New tyre headaches (GP4000's)

DLH1985
DLH1985 Posts: 56
edited August 2008 in Workshop
Hi there, bought a new set of GP4000's from CRC this week to replace my old pair, which were looking worn but had nevertheless been extremely hard wearing. After many swear words getting the new tyres on the rim (in the end I left them in the sun for an hour to stretch) I pumped the tubes up, but at around 80psi the tyres already felt rock solid. Went out for a 2hr ride and had a flat about 1/2 way round. Went out yesterday and again suffered a flat! Still, the tyres are feeling solid well below the pressure I used to run my old pair at (approx 110psi), is this just a usual bedding in period for the tyres or something else? I've checked the rims and can't see or feel anything which would cause both F&R tyres to top out at 80psi.

Any help would be greatly appreciated

Comments

  • Nuggs
    Nuggs Posts: 1,804
    Can't help I'm afraid, but I will be extra cautious as I have just fitted a pair of GP4000S (bloody difficult isn't it!) - first ride today...
  • NWLondoner
    NWLondoner Posts: 2,047
    The recommended PSI for these tyres is 110 PSI.


    I've done 40 miles in them and NO P's
  • redddraggon
    redddraggon Posts: 10,862
    Of course the tyres feel rock solid at 80psi, I think in H&S that's already classed as a high pressure, but keep pumping, 100psi should be fine if you aren't too heavy.
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  • billybiker
    billybiker Posts: 272
    I'm not sure I understand this thread. I've used these tyres for a while and can fit them with my hands and at 110psi I've yet to suffer any *********. Is the rim tape OK? Have you checked the valve holes for rough edges?
    www.withamwheelers.co.uk
  • ellieb
    ellieb Posts: 436
    I'd agree with the above. I run mine at 110psi & they were the easiest tyres I've ever had to get on to the rim :D
  • redddraggon
    redddraggon Posts: 10,862
    ellieb wrote:
    they were the easiest tyres I've ever had to get on to the rim :D

    The ease of fitting tyres is more to do with the rim rather than the tyre. I've fitted GP4000s to Shimano wheels with ease, but it was a battle to fit them on Campag wheels.

    So personal experience of fitting them on unnamed wheelset is useless......perhaps he's (OP) got campag wheels.
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  • ellieb
    ellieb Posts: 436
    Not that I want to start anything, but it can't just be the rims otherwise the OP would be saying that every set of tyres he has is a pain to fit :wink:

    I'm prepared to admit that some rims can be difficult, and that certain batches of tyres can be tight, but if you look through the sorry history of these types of posts the only thing you can say for certain is that some combinations of tyre/rims seem to be hard, but that it may also be down to the individuals tyre technique. Given that over the years I have sometimes found it easy & sometimes impossibly hardv to fit a tyre I have reluctantly come to the conclusion that nobody knows why it happens, IT JUST DOES :x
  • jhop
    jhop Posts: 369
    I have used the 4000's since they came in and before them the 3000's and on my Open Pro and Campag Eurus rims / wheels have found them extremely easy to put on and take off .
    I tend to run them at pressures just over 100 psi.
    I rate them as an excellent tyre but find their major weakness to be rather rapid wear and weak side walls particularly when compared to my winter bikes which are equipped with Conti Gator Skins and 4 Seasons which have the weakness of not being very grippy in the wet which for winter tyres is a major drawback.
    Which rims / wheels seem difficult when matched with the 4000's ?
  • coco2
    coco2 Posts: 44
    No problems here either. Had them on for three months now and running them at 115 psi... lets see what the sunday run brings...
  • dombo6
    dombo6 Posts: 582
    I run these at 100-110 psi on Easton EA90 SLX wheels and can get them on by hand. Done Dragon Ride, Etape (in the wet) and several 50-100 mile club runs with no problems. They are soft though and do cut easily, but fixable with superglue.
  • johnbirkby46213
    johnbirkby46213 Posts: 399
    ellieb wrote:
    Not that I want to start anything, but it can't just be the rims otherwise the OP would be saying that every set of tyres he has is a pain to fit :wink:

    I'm prepared to admit that some rims can be difficult, and that certain batches of tyres can be tight, but if you look through the sorry history of these types of posts the only thing you can say for certain is that some combinations of tyre/rims seem to be hard, but that it may also be down to the individuals tyre technique. Given that over the years I have sometimes found it easy & sometimes impossibly hardv to fit a tyre I have reluctantly come to the conclusion that nobody knows why it happens, IT JUST DOES :x

    That as maybe but my spech tyres were a doddle to fit by hand on my Ultegra rims. 4000s were an absolute swine to fit on the same rims. No complaints about the tyres other than that tho' and won't be swapping back to the spech tyres anytime soon
    2 minute grovels can sometimes be a lot longer..tho' shorter on a lighter bike :-)

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  • cougie
    cougie Posts: 22,512
    My 4000s are great on my mavic rims - no probs. The continental mchanic reccomended not to go over 100 psi - and they ride really well like that. I've not had the 'p' thing with them in two years. Great tyres.
  • Nuggs
    Nuggs Posts: 1,804
    Fitting the 4000s onto my Open Pros was a huge pain - it took me hours!
  • billybiker
    billybiker Posts: 272
    cougie wrote:
    My 4000s are great on my mavic rims - no probs. The continental mchanic reccomended not to go over 100 psi - and they ride really well like that. I've not had the 'p' thing with them in two years. Great tyres.
    The guide you get with the tyres says use 110psi but I guess if its very hot you should use less.
    www.withamwheelers.co.uk

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