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  1. #1
    ed
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    Subjective question (drops to flat)

    I really hate drops to flat, but Kansas isn't known for transitions.

    So I was out doing a little urban session and there's just not a whole lot of "fun terrain" around here. I found a progressive ledge to flat grass and was wondering how big of a drop to flat can I get away with w/o damaging my crap too much?

    This one was 40" to flat and I sucked it up pretty well with my arms/legs and fork. I still had about 10mm of fork travel to spare according to my zip-tie. My wheels are still true and I don't see any signs of stress anywhere.

    I think the weak links could possibly be my pedal spindles Candy C's and rims 5.1d.

    What's the consensus?

  2. #2
    ****** (can I say this?)
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    I've ridden off of loading docks (around 3-3.5 feet) with no issues, and that was with the dart. Well, I guess I did destroy my rear wheel (but that was trying a tail whip to flat), and I think that killed the rebound in my dart, but that was bound to happen. Drops to flat just arent that fun IMO.
    “Speed has never killed anyone, suddenly becoming stationary... that’s what gets you.”- Jeremy Clarkson

  3. #3
    pnj
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    It is subjective. A skilled rider can do less damage then an unskilled rider. Also, going faster can be softer, as the impact is less harsh.
    4130

  4. #4
    Senior Member rankin116's Avatar
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    Quote Originally Posted by pnj View Post
    It is subjective. A skilled rider can do less damage then an unskilled rider. Also, going faster can be softer, as the impact is less harsh.
    Thinking about this from a (very limited, I must admit) physics angle, the velocity forward has no relation to the velocity down. Gravity is gravity, regadless of how fast you are travelling forward.

  5. #5
    one less horse cryptid01's Avatar
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    Quote Originally Posted by rankin116 View Post
    Thinking about this from a (very limited, I must admit) physics angle, the velocity forward has no relation to the velocity down. Gravity is gravity, regadless of how fast you are travelling forward.
    That would be the case if the rider landed instantaneously...but the load is actually distributed over an area delineated in time from when the tires first touch until the rider finishes absorbing the impact. The faster the rider is going, the greater the area the load is spread over resulting in a lower peak load.

    Definitely.
    Last edited by cryptid01; 12-13-08 at 06:55 PM.

  6. #6
    Senior Member rankin116's Avatar
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    Quote Originally Posted by gastro View Post
    That would be the case if the rider landed instantaneously...but the load is actually distributed over an area delineated in time from when the tires first touch until the rider finishes absorbing the impact. The faster the rider is going, the greater the area the load is spread over resulting in a lower peak load.

    Definitely.
    That certainly makes sense. I've definitely felt the difference too, just never was sure why.

    And let me just point out that, yes, I am a nerd.

  7. #7
    Fool O' crap sscyco's Avatar
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    I have done 6 foot drops to flat at ~ 20 mph (on a DH bike) with very little compression - I've also done a 3 foot drop to flat and bottomed - almost no speed wheelie drop. However, I have done ~ 6-7 foot drop at ~ 10 mph (on a 22# ti had tail) with a perfect transition - with barely and compression - Spokanites know this drop as "Rushmore"

  8. #8
    Fool O' crap sscyco's Avatar
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    One more thing - on all my bikes - dh, cx and xc - I run SS eggbeaters - never had a spindle break.

  9. #9
    ed
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    What model beaters?

    How much U weigh?

  10. #10
    Fool O' crap sscyco's Avatar
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    Quote Originally Posted by chelboed View Post
    What model beaters?

    How much U weigh?
    I know them as the Eggbeater SS (stainless steel) I have several sets -

    About 155 (not kilos) soaking wet

  11. #11
    In search of moar cowbell dminor's Avatar
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    Quote Originally Posted by sscyco View Post
    Spokanites know this drop as "Rushmore"
    I have to man up this year and hit Rushmore. No excuse. Now Girthmore on the other hand . . . that sucker looks big from any angle.

  12. #12
    Te mortuo heres tibi sim? scrublover's Avatar
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    Quote Originally Posted by dminor View Post
    i have to man up this year and hit rushmore. No excuse. Now girthmore on the other hand . . . That sucker looks big from any angle.

    ttiwwp!
    I believe the clouds in my coffee more than the weatherman on t.v.

  13. #13
    Old School Rad mtnbiker66's Avatar
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    Drops to flat are the best. The biggest I've ever hit is 22 feet.
    Like a circus monkey on a stolen Harley......

  14. #14
    Fool O' crap sscyco's Avatar
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    Quote Originally Posted by dminor View Post
    I have to man up this year and hit Rushmore. No excuse. Now Girthmore on the other hand . . . that sucker looks big from any angle.
    The first time it's best to follow somone off it - but it really is a nice smooth drop.

  15. #15
    In search of moar cowbell dminor's Avatar
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    Quote Originally Posted by sscyco View Post
    The first time it's best to follow somone off it - but it really is a nice smooth drop.
    That would be good - - would help me gauge my approach speed. Knowing me, otherwise I might overcook the corner. Don't want to do what Robby Johnson did off it.

    Still looking for Rushmore, scrub. In the meantime, here's a local boosting Girthmore. It is bigger than it looks in the pic and run-in is sketchy:



    Rushmore vid:

    [ame="http://profile.myspace.com/index.cfm?fuseaction=vids.individual&VideoID=20752517"]MySpace Video thad doing rushmore by erik[/ame]
    Last edited by dminor; 12-14-08 at 11:33 PM.

  16. #16
    Fool O' crap sscyco's Avatar
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    The first time I dropped Rushmore was on my HT - a week after Robby broke his leg - of course I did not know that until after I did it.

  17. #17
    Official Website Waterboy born2bahick's Avatar
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    Quote Originally Posted by mtnbiker66 View Post
    Drops to flat are the best. The biggest I've ever hit is 22 feet.
    My left tibia snapped in two, just reading that!

  18. #18
    In search of moar cowbell dminor's Avatar
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    Quote Originally Posted by born2bahick View Post
    My left tibia snapped in two, just reading that!
    Pffft! I had to schedule a hip replacement.

  19. #19
    Generic Title ProFail's Avatar
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    Quote Originally Posted by mtnbiker66 View Post
    Drops to flat are the best. The biggest I've ever hit is 22 feet.

    I guess you have to start somewhere. Get good enough and maybe you can ride with me.
    Generic Joke

  20. #20
    Fourth Degree Legend junkyard's Avatar
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    Looking for another go through the warranty process?


    Please note that XC guys know nothing about drops...
    Quote Originally Posted by dminor View Post
    The caveat with a strap-on, of course, is you will have to get creative with a couple of lock cables and an anchor point

  21. #21
    ed
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    Quote Originally Posted by junkyard View Post
    Looking for another go through the warranty process?


    Please note that XC guys know nothing about drops...
    Actually...just the opposite. After much reading...I'm gaining confidence in the durability of this one. My wheelset doesn't come with a warranty though, so that's my concern. (that and the pedal spindles)

    We'll see, I guess. I really do hate drops to flat. There's just not much for drops to tranny in mah'hood.

  22. #22
    In search of moar cowbell dminor's Avatar
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    I realized I never answered your original question, Ed. (So what else is new? - - there were bad jokes to be made and off-topic photos to post).

    I consider 4'-5' to flat to be the limit of abuse I want to heap on parts when I'm just messing around; and the 5-footer should have some speed so that you don't just drop like a rock. But that's just me.

  23. #23
    Lost in the Black Hills mx_599's Avatar
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    Quote Originally Posted by mtnbiker66 View Post
    Drops to flat are the best. The biggest I've ever hit is 22 feet.
    pics?

    mx

  24. #24
    In search of moar cowbell dminor's Avatar
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    Quote Originally Posted by mx_599 View Post
    pics?

    mx

  25. #25
    Fourth Degree Legend junkyard's Avatar
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    Quote Originally Posted by chelboed View Post
    Actually...just the opposite. After much reading...I'm gaining confidence in the durability of this one. My wheelset doesn't come with a warranty though, so that's my concern. (that and the pedal spindles)

    We'll see, I guess. I really do hate drops to flat. There's just not much for drops to tranny in mah'hood.
    I read the last line quickly and saw "tranny" and what I thought was "manhood". I got nervous for you.
    Quote Originally Posted by dminor View Post
    The caveat with a strap-on, of course, is you will have to get creative with a couple of lock cables and an anchor point

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