Author Topic: Parts weight  (Read 25029 times)

PiBoSo

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Parts weight
« on: February 05, 2015, 04:08:05 PM »
While waiting for MX Bikes to be more refined and contact manufacturers for a collaboration, we need some data to improve realism.

Does anyone know the weight of the swingarm of a MX bike? Or the weight of the front forks + handlebar + springs + dampers + oil?
Even a rough estimate would be of great help, thank you.
Hopefully someone has some spare parts around to weight  :)

PizzaChet

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Re: Parts weight
« Reply #1 on: February 05, 2015, 05:41:40 PM »
Or the weight of the...oil?
"... per gallon. Oil is 6.84 lbs."

Phathry25

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Re: Parts weight
« Reply #2 on: February 05, 2015, 07:57:58 PM »
I could go through my bike at let you know. Have been meaning to anyways. Is that all you're looking for?  Or everything?

PiBoSo

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Re: Parts weight
« Reply #3 on: February 05, 2015, 08:29:24 PM »
I could go through my bike at let you know. Have been meaning to anyways. Is that all you're looking for?  Or everything?

Thank you.
The more the better  :)

motopsycho87

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Re: Parts weight
« Reply #4 on: February 05, 2015, 08:31:45 PM »
I don't have anything particularly accurate at home to measure with, but;

CBR600F1 rear shock, inc oil and spring, non piggyback type read 3.3kg. It is fatter than the shock on my dirt bike, but not as long, and the dirt bike has piggyback reservoir. So shouldn't be too far off...  :o

GasGas EC300 Fork springs (0.46 & 0.48 combined as a 0.47 pair) weighed roughly 1kg (as pair).

I used 630ml (approx) oil (dexron 6, equiv to 7.5wt) in my forks after last rebuild to get 110mm height. Datasheet states density of 0.848g/cm^3, so 0.848*625=534g per fork leg.
(Manual states 610ml for 90mm air gap, doesn't make sense that less is more, but I assume 610ml takes you to the bottom of the adjustable range, and 90 is factory standard... or I measured wrong...).
« Last Edit: February 06, 2015, 06:14:26 AM by motopsycho87 »

motopsycho87

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Re: Parts weight
« Reply #5 on: February 05, 2015, 08:41:24 PM »
Ok, I've put in the information of my spring into this calculator and it assumes the weight of each spring to be approx 0.543kg, which coincides with my 'roughly 1kg' measurement.

http://www.acxesspring.com/spring-calculator.html

  Spring Rate (or Spring constant), k :   4.813 N/mm
  Diameter of spring wire, d:   5.000 mm
  Outer diameter of spring, Douter :   40.000 mm
  Free length of spring, Lfree :   475.000 mm
  Number of active coils, na :   30
  Number of total coils, nT :   32

These are springs fitted to a GasGas EC300 2 stroke 2006 model with Marzocchi Shiver 45 forks. Just measured the diameter and counted the coils on the 0.48.

Excerpt from Marzocchi Shiver owners manual re: spring rates.


Overall complete bike with handlebar brush guards, sump plate, heavy mx tyres, full tank of fuel and with oils weighed at approx 120kg.
« Last Edit: February 05, 2015, 09:02:30 PM by motopsycho87 »

motopsycho87

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Re: Parts weight
« Reply #6 on: February 05, 2015, 09:01:04 PM »
Pro taper state their MX handlebars weigh 975g, though these are adjustable stiffness?

http://www.protaper.com/products/handlebars/fuzion

Hope this all helps!
« Last Edit: February 05, 2015, 09:02:43 PM by motopsycho87 »

PiBoSo

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Re: Parts weight
« Reply #7 on: February 07, 2015, 03:16:46 PM »
Bump!

Anyone with a spare swingarm or forks + handlebars to weight?

GDUBMX

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Re: Parts weight
« Reply #8 on: February 07, 2015, 06:07:41 PM »
Renthal Carmichael bend twinwall bars weigh 1.3kg
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22Ryann

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Re: Parts weight
« Reply #9 on: February 08, 2015, 08:57:49 AM »
I can probably get you stock 2015 KX250f header pipe and silencer weights if that is useful to you PiBoSo??

PiBoSo

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Re: Parts weight
« Reply #10 on: February 08, 2015, 11:00:45 AM »
I can probably get you stock 2015 KX250f header pipe and silencer weights if that is useful to you PiBoSo??

It wouldn't be of much use, unfortunately. Thank you anyway.
Now that springs, oil and bars weight is known, if would be great to know the weight of forks + triple clamps, and of course dampers.
It would also be extremely useful to know the weight of the front fender and number plate.

22Ryann

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Re: Parts weight
« Reply #11 on: February 08, 2015, 11:59:40 AM »
I believe i still have stock 2011 triple clamps here for a KX250f? Maybe also fender and plate, ill check it out tomorrow.
« Last Edit: February 08, 2015, 12:02:32 PM by 22Ryann »

GDUBMX

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Re: Parts weight
« Reply #12 on: February 08, 2015, 01:48:47 PM »
Just a thought, I don't have time to do it though.

Couldn't you get on a stock parts site, pick the bike you want, then add whatever part to the cart, then calculate shipping (look at estimated weight), and repeat, lol.

Just a thought.

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PiBoSo

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Re: Parts weight
« Reply #13 on: February 08, 2015, 03:14:49 PM »
Just a thought, I don't have time to do it though.

Couldn't you get on a stock parts site, pick the bike you want, then add whatever part to the cart, then calculate shipping (look at estimated weight), and repeat, lol.

Just a thought.

Do you know a good website that sells stock parts?
It probably wouldn't be very accurate, though, because of the packaging.
But maybe they already list the weights.

motopsycho87

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Re: Parts weight
« Reply #14 on: February 08, 2015, 08:54:44 PM »
I've never come across a dealer that calculates postage by weight, normally a set price from 1g to 20kg.

I'd imagine those bars I listed are heavier than normal as they are adjustable stiffness, but not by much.

Front muddy I'd estimate at between 400 and 600 grams, number board probably 200 to 300. Couldn't really guess the forks as a whole tbh  :-[

Good luck, :D can't wait to play the new beta