If it says 100 psi on the tyre wall, howcome some you guys..

JimmyK
JimmyK Posts: 712
edited April 2008 in Workshop
are stuffing between 110 - 120 psi in there :shock: surely on a steep downhill you are taking a HUGE chance when it comes to blowouts or punctures if you are tearing it up at 35 mph +

Jimmy

Comments

  • aracer
    aracer Posts: 1,649
    Who is - I thought the people running those sort of pressures were using tyres rated for it?

    Anyway, I regularly run the tyres on the tandem at up to 50% over the rated pressure - is the only way to get a decent ride that isn't horribly soft and squidgy when you've got 150kg on the bike. Given tyres are supposedly tested up to twice the rated pressure I don't see it as a huge risk, and we've done thousands of miles like that without a blow-off.
  • NervexProf
    NervexProf Posts: 4,202
    It is my belief that the pressure shown on the sidewall of tyres was the recommended 'minimum pressure' - am I wrong?
    Common sense in an uncommon degree is what the world calls wisdom
  • juggler
    juggler Posts: 262
    side walll of my Race X Lites says 'inflate to 100 - 120 psi' so normally go to 120 psi.
    most tyres i've seem have between 110 and 120 on them, must admit not seen any that do not go over 100.
  • juggler
    juggler Posts: 262
    rechecked actually says inflate to 110 - 120psi :D
  • juggler
    juggler Posts: 262
    maybe i am wrong and thinking too much about car tyres :oops: but is that not telling me i should inflate to between 110 - 120 otherwise it might not be safe?
  • maddog 2
    maddog 2 Posts: 8,114
    I suspect people inflate to 120psi because it makes them feel fast.

    I run a 90 myself. More grip and more comfort that way.
    Facts are meaningless, you can use facts to prove anything that's remotely true! - Homer
  • redddraggon
    redddraggon Posts: 10,862
    maddog 2 wrote:
    I suspect people inflate to 120psi because it makes them feel fast.

    I think its really to do with avoiding snakebite punctures - it is for me anyway.
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  • allaction
    allaction Posts: 209
    I usually ride at 100 psi for comfort, but if I want to 'feal' fast go up to 110!
  • donaldinho
    donaldinho Posts: 103
    redddraggon wrote:
    maddog 2 wrote:
    I suspect people inflate to 120psi because it makes them feel fast.

    I think its really to do with avoiding snakebite punctures - it is for me anyway.

    me too.
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  • graeme_s-2
    graeme_s-2 Posts: 3,382
    As with any technical aspect of cycling worth discussing, Sheldon has an interesting view on this subject:

    http://sheldonbrown.com/tyres.html#pressure

    You have to scroll down a little for the "Pressure Recommendations" heading.
  • Monowai
    Monowai Posts: 329
    My old Vredestein tyres are rated to 160 psi...never tried putting that much in them tho... :?
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  • ddraver
    ddraver Posts: 26,698
    its cool to tell people i run 4 times more pressure in my bike tyres that their car......

    but mine are rated to 120psi and i'm a fat knacker so i run em that hard

    my MTB ones are rated at 55psi and i run them at 38-40psi for more grip
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  • azzerb
    azzerb Posts: 208
    Mine are rated to 145, so i put at around 120, maybe a tad more at times.
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  • cougie
    cougie Posts: 22,512
    Does anyone check what their rims are rated to though ? I think my mavic take less pressure than the Vredestein tyres.
  • Lagavulin
    Lagavulin Posts: 1,688
    cougie wrote:
    Does anyone check what their rims are rated to though?
    To some extent. Not entirely sure what my Aksiums are rated to but my DT's will go to 12 bar (about the same as the Tricomps) but I've never felt the need to go over 125.

    My new bike is coming with a set of Fuclrum 3's and they seem to be only rated to 113psi.
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  • andrewgturnbull
    andrewgturnbull Posts: 3,861
    Graeme_S wrote:
    As with any technical aspect of cycling worth discussing, Sheldon has an interesting view on this subject:

    http://sheldonbrown.com/tyres.html#pressure

    You have to scroll down a little for the "Pressure Recommendations" heading.

    Sheldon advice was pretty much bang-on, as he usually was.
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  • andy_wrx
    andy_wrx Posts: 3,396
    Absolutely !

    Back to the original post, it amazes me people just blindly put the pressure in that it says on the side of the tyre...
  • The The
    The The Posts: 28
    I usually inflate to 100psi at the most, maybe between 90 and 100 on occasion.

    I really can't be bothered to spend any more time pumping them up higher, particularly when they just make the ride more jarring.
  • fossyant
    fossyant Posts: 2,549
    About 110 psi for me. Too little and you will puncture !

    TT'ed at 130-140psi - but that's with tubs.

    If your tyre is going to give way, you will know about it - I had a set, many years ago, and they were worn...blew at about 100PSI - sounded like a gun going off - whilst riding !!

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