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  1. #1
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    2 flasts in a day

    I had never got a flat before today. I took my old beat up bike and bunnyhopped a curb and nailed the curb with my rear tire, just lightly, and i got an immediate flat. i figured it was an isolated incident so i got on my nice rocky mountain MTB and rode to the gym. when i got there i bunnyhopped a curb just like the one at home, hit the curb in the same way, and immediattely flatted the tire. i can't imagine it was from the impact cause i nail curbs all the time when riding up them. does anyone know what happened or how i can prevent this in the future (besides bunnyhopping higher)?

  2. #2
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    you pinch flat your tire .i have the same problem when i jump up higher things.
    you can do a few things .
    1st. make sure you have enough pressure in the tire
    2nd. you might want to buy stronger tires
    3rd.buy thicker tubes for dh or thorn resistant
    4th.bunny hop higher

  3. #3
    close to 2000 madbiker555's Avatar
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    Like monkey said, that's a pinch flat and keep a higher PSI.

  4. #4
    THIS BIKE'S 4 U !!!! Killer B's Avatar
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    I always run with 55-60 psi in my tires. NEVER gotten a "pinch" flat in 12 yrs. of riding offroad every other day, year round.... Thorns however are a different story. Hard to avoid them when you can't see 'em.

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    Quote Originally Posted by Killer B
    I always run with 55-60 psi in my tires. NEVER gotten a "pinch" flat in 12 yrs. of riding offroad every other day, year round.... Thorns however are a different story. Hard to avoid them when you can't see 'em.
    well yeah ,
    there aren't usually any sharp edges offroad ether .

  6. #6
    THIS BIKE'S 4 U !!!! Killer B's Avatar
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    Quote Originally Posted by monkey69
    well yeah ,
    there aren't usually any sharp edges offroad ether .
    My bad, you're right. Those sharp rocks, roots, ledges, cliffs, railroad cross tie's, bridges & logs are all just simple safe obstacle's. I suppose no one should really EVER have flats while "offroad", right?

    You're very smart.

  7. #7
    Senior Member CranxOC's Avatar
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    Quote Originally Posted by Killer B
    I always run with 55-60 psi in my tires. NEVER gotten a "pinch" flat in 12 yrs. of riding offroad every other day, year round.... Thorns however are a different story. Hard to avoid them when you can't see 'em.

    55-60 PSI!?!?! That's just nuts! You're robbing yourself of A LOT of plushness and traction by having such an incredibly high tire pressure in there for off-road riding. I regularly run 27 - 32 and the difference in feel between that and 40+ is incredible.

    Sure, tubeless is a requirment for the really low pressures but, you can easily drop that 55 down to 40 -45 and realize some of the advantages.
    "If the facts don't fit the theory, change the facts." - Albert Einstein

  8. #8
    Senior Member CranxOC's Avatar
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    Quote Originally Posted by monkey69
    well yeah ,
    there aren't usually any sharp edges offroad ether .
    Really? Have you ever ridden off-road on anything more than a horse-trail? I think not so you might want to keep your uneducated thoughts to yourself...mmmmmmkay.
    "If the facts don't fit the theory, change the facts." - Albert Einstein

  9. #9
    :\ ping of death troie's Avatar
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    Quote Originally Posted by monkey69
    well yeah ,
    im not usually sharp .
    Really?

  10. #10
    DMN
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    Flats suck.
    I've just gotten back from an hour walk home after getting one and then discovering that I'd left my repair kit at home. Flats suck.
    The views expressed above are badly thought out and hastley typed. Any spelling or gramatical mistakes, are, their to annoy.

  11. #11
    THIS BIKE'S 4 U !!!! Killer B's Avatar
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    Quote Originally Posted by CranxOC
    55-60 PSI!?!?! That's just nuts! You're robbing yourself of A LOT of plushness and traction by having such an incredibly high tire pressure in there for off-road riding. I regularly run 27 - 32 and the difference in feel between that and 40+ is incredible.

    Sure, tubeless is a requirment for the really low pressures but, you can easily drop that 55 down to 40 -45 and realize some of the advantages.
    I have tubeless DeeMax's.... I don't need my tires to provide plushness, that's what my "Zocchi Z-150 SL & Fox Vanilla R suspension is designed for. My HARO has 6" travel F&R. Granted the higher pressure does keep me on my toes flying around corners, but going uphill and just about everywhere else is MUCH faster (and easier) with the 55 psi. Plus, no flats as an added benefit.

  12. #12
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    hey screw you guys ,i been riding trails for over 10 years now on 3 different continents and i have never suffered a pich flat during that time.flats yeah but not pich flats.99.9 % of pich flats happen when you hit horizontal edge like a concrete block straight on .railroad tracks can do that to you but not a log,root or just a sharp rock.they might give you a punture flat but won't pinch if you are running proper psi.

  13. #13
    THIS BIKE'S 4 U !!!! Killer B's Avatar
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    It's called "Pinch" just in case you want to add it to your special little International dictionary, Dude....
    Oh, BTW I've been riding for over 12 yrs., and I've rode in 4 different counties....
    Last edited by Killer B; 05-15-05 at 11:34 AM.

  14. #14
    Killing Rabbits
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    Friendly people.... But at least you answered his question many times. It's a pinch flat, run more pressure than you have been doing. Whatever you have been running put more in! I run hard tires too but closer to 45.

  15. #15
    Senior Member CranxOC's Avatar
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    Quote Originally Posted by Killer B
    I have tubeless DeeMax's.... I don't need my tires to provide plushness, that's what my "Zocchi Z-150 SL & Fox Vanilla R suspension is designed for. My HARO has 6" travel F&R. Granted the higher pressure does keep me on my toes flying around corners, but going uphill and just about everywhere else is MUCH faster (and easier) with the 55 psi. Plus, no flats as an added benefit.
    If you're running Mavics then you REALLY shouldn't be worrying about pinch flats. The whole purpose of tubeless tires is to give the rider the added benefit of lower tire pressure while avoiding pinch flats. The reason this works, especially with the Mavics, is becuse the bead will actually seperate to blow off air where a tube-style wheel will simply snake bite and flat. By pumping your tires up to such extremes (likely higher than the manufacturer's recommended PSI max) you're completely ruining the whole purpose of running tubeless because you absolutely, 100%, without a doubt are losing the added traction you'd gain from running a lower PSI. You might as well have saved yourself some coin by not paying for something you're not going to use.

    Just plain silly.
    "If the facts don't fit the theory, change the facts." - Albert Einstein

  16. #16
    Senior Member CranxOC's Avatar
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    Quote Originally Posted by monkey69
    hey screw you guys ,i been riding trails for over 10 years now on 3 different continents and i have never suffered a pich flat during that time.flats yeah but not pich flats.99.9 % of pich flats happen when you hit horizontal edge like a concrete block straight on .railroad tracks can do that to you but not a log,root or just a sharp rock.they might give you a punture flat but won't pinch if you are running proper psi.
    Really? So all of those pinch flats that hundreds of riders suffer every single day out on the trails are from arbitrary curbs and railroad tracks that randomly run through the middle of their technical singletracks? Wow, I had no idea there were so many curbs out there on the trail; I'm going to have to start looking out for those things.

    99.9%...you really need to stop reaching so far up your rear end with your moronic stats.
    "If the facts don't fit the theory, change the facts." - Albert Einstein

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