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-   -   Bar weight myth (http://www.advrider.com/forums/showthread.php?t=951298)

Colorado_Rider 01-31-2014 09:32 AM

Bar weight myth
 
My ever since I started lightening my bars by removing the weights I've found the vibrations reduced by a huge amount. Discuss/argue/ignore doesn't matter to me I think it's BS.

OrangeYZ 01-31-2014 10:02 AM

When I installed bark busters on my KLR I left the weights off because I figured there wouldn't be any difference. Made it five miles, said "This sucks," went home and found bolts long enough to put them on.

On that bike it's true, I haven't had them on any others.

fast1075 01-31-2014 10:12 AM

My experience has been that it depends on the frequency of the vibe and the type of bar. The bar end weights help a lot with high frequency buzz, but often to little for low frequency rocking couple.

FrogAndTrumpet 01-31-2014 10:24 AM

I recently fitted (OK, for "fitted" read "bodged" :D) some KTM handguards on my SpeedTona, which entailed junking the bar weights. So far, I haven't noticed any uncomfortable vibes and buzzes in the 'bars - which is just as well because my bodge job means that I won't be able to remove the guards and refit bar weights very easily... :augie

Colorado_Rider 01-31-2014 10:41 AM

This was on an I-4. A single or twin, I've yet to try it on, but the XR650L I had with just a bar, no weights didn't give me near the problems it should have considering how much is vibrated on the highway.

phreakingeek 01-31-2014 10:48 AM

on my DR650, the stock bars without weights were so bad that I didnt even make it 5 miles before going back home.

My handguards now do the job of weights to keep the vibrations from turning my hands into leaden nubs at the ends of my arms.

joexr 01-31-2014 10:50 AM

Quote:

Originally Posted by FrogAndTrumpet (Post 23358187)
I recently fitted (OK, for "fitted" read "bodged" :D) some KTM handguards on my SpeedTona, which entailed junking the bar weights. So far, I haven't noticed any uncomfortable vibes and buzzes in the 'bars - which is just as well because my bodge job means that I won't be able to remove the guards and refit bar weights very easily... :augie

What the hell is a SpeedTuna?:rofl

FrogAndTrumpet 01-31-2014 10:53 AM

A SpeedTona (with an "o" :wink:) is a Triumph Daytona that's been turned into a Speed Triple (usually as a result of a SMIDSY moment). :deal

joexr 01-31-2014 11:07 AM

Quote:

Originally Posted by FrogAndTrumpet (Post 23358408)
A SpeedTona (with an "o" :wink:) is a Triumph Daytona that's been turned into a Speed Triple (usually as a result of a SMIDSY moment). :deal

:rolleyes

Red9 01-31-2014 12:22 PM

Quote:

Originally Posted by Colorado_Rider (Post 23357710)
My ever since I started lightening my bars by removing the weights I've found the vibrations reduced by a huge amount. Discuss/argue/ignore doesn't matter to me I think it's BS.

Yeah cause manufacturers were just looking for places to add additional weight...:rofl

godwinmt 01-31-2014 12:47 PM

Bar weights cannot eliminate handlebar vibrations, they merely serve to shift the resonance point of the bars to some other point in the operating range. The 'vibrations' people notice are a resonance mode in the bars. You can shift where this resonance point is by either altering the mass or stiffness of the bars. Increasing the mass and decreasing the stiffness shifts the resonance point lower in the revs, and doing the opposite shifts it farther north.

You by lightening your bars are shifting the point farther north in the revs. I imagine if you ride a little faster, you'll again find the point where the bars do vibrate, just not where you ride most of the time.

It's Vibes...nothing more, nothing less.

-M

MacNoob 01-31-2014 12:59 PM

If the bars happen to resonate at a frequency that is some harmonic of the engine vibration, you will get vibrating bars. Bar end weights will change the resonant frequency of the bars so they will vibrate at a different RPM that may be outside your common RPM range, reducing the irritant.

toates89 01-31-2014 01:35 PM

Frequency is equal to the spring constant over mass

omega=k/m

As mass increases omega decreases.

markk53 01-31-2014 04:51 PM

Quote:

Originally Posted by Colorado_Rider (Post 23357710)
My ever since I started lightening my bars by removing the weights I've found the vibrations reduced by a huge amount. Discuss/argue/ignore doesn't matter to me I think it's BS.

And you've gained this great insight by removing the weights on how many bikes?

markk53 01-31-2014 04:52 PM

Quote:

Originally Posted by Red9 (Post 23359038)
Yeah cause manufacturers were just looking for places to add additional weight...:rofl


Nah, they got a good buy on them and had to do something. Or maybe it was part of the "bold new graphics" the second year.


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