Continental 4000 grand prix - possible side wall problem

Discussion in 'Cycling Equipment' started by OscarC, Sep 25, 2006.

  1. knonfs

    knonfs New Member

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    And how much mileage\time are you expecting from other tires?

    My tires don't last that long :(
     


  2. dhk2

    dhk2 Active Member

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    I've been getting 2800-3000 miles with the Conti's on the rear, except when I cut a sidewall of course. As you know, the front tread wears really slowly compared to the rear. Have started the practice of putting the new tire on the front and rotating the old one to the back. Would think tire life depends a lot on where and how you ride. I don't race or hammer big gear sprints too often, and do most climbing seated.

    Didn't get as much mileage with the old ProRace I used to run, but that was before ProRace 2 came out. Got away from Michelins due to problems with cuts through the tread; they would pick up small stone chips or glass shards and cut through. Maybe the ProRace 2 have improved puncture resistance, but haven't tried them yet. Have read the Kryliums deliver more mileage at the expense of a slight increase in rolling resistance and perhaps less grip.

    What I'm looking for are low RR race tires with great ride that are puncture-proof and last 5K miles....that doesn't seem so difficult ;)
     
  3. trstaple

    trstaple New Member

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    I purchased a pair of 4000's during the winter and was excited to try them out this year. I only had them on for 2 months until the rear tire had a severe sidewall blowout (the hole was about 3/4 inch). I inspect my tires after every ride and did not notice anything peculiar. I did, however, notice the "fraying" that other people were talking about of the sidewall (I believe that this has nothing to do with the blowout). Also, the day of the blowout, I never noticed running anything over and was careful like usual. Before the blowout, in the 2 months of riding on the 4ooo's, I had 3 flats. All but one were caused by tiny glass shard that got imbedded in the tire. Every one punctured the lining and into the tubes. When I finally threw them out, they looked like they have been through a war. In my opinion, not what you want out of a tire in 2 months. Just to let everyone know, I have been riding on Michelin Krylion Carbons since and have not had a single nick in them (it has been about 3 weeks so knock on wood for me!) Thanks for listening....
     
  4. knonfs

    knonfs New Member

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    I rotate the same tires every couple of months, I adopted the automobile tire rotation theory. I've been able to save quite some money this way :)


    I never used the Pro Race, however you are describing the actual conditions of my Pro Race 2
     
  5. knonfs

    knonfs New Member

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    I haven't seen this blowout problem on my buddys GP4000, I hope I don't experience it on my awaiting to be install GP4000 :(

    BTW - My Buddy is a firm believer of inflating his tires to the max recommended PSI, so his GP4000 are always set to 120psi, even though he tips the scale at 175lbs :eek:
     
  6. dhk2

    dhk2 Active Member

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    High pressures make tires more vunerable to cuts and punctures. Believe Conti quotes max puncture resistance for their tires at 95 psi, although their recommended pressure on the box is 110 (max rating is 120 psi).

    Max pressure is great if you ride on velodromes or glass-smooth roads, but not so good on the roads most of us ride where all you get is reduced grip and a harsh ride.
     
  7. OscarC

    OscarC New Member

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    That the second time I've heard of a blow out on a relatively new GP4000. The first I heard of it was from a guy that worked at the lbs I bought my set of GP4000's at. Kinda scary when blow outs happen, especially if your doing 40+ mph.
     
  8. li rider

    li rider New Member

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    thanks, i will look and see



     
  9. smithsr

    smithsr New Member

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    +1 on the Conti 4000 - love the ride but the sidewall cuts rather than wear terminate the tyre. Giving the new black chilli's a go before I change brands or drop down to a Gatorskin which have much tougher sidewalls.
     
  10. knonfs

    knonfs New Member

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    This is true, however I was stating it because there might be a relation between "recommended" PSI and sidewall problems?
     
  11. dekindy

    dekindy New Member

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    How do you figure that you are saving money?:confused: Or did I miss the sarcasm?:rolleyes:
     
  12. knonfs

    knonfs New Member

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    Don't have to replace the rear tire every 6-8 months, by just rotating them.
     
  13. dekindy

    dekindy New Member

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    Don't you have to replace two tires every 12-16 months then?

    And what about handling problems moving the rear from the front? The rear tire wears differently than the front and not in a way that promotes good handling.

    Everything that I have ever read says to not rotate. Either just replace the rear or move the front to the rear and replace the front.

    I think you are giving bad advice.
     
  14. alienator

    alienator Well-Known Member

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    But you accelerate the wear of what was the front tire.
     
  15. knonfs

    knonfs New Member

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    They will last just a notch longer, in my personal experience.

    I haven't had any handling, or flat problems.

    Everything you have read says NOT to rotate worn tires. What I AM saying is, rotate them every 30-45 days, when they look exactly the same, NOT when you can tell that one is half way through its life cycle, while the other looks brand new.
     
  16. knonfs

    knonfs New Member

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    Yes, I am actually decelerating the rear wear, and accelarating the front one; OR just balancing both tires wear (as I like to think of it :) )
     
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