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Old 01-31-2014, 09:32 AM   #1
Colorado_Rider OP
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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.
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Old 01-31-2014, 10:02 AM   #2
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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.
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Old 01-31-2014, 10:12 AM   #3
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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.
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Old 01-31-2014, 10:24 AM   #4
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I recently fitted (OK, for "fitted" read "bodged" ) 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...
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Old 01-31-2014, 10:41 AM   #5
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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.
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Old 01-31-2014, 10:48 AM   #6
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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.
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Old 01-31-2014, 10:50 AM   #7
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Laugh

Quote:
Originally Posted by FrogAndTrumpet View Post
I recently fitted (OK, for "fitted" read "bodged" ) 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...
What the hell is a SpeedTuna?
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Old 01-31-2014, 10:53 AM   #8
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A SpeedTona (with an "o" ) is a Triumph Daytona that's been turned into a Speed Triple (usually as a result of a SMIDSY moment).
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Old 01-31-2014, 11:07 AM   #9
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Eh?

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A SpeedTona (with an "o" ) is a Triumph Daytona that's been turned into a Speed Triple (usually as a result of a SMIDSY moment).
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Old 01-31-2014, 12:22 PM   #10
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Originally Posted by Colorado_Rider View Post
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...
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Old 01-31-2014, 12:47 PM   #11
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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.

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Old 01-31-2014, 12:59 PM   #12
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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.
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Old 01-31-2014, 01:35 PM   #13
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Frequency is equal to the spring constant over mass

omega=k/m

As mass increases omega decreases.
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Old 01-31-2014, 04:51 PM   #14
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Quote:
Originally Posted by Colorado_Rider View Post
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?
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Old 01-31-2014, 04:52 PM   #15
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Quote:
Originally Posted by Red9 View Post
Yeah cause manufacturers were just looking for places to add additional weight...

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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