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Old 10-24-2014, 03:01 AM   #1
chasbmw OP
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Weight distribution, front wheel/ back wheel

Any one know what the weight distribution between front wheel and a back wheel on a twin shock airhead? Ideally on a 90/6??
Bike weighs 218KG 1/2 tank with tools.

Many thanks
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Old 10-24-2014, 06:58 AM   #2
pommie john
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It's quite easy to weigh a bike just with bathroom scales.

Pop the scales under one wheel and put a bit of wood under the other that's about the same thickness as the scales. Swap and repeat. You just need a friend to hold the bike upright.

Probably quicker than waiting for a reply here :)
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Old 10-24-2014, 08:00 AM   #3
chasbmw OP
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Thanks PJ, but my scales are not built for 300ib super trucks!
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Old 10-24-2014, 08:53 AM   #4
cjbecker
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You will only be getting roughly half the weight of the bike on the scale.
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Old 10-24-2014, 08:53 AM   #5
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I'm curious about this as well. Many of the typical weight reducing modifications (exhaust, single seat, lithium battery) take weight off the back.

Stock on the center stand: front wheel up. After a round of mods: rear wheel up.
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Old 10-24-2014, 09:41 AM   #6
trials
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Don't know about the airheads but most off-road machines I have had are neutral or close to it - 50/50 to 60/40 rear heavier without rider.
Suspension plays a really big part here especially when the rider get on....rider stance, handlebar bar height, foot peg location, and power delivery are just some of the factors and then how or what is the bike used for...
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Old 10-24-2014, 10:32 AM   #7
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CafeDude screwed with this post 10-24-2014 at 11:24 AM
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Old 10-24-2014, 11:18 AM   #8
Airhead Wrangler
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When I weighed mine a while back it was remarkably similar front to back - within 10-15 lbs if I recall correctly.
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Old 10-24-2014, 11:43 AM   #9
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I don't have much experience weighing them. The 218 up above falls in with what I have always guessed: That a stock /6 weights just under 440lbs with very little gas and no tools. A good 100lbs lighter than most comparable bikes. I am hoping I have my bike down to around 410lbs thusly weighed. But bike weight is about like discussing gas mileage. A friend of mine swears his half ton four wheel drive monster truck tired pickup gets 28mpg. Sure it does.
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Old 10-24-2014, 03:59 PM   #10
pommie john
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Quote:
Originally Posted by cjbecker View Post
You will only be getting roughly half the weight of the bike on the scale.
That's the idea. You find out which wheel has more weight on it by weighing the front and back separately.
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Old 10-24-2014, 05:49 PM   #11
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A link provided on one of those Brit sites shows that the distribution is 44.5F/55.5R for the R100S. That's more rear-loaded than I thought it would be.

http://www.omnilex.com/public/bmw78/cm5.jpg
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Old 10-24-2014, 05:58 PM   #12
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When I go two up extended touring the distribution is 100% heavy, front and rear.
Got to drive it like a racing Kenworth.
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Old 10-24-2014, 08:03 PM   #13
Rucksta
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Quote:
Originally Posted by supershaft View Post
I don't have much experience weighing them. The 218 up above falls in with what I have always guessed: That a stock /6 weights just under 440lbs with very little gas and no tools. A good 100lbs lighter than most comparable bikes. I am hoping I have my bike down to around 410lbs thusly weighed. But bike weight is about like discussing gas mileage. A friend of mine swears his half ton four wheel drive monster truck tired pickup gets 28mpg. Sure it does.
What's subjective about bike weight?
Scales have a standard of accuracy and are easily calibrated.
Gravity is relatively constant across the surface of the planet.
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Old 10-25-2014, 12:44 AM   #14
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Quote:
Originally Posted by SculptD View Post
the distribution is 44.5F/55.5R for the R100S. That's more rear-loaded than I thought it would be.
My owners manual says 42F/58R for the mono - more on the rear than I'd of thought too, but might explain why I want to get more forward in corners.
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Old 10-25-2014, 03:48 AM   #15
chasbmw OP
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The figure I got from the bm bikes forum is 45% F and 55 R, so I will go with that.

I think that vehicle weights are a bit more useful now, I don't think any manufacturer gives a "dry weight" anymore which is as useful as a chocolate teapot. Bmw give on the road weights including a full tank, which is a useful comparison. When I cam back from this years trip, I weighed my baggage, total weight was 100 lbs, have to pack more carefully next year!
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