How to weigh your motorcycle

Discussion in 'Thumpers' started by Kbike, Oct 10, 2008.

  1. Kbike

    Kbike Mountain Adventurer

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    An easy way to get a fairly accurate weight is grab your bathroom scale, don't tell the wife, and roll the rear wheel up on it, then the front, and add the two weights for the total. To protect the scale use a 2x6 to roll the bike up on first, then onto the scale.
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    My KLR weighs 230 on the rear
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    and 185 on the front for a total of 415, and my WR450 is 259 total. Close enough for anything I need to do.
    #1
  2. Lumpyboy

    Lumpyboy Adventurer

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    ? No way that will be close to accurate -- one tire on the scale and one on the ground, and then switching. Simply too much weight in the middle of the bike will be unaccounted for.

    Better way is to put your scale on top of a lift stand or jack and then lift the entire bike up on the stand.
    #2
  3. Hodakaguy

    Hodakaguy NorthWest Adventure Rider

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    It will work, with good accuracy. They weight big trucks and aircraft like this all the time.

    Hodakaguy
    #3
  4. threadkiller

    threadkiller Long timer

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    LMAO!!!!!
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  5. webhank

    webhank Adventurer

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    i like to weigh myself on the bathroom scale and take note of my weight - then pick up the bike, hold it over my head, take note of that weight, then subtract my weight from the combined weight of me and the bike.

    i am wicked strong.

    Sorry, couldn't resist.

    You could also go to a materials yard, around here they have them for landscaping materials etc - they have large drive on scales that will weigh the whole bike at once.
    #5
  6. jeiff

    jeiff Been here awhile

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    So where would the "weight in the middle" be borne when both wheels are on the ground?

    Kbike's method works. But the wheel that is not on the scale should probably be leveled up to the scale height for better accuracy.

    Joe
    #6
  7. Hamon

    Hamon I just like riding

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    Man, don't you get it? The problem with this method is you have all the weight of the tires, wheels, and suspension underneath the horizontal line that is the top of the scale that will never get weighed..

    Some people think they're physics majors or something..













    :hide
    #7
  8. JDLuke

    JDLuke Ravening for delight

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    Sheesh, if you're THAT concerned about accuracy, just do a stoppie that comes to rest on the scale.

    It takes a little practice.
    #8
  9. Lumpyboy

    Lumpyboy Adventurer

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    The one scale method usually isn't that accurate b/c people are not careful enough to make sure that the weight of each end of the bike is transmitted to the middle of the scale and not the edge of the scale as each end is weighed (the comment above about leveling up is important). That was my point. Only accurate way to do it is to slip the scale onto your bike stand. And in addition, bathroom scales are often not accurate if that's what your using. Best to use a shipping or medical scale.
    #9
  10. plugeye

    plugeye mc caregiver

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    thats like weighing yourself one foot at a time & adding it up
    i'm under 20 lbs
    #10
  11. Dolly Sod

    Dolly Sod I want to do right, but not right now

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    no it isn't. You can controll how much weight you put on one foot by shifting your body. The bike can't, it's a rigid system. This method is accurate, even without leveling the other end. The amount of weight shifted by being out of level that little bit is negligible.

    Bathroom scales are accurate enough for this. Just make sure the wheel is in the center of the scale. If it's accurate enough to weigh you, it's accurate enough to weigh a bike.

    Many bathroom scales have a 250-300lb max though, so if you think the bike will weigh over 550lbs or so, I would suggest trying another method.
    #11
  12. dentvet

    dentvet Long timer

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    this is fun.

    1. two bikes weigh 300# each, one is a short cruiser, one is a tall dirt bike. lay them both over and put the handlebar end on the bathroom scale. Which is heavier, which is easier to pick up?

    2. put a sealed box with a pound of flies on your luggage rack. Start the engine to disturb them, making them all fly around inside the box. weigh bike. As the flies die and fall to the bottom of the box, does the bike get heavier or lighter?


    not trying to hijack a thread with a good description of a handy technique. sorry

    (I'm thinking the handlebar weight might actually be a useful piece of info):D
    #12
  13. Ruffus

    Ruffus Dirty Old Mudder

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    #13
  14. Dolly Sod

    Dolly Sod I want to do right, but not right now

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    What do you know about leverage?:deal
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  15. Dolly Sod

    Dolly Sod I want to do right, but not right now

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    As sealed box will stay the same weight. A box with a mesh floor and lid will get heavier as the flies die.

    :norton
    #15
  16. johnnyandjebus

    johnnyandjebus Been here awhile

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    This was a problem brought before me & my fellow students in grade nine, only it was a cargo van full of 1000 pounds worth of chickens. At the weight station, the driver would get out & beat the sides of the van with a club, causing the chickens to fly around so he could cheat the scales. So did it weigh less? LMAO

    Yes it would.

    What does LMAO stand for? I am old and out of touch with the lingo the kids are throw'n around these days.

    Here is another physics problem for you.

    A propeller driven plane is sitting on a tread mill. if it fires up its engines and tries to take off will it? Keep in mind that the faster the wheels turn in one direction the tread mill will spin in the opposite direction.

    Short answer, IMHO, yes it will.


    Kbike sorry for high jack'n your thread, I am going to try your method this weekend.


    p.s If high jack'n this thread is out of line, let me know and I will delete my post. Not try'n to piss anyone off, but as someone already said
    This is fun :lol3:lol3
    #16
  17. wolfhoundaddy

    wolfhoundaddy Been here awhile

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    I took mine to the local can recycler. Just fit on the scale. 219 lbs for a honda reflex.
    #17
  18. Dolly Sod

    Dolly Sod I want to do right, but not right now

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    To quell the naysayers, perhaps you should try the one scale method to see if you get something close..


    There's an episode of Mythbusters that you need to catch..
    #18
  19. Kbike

    Kbike Mountain Adventurer

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    If I was paying by the lb to ship my bike I would get an accurate weigh-in somewhere. All I want to know is what my bike weighs compared to the published specs, and if I'm going to be able to pick the SOB up. :lol3
    #19
  20. johnnyandjebus

    johnnyandjebus Been here awhile

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    There's an episode of Mythbusters that you need to catch..

    gramps given that kbike doesn't seem to be to piss'ed about me post'n off topic...

    So does the van weigh less or not? I don't have cable tv so mythbusters is out of my reach. I ask because my fellow work-mates have grown to put up with my left field physics questions like the chickens in the van scenario and I would like to have a concrete answer for them on Monday morning.

    kbike.. it has been my experience that the longer the ride the heavier the bike gets when you try to pick it up, regardless of what the bathroom scales read. And yes I have plenty of experience in pick'n bikes up.
    #20