Had my first flat in my new Conti 4000's this week :
I have about 500 km on them so there only a couple of weeks old. No problem. I Swapped over tubes, and off I went again, but I did notice how loose the tyres were on the rims. ( I easily refitted the tyre without the need for leavers ), but only minutes later the tyre blew off the rim.
Changed a 2nd tube, this time making absolutely sure that the beed was well and truly hooked, but only to get the same result about half an hour later.
Who else has had this sort of issue with keeping tyres on rims, and what have you done to resolve it ?
Note. Im using Conti 4000 tyres 700 x 23mm, Zipp 303 rims, & Vittoria Ultralite tubes 700 x 19/23mm
I've read reports of conti's coming off the rim, usually as a result of hard cornering or braking whilst descending. I'll try and find the link. I've never had an issue with mine and am happy to use and recommend them.
I've used Contis for ages on Ksyriums and RS20s, no problems. Bad batch of tyres, or maybe Zips have slightly different rim profiles?
There was a thread on this a few weeks ago.
RD6 posted various forum links and it seemed to be getting more of a common issue.
google conti 4000s blowouts and you will get plenty of stories.
Seems to be linked to loose fit.
WARNING.. I would not use these tires. I wish I had read the reviews about sidewall blowouts with these tires before buying them. I can tell you they really happen just like other people wrote about. I just happen to be going around a turn when my front tire sidewall failed. This was not the result of a pothole. The tires had about 400 miles on them, the rubber nipples were still on the front tire. After having the gravel cleaned from me, X rays, and stitches, I was cleared to go home from the hospital. Will not buy again.
Hope my bargain ones from Trak are good :)
Try google Frank - you might find a UFO ;)
There are no good reports on Google, its a search engine designed to feed paranoia
btw have you heard the story about Spiros ? not really appropraite for the forums, but apt in this case.
Never had an issue with mine in over 12,000 km using them...but never say never...What pressures do you run Peter. Were the tyres definitely correctly inflated before the first issue? Possible the tyre bead was damaged due to run flat or during refitting, only a kevlar band. Personally it seems to me far more likely a user issue of some description than a Conti quality problem, that is not meant to be getting at you in any way just that there is far more likelyhood of something going wrong in the uncontrolled user environment than in Contis design, development or manufacturing processes...Have you now fitted a new Conti 4000 or something else and how did this new tyre feel during the mounting process compared to the loose fitting one?
Im currently running at 110 psi ( I'm 76-kg )
I immediately blamed myself when the first tyre blew, but inspected both rim and fitment on the second very carefully.
I had the same problem a few years ago using Swarblle (how do yo spell that) Marathon Plus, with loose tyres coming off. These were 700 x 32 on my Cyclo Cross bike. I solved that problem by using under size tubes...
Buy some better quality wheels Pete :)
LOL Gary :)
I Knew I should have gone Tubular ...
Looks to me this is the start of the softening up process on the finance minister - I need new wheels because my tyres keep coming off :)