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FLAVALK
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Winter Springs, Florida
« on: June 21, 2009, 10:02:00 AM »
...and I an't talking about the Easter Bunny. Went for a 150 mile run today on my new front Avon Cobra and the front end hops around 35 mph...crap!  Angry

It seems to only do it between 35-40 and then smooths right out. I was running 42 psi and wondering if this might be to high for this tire, or is the tire bad? Besides that little issue, I like the tire. It makes the front end seem lighter and it the bike falls effortlessly into a turn.

The tire I replaced was an Avon Venom. 42-psi for 20,000 miles with no issues.

Seems that I read here about someone else with a 35-mph hop with the Cobra.
« Last Edit: June 21, 2009, 10:05:50 AM by FLAVALK » Logged
Live From Sunny Winter Springs Florida via Huntsville Alabama
Disco
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Armed Man=Citizen; Unarmed Man=Subject

Republic of Texas
« Reply #1 on: June 21, 2009, 11:00:00 AM »
This sounds like a balance issue.  I can't see how pressure would be the cause.  Is it balanced with either lead or dynabeads?  I have 2 ounces of dynabeads in my Venom front and it's as smooth as glass.  
« Last Edit: June 21, 2009, 11:01:32 AM by Dave in Frisco (TX) » Logged
2000 Bumblebee "Tourer", 98 Yellow & Cream Tourer, 97 Rescue blower bike
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FLAVALK
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Winter Springs, Florida
« Reply #2 on: June 21, 2009, 11:20:19 AM »
Quote from: Dave in Frisco (TX) on June 21, 2009, 11:00:00 AM
This sounds like a balance issue.  I can't see how pressure would be the cause.  Is it balanced with either lead or dynabeads?  I have 2 ounces of dynabeads in my Venom front and it's as smooth as glass.  

It's balanced with lead. Tire mounting is the only thing that I don't do in the routine maintenance of my bike. Guess I will have to start.
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Live From Sunny Winter Springs Florida via Huntsville Alabama
Ricky-D
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South Carolina midlands
« Reply #3 on: June 21, 2009, 11:42:19 AM »
If you can get the front off the ground it's easy to check the run-out of the tire.  And I don't trust bubble balancing if that's how it was done.

And yes, if there is a tire construction problem, lower pressure in the tire will tend to minimize any bouncing. A harder tire will make irregularities more pronounced.
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2000_Valkyrie_Interstate
FLAVALK
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Winter Springs, Florida
« Reply #4 on: June 21, 2009, 03:53:47 PM »
Quote from: Ricky-D on June 21, 2009, 11:42:19 AM
If you can get the front off the ground it's easy to check the run-out of the tire.  And I don't trust bubble balancing if that's how it was done.

And yes, if there is a tire construction problem, lower pressure in the tire will tend to minimize any bouncing. A harder tire will make irregularities more pronounced.

I took the wheel & tire to a local shop and let them mount & balance it, so I don't know how it was done. Guess I'll remove the wheel and balance it myself...should have checked it before I put it back on the bike.  Angry
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Live From Sunny Winter Springs Florida via Huntsville Alabama
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« Reply #5 on: June 21, 2009, 06:00:56 PM »
Good point, Ricky.   cooldude  I didn't think of a faulty tire at new or 150 miles. 

But, if memory serves, there have been some reports here over the last year or so about Avons failing prematurely.
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2000 Bumblebee "Tourer", 98 Yellow & Cream Tourer, 97 Rescue blower bike
22 CRF450RL, 19 BMW R1250RT
78 CB550K
71 Suzuki MT50 Trailhopper


VRCC 27,916                   IBA 44,783
dcfan2
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« Reply #6 on: June 23, 2009, 07:16:08 AM »
I had the ame problem with an avon venom.about 35mph would get a rythmic bounce.Pulled tire and had balance checked-spot on.Tire pressure made no difference.Tire had about 8 grand on it and still half of tread left.Also developed some handling issuses--possible belt broke?.Changed  to a Metz 880 and no more bounce.Possible break down in tire?
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hubcapsc
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upstate

South Carolina
« Reply #7 on: June 23, 2009, 10:34:19 AM »
Quote from: Ricky-D on June 21, 2009, 11:42:19 AM

I And I don't trust bubble balancing if that's how it was done.



they have to keep those bubble balancers calibrated.

I never heard of anyone needing to calibrate gravity  coolsmiley

Here's a picture I made when I did my first balance job with a static balancer...



-Mike
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