Go Back  Bike Forums > Bike Forums > Road Cycling
Reload this Page >

What's Up with Conti Tires Blowing Sidewalls?

Notices
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

What's Up with Conti Tires Blowing Sidewalls?

Old 07-08-20, 08:12 PM
  #1  
danallen
Member
Thread Starter
 
danallen's Avatar
 
Join Date: Sep 2018
Posts: 47
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 18 Post(s)
Liked 2 Times in 2 Posts
What's Up with Conti Tires Blowing Sidewalls?





I have had no trouble on Continental 4000 Grand Prix Sii tires. However, was just reading tire reviews on Continental 5000 Grand Prix and Gator Skins, and there is recurring pattern of tires blowing sidewalls or beads, while still almost new. Not everybody, but not just one guy either.

The people say they have been riding for years without this happening.

What say you?

Faulty tires a certain percentage of the time?

Hit something they didn't know they hit?

Installed wrong?

There has to be a reason. Is there a best likely guess?

Last edited by danallen; 07-08-20 at 08:18 PM.
danallen is offline  
Old 07-08-20, 08:26 PM
  #2  
rubiksoval
Senior Member
 
Join Date: Nov 2015
Location: Music City, USA
Posts: 3,441

Bikes: Felt AR

Mentioned: 49 Post(s)
Tagged: 0 Thread(s)
Quoted: 2015 Post(s)
Liked 519 Times in 251 Posts
The 1st picture and the 2nd picture are two different things. I've never seen or heard of anyone I know experiencing the second.
rubiksoval is offline  
Likes For rubiksoval:
Old 07-08-20, 09:19 PM
  #3  
Carbonfiberboy 
just another gosling
 
Carbonfiberboy's Avatar
 
Join Date: Feb 2007
Location: Everett, WA
Posts: 16,398

Bikes: CoMo Speedster 2003, Trek 5200, CAAD 9, Fred 2004

Mentioned: 101 Post(s)
Tagged: 0 Thread(s)
Quoted: 2403 Post(s)
Liked 478 Times in 352 Posts
The 4000 and 5000 have similar sidewalls and I expect about the same vulnerability. I really try not to hit the sides of sharp rocks about the size of golf balls. I'll use both until my 4000's run out. Our tandem came with Gatorskins. I took them off after the first couple of rides. Incredibly slow tires.

I've had sidewalls cut like in the first photo on several tire brands, but never saw or heard about anything like the second photo - other than on the web of course. Ah, of course: brake pads were set too high, wore through. Rim probably had a wobble in it. That's the reason I've never seen anything like it.
__________________
Results matter
Carbonfiberboy is offline  
Likes For Carbonfiberboy:
Old 07-09-20, 02:14 AM
  #4  
znomit
Zoom zoom zoom zoom bonk
 
znomit's Avatar
 
Join Date: Sep 2006
Location: New Zealand
Posts: 4,032

Bikes: Giant Defy, Trek 1.7c, BMC GF02, Fuji Tahoe, Scott Sub 35

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 289 Post(s)
Liked 231 Times in 120 Posts
Originally Posted by Carbonfiberboy View Post
Ah, of course: brake pads were set too high, wore through. Rim probably had a wobble in it. That's the reason I've never seen anything like it.
Guilty.
Two mystery rear flats after a 100km rainy downhill towards the end of a 400.

I have abused my GP4000s in many ways. Gravel roads tend to make the reflex strips come away. No sidewall cuts.
znomit is online now  
Old 07-09-20, 02:27 AM
  #5  
canklecat
Me duelen las nalgas
 
canklecat's Avatar
 
Join Date: Aug 2015
Location: Texas
Posts: 11,400

Bikes: Centurion Ironman, Trek 5900, Univega Via Carisma, Globe Carmel

Mentioned: 183 Post(s)
Tagged: 0 Thread(s)
Quoted: 3626 Post(s)
Liked 1,159 Times in 768 Posts
Dunno, I have thousands of miles on Conti Grand Prix Classic skinwalls and their low cost Ultra Sport II, no problems. Few punctures in three years and no sidewall failures. After a year on the Grand Prix Classics (with only a single flat, snakebite from running over a rock) I may switch to those completely. My only gripe about the Ultra Sport II was the fit was so tight I needed a Kool Stop bead jack to mount them. No problems mounting the GP Classics by hand.
canklecat is offline  
Old 07-09-20, 04:33 AM
  #6  
Bah Humbug
runner
 
Bah Humbug's Avatar
 
Join Date: Apr 2009
Location: Austin
Posts: 15,819

Bikes: S1, R2, P2

Mentioned: 115 Post(s)
Tagged: 1 Thread(s)
Quoted: 5633 Post(s)
Liked 1,367 Times in 741 Posts
It was claimed on the 4000S as well, even before it was the SII, so it's not new. They have thin sidewalls; inspect regularly and use fresh ones when it's important. Or do what I do and run tires with bead-to-bead Kevlar for training.
Bah Humbug is offline  
Old 07-09-20, 04:41 AM
  #7  
Germanrazor
Senior Member
 
Join Date: Nov 2019
Posts: 236

Bikes: Trek Madone

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 87 Post(s)
Liked 63 Times in 46 Posts
I have not seen or experienced this. I don’t doubt it happens, just not heard of it widespread in my area.
Germanrazor is offline  
Old 07-09-20, 08:40 AM
  #8  
Ogsarg
Senior Member
 
Join Date: Feb 2017
Location: Hollister, CA (not the surf town)
Posts: 1,052

Bikes: 2019 Specialized Roubaix Comp Di2, 2009 Roubaix, early 90's Giant Iguana

Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 403 Post(s)
Liked 472 Times in 202 Posts
If a product has any weakness, no matter how slight, it will be magnified 1000X on the internet.
Ogsarg is offline  
Likes For Ogsarg:
Old 07-09-20, 08:52 AM
  #9  
Aladin
Senior Member
 
Aladin's Avatar
 
Join Date: Sep 2014
Location: Siberia West .. aka Central Wisconsin... USA
Posts: 235

Bikes: 2000 Litespeed Appalachian, 1998 Litespeed BlueRidge.. 1977? Schwinn LeTour 12.2 'Rain Daze'

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 37 Post(s)
Likes: 0
Liked 9 Times in 8 Posts
Originally Posted by Ogsarg View Post
If a product has any weakness, no matter how slight, it will be magnified 1000X on the internet.

LMFAO... Homerun. Exactly.

It NEVER has anything to do w user abuse... etc... . NEVER a case of running said rubber at 120 psi's and above on HOT days on HOT asphalt.. which means psi goes waaaayyy ... up.
Aladin is offline  
Likes For Aladin:
Old 07-09-20, 08:53 AM
  #10  
friday1970
Senior Member
 
friday1970's Avatar
 
Join Date: Sep 2012
Location: Brighton, Michigan
Posts: 476

Bikes: Optima Baron LR, '14 Nishiki Maricopa,'87 Trek 330 Elance, '89 Miyata 1400, '85 Peugeot PGN10, '04 Fuji Ace, '06 Giant Rincon, '95 Giant Allegre, '83 Trek 620, '86 Schwinn High Sierra

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 159 Post(s)
Liked 61 Times in 41 Posts
I've seen one sidewall of a GP 4000 SII being blown out. It was a tour out of Fenton MI, if I recall correctly. A female cyclist had to make a call of shame when her sidewall blew out.
I've got three sets of GP 4000's and a single GP 5000 set across 4 bikes. No problems on any of those, minus the occasion shard of glass flat.
friday1970 is offline  
Likes For friday1970:
Old 07-09-20, 09:25 AM
  #11  
mercator
In the wind
 
mercator's Avatar
 
Join Date: Aug 2006
Location: Calgary AB
Posts: 1,255

Bikes: Giant TCR Advanced Team, Lemond Buenos Aires, Giant TCX, Miyata 1000LT

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 151 Post(s)
Liked 40 Times in 21 Posts
I had a pair of GP4000s fail similarly to the second photo - bead separated from the tire. Put me off Continental for a while but I assume it was a manufacturing defect that affected only a few batches.
mercator is offline  
Old 07-09-20, 06:37 PM
  #12  
tankist
Senior Member
 
Join Date: Oct 2006
Posts: 59
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 30 Post(s)
Liked 23 Times in 13 Posts
I cut my back wheel GP5000 similar to the first photo after riding over a freshly broken bottle. I don't think the tire was defective.
tankist is offline  
Old 07-09-20, 07:38 PM
  #13  
MSchott
Senior Member
 
Join Date: Jul 2008
Location: Farmington Hills, MI
Posts: 363

Bikes: 2017 Specialized Roubaix Sport SL4

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 88 Post(s)
Liked 39 Times in 29 Posts
Originally Posted by Germanrazor View Post
I have not seen or experienced this. I don’t doubt it happens, just not heard of it widespread in my area.
Agree. GP4000's have been my go to tire for years and have proven to me to be smooth and very reliable. The last flat I had was a pinch flat. My current tires are 23mm models that I bought a few years ago prior to the trend towards wider rubber. I'm 200 pounds and ride them at 80-85 PSI.
MSchott is offline  
Old 07-10-20, 07:07 AM
  #14  
Aladin
Senior Member
 
Aladin's Avatar
 
Join Date: Sep 2014
Location: Siberia West .. aka Central Wisconsin... USA
Posts: 235

Bikes: 2000 Litespeed Appalachian, 1998 Litespeed BlueRidge.. 1977? Schwinn LeTour 12.2 'Rain Daze'

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 37 Post(s)
Likes: 0
Liked 9 Times in 8 Posts
Originally Posted by MSchott View Post
Agree. GP4000's have been my go to tire for years and have proven to me to be smooth and very reliable. The last flat I had was a pinch flat. My current tires are 23mm models that I bought a few years ago prior to the trend towards wider rubber. I'm 200 pounds and ride them at 80-85 PSI.
And that underlines the main advantage of tubeass.. I've run them down to ~ 10 psi getting home for repairs. I do not normally run seal-NOTS.. which some flavors work fine for that task.. if one monitors they 'dry state' closely.

I use the worms mostly for TL repairs. No tire removal.. easy.

Have at times.. used Super Glue gel.. sets up quick.. as it's setting I push it into the hole recess w side of tool. Has worked well few times I've done this. Some write of using rubber like cement for repairs.. drying time though prevents fast repair.
Aladin is offline  
Old 07-10-20, 07:25 AM
  #15  
Rides4Beer
Senior Member
 
Join Date: Oct 2018
Location: SC
Posts: 1,076

Bikes: Defy | Revolt

Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
Quoted: 556 Post(s)
Liked 456 Times in 258 Posts
The first pic looks like they ran over something sharp, any tire would have probably gotten cut. No idea what happened in the second pic. Most of the pics I've seen of "sidewall issues" look more like "people not paying attention" issues and running over debris.

I've had multiple sets of 4000s and 5000s and have never had a sidewall issue. I've had one tire damaged from hitting a big pothole, but I'm pretty sure that would have happened to any tire (a lot of people probably would have kept riding on that tire, only had a small hole in the sidewall, but I like my teeth so I scrapped it).
Rides4Beer is offline  
Old 07-11-20, 11:43 AM
  #16  
Psimet2001 
I eat carbide.
 
Psimet2001's Avatar
 
Join Date: Jan 2006
Location: Elgin, IL
Posts: 20,822

Bikes: Lots. Van Dessel and Squid Dealer

Mentioned: 24 Post(s)
Tagged: 0 Thread(s)
Quoted: 764 Post(s)
Liked 228 Times in 117 Posts
I've had a lot of customers with 5000's who have tire failures rapidly after putting a new one on. I always remark how almost everyone seems to have one with these. Then they bring them in and I can tell they ran over something and cut them. *shrug*

At this point I won't say that I think the 5000's are garbage. Honestly I see so many likely because there are so many people riding them as the internet has no tolerance for more than one go to tire for performance. Personally I have thought top Conti tires are complete crap and have been for a long time. I had hopes for the 5000 as the compound is more like what others have had for a while (vittoria, Pirelli, Michelin) so they are softer and give a better road feel. I am now not as hopeful and I will continue to ride whatever else is a top tire. (Except Schwalbe...seen too many complete weird failures with them and inconsistencies)
__________________
PSIMET Wheels, PSIMET Racing, PSIMET Neutral Race Support, and 11 Jackson Coffee
Podcast - YouTube Channel
Video about PSIMET Wheels

Psimet2001 is offline  
Old 07-11-20, 12:04 PM
  #17  
Voodoo76
Blast from the Past
 
Voodoo76's Avatar
 
Join Date: Mar 2005
Location: Schertz TX
Posts: 3,143

Bikes: Ridley Excal, CAAD10, CAAD12, Felt DA, Dolan

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 187 Post(s)
Liked 32 Times in 26 Posts
I've had one GP4000 failure that was a good 3" long separation at the bead a few years ago. Rear tire, at the time about half a season on it. No major impact or anything, started feeling a bump in the tire immediately followed by a blow out in dramatic fashion. I've ridden many miles on 4K's and a set of GP-TT's since then, as I had a few pairs on the shelf. But I'm going to try Vittoria or Michelin after this last set is worn out.
Voodoo76 is offline  
Old 07-11-20, 01:41 PM
  #18  
sfrider 
Asleep at the bars
 
sfrider's Avatar
 
Join Date: May 2006
Location: San Francisco, CA
Posts: 1,500
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 134 Post(s)
Liked 107 Times in 68 Posts
Definitely keep them away from large debris like rocks. I've had 4000's (though never 5000's) "herniated" where there is marginal sidewall damage, just enough for a bulge. I consider that a complete loss and I replace the tire. It tends only to be older fairly worn tires that are susceptible to this though, and I know it's because I'm careless with them. I tried a set of Michelin Pro Race 3, maybe 10 years ago or so, and had a 2" rip in the sidewall on the first ride. Had no idea if it was something I did to them (most likely) or a manufacturing defect (remotely plausible). I replaced them with GP3000's (so it probably was more than 10 years ago) and if something works I'll just stick with it. One nice aspect of riding a popular tire is eventually I can stock up when a bargain manifests itself. The 5000 TL is probably a bit too new for this, but one of these years they will be available at half off or something - and I'll nab a 5 year supply.
sfrider is offline  

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 © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.