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  1. #1
    mtbr member
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    Bonking ... not feelin' well Jumping Questions.....again + injury story

    Ok, well, a few days ago me and a friend had finished building up a new jump at the bottom of a hill, the jump is about as steep as the typical BMX style jump and about 3-4 ft tall. I was hitting it all day without a problem, my friend tries it for the first time and asks me to let him use my FS (hes got a HT).
    So i said ok, he comes charging down the hill and huts the jump quite fast, (although it seemed like i was hitting it at about the same speed). The he goes up into the air and the bike takes a sharp dive downward, he goes crashing into the hard San Diego clay and hurts himself, some runners tried to call 911 but i told them not to and i rode home and got my car and took him to the hospital. He has a jammed shoulder and a hairline fracture of his forearm (which shouldn't be too serious).
    Anyways that brings me too my question, why did the bike just dive down really hard as soon has he went off the lip. Keep in mind that i ride a size large, and he rides a size med....could this throw him off that much? and why?
    Last edited by RuNDmC1087; 09-05-2005 at 02:30 PM.

  2. #2
    No longer riding a haro!
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    It might be to much rebound in the rear shock. As you preload at the face of the jump, it pops back up and givees you more air. If the rear shock rebounds really fast, it can throw the nose down and the back tire in the air. It also doesnt help that he normally rides a hardtail, he probably wasnt expecting that to happen.
    If you're not living on the edge you're taking up to much space.

  3. #3
    For Those About To Ride
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    u have to pull up...
    no dig no ride...

  4. #4
    e.f.f.e.c.t smoothoperatr
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    ahh, sounds familiar
    did it looks something like this?
    = broken collar bone
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  5. #5
    Meh.
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    A hardtail to a squishie is quite a transition. Lots of differences... Balance, geometry, components, etc.

  6. #6
    e.f.f.e.c.t smoothoperatr
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    Quote Originally Posted by XSL_WiLL
    A hardtail to a squishie is quite a transition. Lots of differences... Balance, geometry, components, etc.


    you still break bones

  7. #7
    Schmeow Productions
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    ususally if the jump is not as long as your wheelbase, or gets really steep really fast, it will kick your back end up. like a spine for the bmxers...

    just make it get steeper more gradually. or make it higher.

    i THINK that's what it is.

  8. #8
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    Quote Originally Posted by freerider167
    didn't preload and the didn't push down and up enough. imo i think he would have been better off with the hardtail cause it has no shock
    it might've helped he was on a fs if the rebound wasn't cranked up....


    anyone remeber seeing kyle strait's crash at crankworx?

  9. #9
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    didn't preload and the didn't push down and up enough. imo i think he would have been better off with the hardtail cause it has no shock

  10. #10
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    Quote Originally Posted by themarsvolta55
    ahh, sounds familiar
    did it looks something like this?
    = broken collar bone

    almost exactly...he pitched the bike higher up tho, i was afried he broke his collar bone

    well about the rebound, i had it cranked up to more oh a DH ing speed, but i had hit the jump on the same bike about 20 times before without having a problem like he did, im thinkin the prolly just wasn;t used to the bike...

    also why would the rebound matter for the jumping part...i can understand for landing but, the shock should be under compression when you hit the jump anyways....

  11. #11
    Meh.
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    Quote Originally Posted by themarsvolta55
    you still break bones
    I wasn't talking about you, or saying anything about bones at all really. I was just saying that he probably got bucked because he wasn't used to the bike.

  12. #12
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    Quote Originally Posted by JBsoxB
    it might've helped he was on a fs if the rebound wasn't cranked up....


    anyone remeber seeing kyle strait's crash at crankworx?
    well his shock might have blown or something, but i can do stuff fine on a fs even with high rebond, you just have to know what your doing. i also crashed like that on a small jump, i wish it were bigger cause then i wouldn't have lnaded on my head. anyways pulling back can definetly help

  13. #13
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    whats with all this rebout and sh!t talk? a good rider could go off that same jump no matter how high or low the reboud is. u just have to pull up. 90% rider 10% bike
    no dig no ride...

  14. #14
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    Quote Originally Posted by Raptordude
    Sounds like you didn't balance the pre-load (Which is why people endo). And it sounds realistic cause he was new on the a FS. You gotta preload evenly that way your bike will spring even, not misfire off the lip and pitch you forward or reverse.

    by balance the preload you mean adjustment of the rear shock with the fork? I think you are on to something because he is about 20-30 lbs heavier than me which would put more weight on the rear causing it to act different that the front. I usually go off the jump going the same speed without a problem...

    also when people say you have to lift up, does that mean shifting your weight back, or letting the jump push the front up while keeping your body orienated the same by letting your arms move...

    thanks for all the responses by the way

  15. #15
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    Sounds like you didn't balance the pre-load (Which is why people endo). And it sounds realistic cause he was new on the a FS. You gotta preload evenly that way your bike will spring even, not misfire off the lip and pitch you forward or reverse.
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  16. #16
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    Quote Originally Posted by RuNDmC1087
    by balance the preload you mean adjustment of the rear shock with the fork?
    i don't think so. i think he means how much YOU preload (pushdown, so the shock/fork pushes back)....

  17. #17
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    preload....
    BUY MY STUFF!!!!!!!!!!!!!!!!!
    - ATOMLAB TRAILPIMP REAR RIM (NEVER USED)..$40

    and thaz pretty much it

  18. #18
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    could it be that he tried to preload and pull up, but he got fvucked up cause hes not used to fs, then with the speed he still managed to get into the air, but with out pullin up he was almost accelerated into the ground?
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  19. #19
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    Quote Originally Posted by JBsoxB
    ususally if the jump is not as long as your wheelbase, or gets really steep really fast, it will kick your back end up. like a spine for the bmxers...

    just make it get steeper more gradually. or make it higher.

    i THINK that's what it is.

    correct plus he needs to preload more for the jump
    the trick is ENJOYING YOUR LIFE EACH DAY, don't waste them away wishing for better days

  20. #20
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    Quote Originally Posted by RuNDmC1087
    by balance the preload you mean adjustment of the rear shock with the fork? I think you are on to something because he is about 20-30 lbs heavier than me which would put more weight on the rear causing it to act different that the front. I usually go off the jump going the same speed without a problem...

    also when people say you have to lift up, does that mean shifting your weight back, or letting the jump push the front up while keeping your body orienated the same by letting your arms move...

    thanks for all the responses by the way
    What I mean is not setting up the bike suspension properly to be even (That should be done before you hit the dirt). I'm talking about preloading your suspension evenly as you launch off the jump. Keep your wieght evenly distributed on the suspension. Compress the front fork and rear wheel evenly so that you spring up fine. A jump with a mega steep lip wont allow to do this (Why people typically have to build bigger jumps for dual suspension).

    If you do NOT preload the suspension evently either wheel will respond at a different time, pitching you off balance at a given moment. Leaning too far back and preloading the rear more than the front will cause the rear to pitch you forward, very far forward right as you launch the ramp.....

    think about it...it makes sense especially sense the guy was fresh on suspension.

    Edit: what I described above is the sole reason why my friend stacked:
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    Last edited by Raptordude; 09-05-2005 at 10:27 PM.
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