar
 
Join Date: Aug 2008
Location: Long Island, New York
Posts: 4,343

Bikes: The same GT Outpost Mountain bike I've been riding since 1996, although I modify it throughout the year for commuting, touring, and recreational riding.

Mentioned: 23 Post(s)
Tagged: 0 Thread(s)
Quoted: 815 Post(s)
Liked 187 Times in 116 Posts
I can't really see the severity of the cracks, but eventually, a crack will separate enough so that a portion of the tube will poke through it. Then, when you hit just the right little bump, the tire will pinch the protruding tube, air will scrrrrrream out of it, and your tire will go instantly flat.

Yes, the tube is holding air, but a large enough crack in the tire will destroy a perfectly good tube in a minute. I say have it checked at your local bike shop to see if you have entered the danger zone with these tires yet.
Papa Tom is offline  
Old 07-23-16, 06:15 PM
  #3  
dsbrantjr
Senior Member
 
dsbrantjr's Avatar
 
Join Date: Sep 2010
Location: Roswell, GA
Posts: 8,055

Bikes: '93 Trek 750, '92 Schwinn Crisscross, '93 Mongoose Alta

Mentioned: 26 Post(s)
Tagged: 0 Thread(s)
Quoted: 1333 Post(s)
Liked 821 Times in 574 Posts
I would not be concerned about superficial cracks like that; the strength of the tire is in the fabric plies, not the rubber covering them.
dsbrantjr is offline  
Old 07-23-16, 06:31 PM
  #4  
10 Wheels
Galveston County Texas
 
10 Wheels's Avatar
 
Join Date: Nov 2007
Location: In The Wind
Posts: 31,862

Bikes: 2010 Catrike Expedition, 02 GTO, 2011 Magnum

Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 999 Post(s)
Liked 481 Times in 242 Posts
Should the tires get worst you can replace them at that time.
__________________
Fred "The Real Fred"

10 Wheels is offline  
Old 07-23-16, 06:54 PM
  #5  
rumrunn6
Senior Member
 
rumrunn6's Avatar
 
Join Date: Jul 2008
Location: 25 miles northwest of Boston
Posts: 24,989

Bikes: Bottecchia Sprint, GT Timberline 29r

Mentioned: 104 Post(s)
Tagged: 0 Thread(s)
Quoted: 3757 Post(s)
Liked 903 Times in 634 Posts
recently rode almost 50 miles on these & they were fine with a littler glue. your cords aren't showing, you should be fine. if they were 30 yrs old, then that dry rot and age would justify changing them. you can always go with 80-90 lbs instead of 100

rumrunn6 is offline  
Old 07-23-16, 09:21 PM
  #6  
JohnDThompson 
Old fart
 
JohnDThompson's Avatar
 
Join Date: Nov 2004
Location: Appleton WI
Posts: 22,546

Bikes: Several, mostly not name brands.

Mentioned: 133 Post(s)
Tagged: 0 Thread(s)
Quoted: 2575 Post(s)
Liked 1,213 Times in 766 Posts
If the cracks extend deep enough to expose the casing you have a potential problem: exposed casing will tend to degrade and eventually allow the inner tube to extrude and burst. Keep an eye on the tire; if it starts to swell, the casing is shot and will fail.
JohnDThompson is offline  
Old 07-24-16, 02:10 AM
  #7  
jfowler85
Senior Member
 
jfowler85's Avatar
 
Join Date: Aug 2009
Location: Zinj
Posts: 1,826

Bikes: '93 911 Turbo 3.6

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 109 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Those little cracks are called crazing...it occurs as the outside environment, most notably the sun's UV energy, break down the chemical composition of the carcass's outermost layer. The tires are most likely fine to ride on; the only crazing that has ever been a problem for me was the 10+ year old tires on a two axle, 12ft trailer which sat in the sun most of its life. Said crazed tires blew out on a stretch of I-15 near Mesquite, NV after about 300 miles of towing over 4000 lbs.
jfowler85 is offline  
Old 07-24-16, 03:33 AM
  #8  
Bike Gremlin
Mostly harmless
 
Bike Gremlin's Avatar
 
Join Date: Nov 2010
Location: Novi Sad
Posts: 4,174

Bikes: Custom made on Scott Speedster frame, Custom made on a 1996. steel MTB frame (all but frame changed at least once in the past 20 years).

Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 994 Post(s)
Liked 45 Times in 30 Posts
The problem is when the tyre fabric, that holds it's shape gets damaged. Sometimes, there are little bulges that come out on sides, like a tyre had swallowed some small ball.

However, if riding on wet, rainy days, water can get through cracked rubber and damage the canvas holding tyre's shape and strength. Then, the tyre can just go boom instantly, without warning.

I rode tyres looking a lot worse than yours. I'd just make sure the front tyre is decent, without cracks, while I'd risk it with the rear.
Bike Gremlin is offline  
Old 07-24-16, 04:42 AM
  #9  
Ball Bearing
Senior Member
 
Join Date: Dec 2013
Location: South Coast of Western Australia
Posts: 254
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 150 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I ride in hilly country and I would not risk dodgy tires. If I have any doubts I change them.
Ball Bearing is offline  
Old 07-24-16, 06:30 AM
  #10  
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Posts: 30,138

Bikes: Catrike 559 I own some others but they don't get ridden very much.

Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 1537 Post(s)
Liked 523 Times in 305 Posts
Originally Posted by Ball Bearing View Post
I ride in hilly country and I would not risk dodgy tires. If I have any doubts I change them.
I can tell you for sure that those tires are NOT going to get better by themselves. Trying to squeeze the last few miles out of a worn out part isn't worth it to me. You know you are going to have to replace those tires sooner or later. If you are worried enough those tires to post it here, why put up with that anxiety every time that you ride for an extra month or so before you ultimately replace them?
__________________
My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.
Retro Grouch is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Andy_K
Commuting
28
04-06-20 06:12 PM
WGB
Bicycle Mechanics
12
08-15-18 08:34 PM
kflorek
Bicycle Mechanics
16
02-24-14 01:43 PM
Surfmonkey
Bicycle Mechanics
7
11-24-13 12:48 PM
Commodus
Commuting
5
02-17-11 08:12 PM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.