Author Topic: wobble in front tire from 30-40 mph  (Read 2270 times)

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Offline cowie

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wobble in front tire from 30-40 mph
« on: May 22, 2017, 05:45:18 am »
hey guys,

Just had new tires put on and the front has a wobble from 30-40 mph. Im wondering if that sounds strictly like a balance issue because its only felt at that speed or could it still be a bad tire? even at 100mph nothing can be felt, its only at 30-40 ish

thanks for any input, cheers.

Offline Tree

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Re: wobble in front tire from 30-40 mph
« Reply #1 on: May 22, 2017, 05:52:40 am »
Start with checking the balance if you can.  The last thing altered tends to be the first thing to behave badly.  Check all fasteners for tightness/torque.  Don't ignore it.  It's your bike and you know how it feels when "sumthin' aint right".  Right?
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Offline mattchewn

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Re: wobble in front tire from 30-40 mph
« Reply #2 on: May 22, 2017, 08:51:23 am »
cowie,
A low speed wobble is pretty much guaranteed to be a tire condition and NOT a balance issue. Tires can be damaged while being mounted and result in a wobble as well as a manufacturing defect that sometimes makes it through. First verify it is correctly seated around the rim at the bead. After that get the tire raised off the ground where you can spin it and watch the circumference of the tire as you spin it, most likely you will be able to see the out-of-round condition. Once you verify the out of round you can get a warranty replacement tire.
Matt
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Offline ZXtasy

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Re: wobble in front tire from 30-40 mph
« Reply #3 on: May 22, 2017, 11:27:12 am »
Just for full disclosure, what brand/model tire is it?
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Offline Slingblade

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Re: wobble in front tire from 30-40 mph
« Reply #4 on: May 22, 2017, 12:49:23 pm »
I used to run Continental Conti-Motion tires quite often and the front had a tendency to do this - whenever I would take may hands off the bars at 40 - 50 mph it would wobble back and forth quite a bit and it would get worse with more wear.  When I would replace the tire it would be fine but eventually the wobble would return and get worse until I got a new one.  It wasnt a big deal because I generally tend to ride with my hands on the bars  ;), however - I am sure the wobble probably induced some fatigue.

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Offline gPink

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Re: wobble in front tire from 30-40 mph
« Reply #5 on: May 22, 2017, 01:23:14 pm »
It kinda is a big deal....bike should not wobble.  :??:

Offline cowie

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Re: wobble in front tire from 30-40 mph
« Reply #6 on: May 22, 2017, 02:44:32 pm »
thanks guys.

yes its a Continental Conti-Motion  ....... :-[ never again will i buy such garbage.  i will verify its a bad tire with mattchewns method and report back.

Offline Sailor_chic

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Re: wobble in front tire from 30-40 mph
« Reply #7 on: May 22, 2017, 05:21:50 pm »
What about proper head bearing torque?
Nicole     Port St Lucie, FL.
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Offline cowie

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Re: wobble in front tire from 30-40 mph
« Reply #8 on: May 22, 2017, 08:09:46 pm »
Please explain more?  What happends if the axel isnt torqued properly?

Offline old n slow

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Re: wobble in front tire from 30-40 mph
« Reply #9 on: May 22, 2017, 10:43:03 pm »
Same problem here lone time with a perfectly balanced tire...exact issue. Replaced the tire and everything was normal again.
Mike D.   

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Offline Slingblade

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Re: wobble in front tire from 30-40 mph
« Reply #10 on: May 22, 2017, 11:11:06 pm »
thanks guys.

yes its a Continental Conti-Motion  ....... :-[ never again will i buy such garbage.  i will verify its a bad tire with mattchewns method and report back.

They ( Conti-Motions ) grip well and they are very inexpensive - yet wear-out quickly and the fronts definitely develop a wobble at moderate speed.
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Offline mattchewn

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Re: wobble in front tire from 30-40 mph
« Reply #11 on: May 22, 2017, 11:30:27 pm »
KTM was using the Conti Attacks as stock tires. They have now dropped them as factory rubber on the new bikes. I wonder why? 

Matt

We had 3 or 4 different bad Conti's on one bike! Get a new one and it was bad too. Crap tires.
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Offline concfronc

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Re: wobble in front tire from 30-40 mph
« Reply #12 on: May 28, 2017, 04:10:29 pm »
Please explain more?  What happends if the axle isn't torqued properly?

She didn't say anything about the axle she said to check the head bearing for proper adjustment. A loose head bearing can cause a wobble.
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Offline Robby1953

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Re: wobble in front tire from 30-40 mph
« Reply #13 on: May 28, 2017, 06:30:09 pm »
Seeing that tires were just replaced, tires are most likely issue, head bearing not likely the problem.
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Offline Sailor_chic

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Re: wobble in front tire from 30-40 mph
« Reply #14 on: May 29, 2017, 12:54:18 pm »
Please explain more?  What happends if the axle isn't torqued properly?

She didn't say anything about the axle she said to check the head bearing for proper adjustment. A loose head bearing can cause a wobble.

On my VMax, proper head bearing torque is very important or you will have your hands full. Trust me on this! Not saying this is the issue on your bike, but its something to keep in the back of your mind to check.
Nicole     Port St Lucie, FL.
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Offline Con05_NH

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Re: wobble in front tire from 30-40 mph
« Reply #15 on: May 29, 2017, 10:38:10 pm »
I had the decel wobble with last to set of Pirelli GT's.  We serviced the steering head bearings with no change.  Next set had the dealer service the steering head  with no change. Gave up and went to tapered roller bearing. Problem solved.  Tracks beautiful with no decel wobble.

Offline gpd323

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Re: wobble in front tire from 30-40 mph
« Reply #16 on: May 31, 2017, 10:47:28 pm »
My experience:

Angel GT's several sets no issues. OEM tire set no issues. Last 3 sets of Avon Storm 3DXM 45 mph decell wobble with all 3 sets. PR4's, no wobble.

Friend with a newer ZX14R, wobble with the OEM tires. Wobble with Angel GT's, wobble with PR4's. He is now on Avons, yep decell wobble like all the rest of the tires.

Can you always blame the front tire? What if its the rear and causing a harmonic freq that shakes the front? Just because its felt in front, does it mean it originates there? Or in another area of the chassis?

 :beerchug:
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Offline Daytona_Mike

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Re: wobble in front tire from 30-40 mph
« Reply #17 on: May 31, 2017, 11:32:15 pm »
30 to 40 mph is almost always  the steering head bearings. New tires will show you there is a problem where as worn or other makes of  tires will not  show up as much.
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Offline gpd323

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Re: wobble in front tire from 30-40 mph
« Reply #18 on: June 01, 2017, 12:08:36 am »
30 to 40 mph is almost always  the steering head bearings. New tires will show you there is a problem where as worn or other makes of  tires will not  show up as much.

My friends ZX14R wobbled from new BTW.  :beerchug:
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Offline smithr1

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Re: wobble in front tire from 30-40 mph
« Reply #19 on: June 01, 2017, 05:04:31 pm »
I feel the build of both the C10 and 14 put the bike in a state that it is very close to having head shake issues.  Depending on your final setup all the bike needs is a trigger to have it start the oscillation when your hands are off the bars.  Loose head bearing, bad tire, bad balance can all be triggers.  After 3 C10s and now the 14 I just don't let go.  It is not worth the risk.
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Offline gpd323

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Re: wobble in front tire from 30-40 mph
« Reply #20 on: June 05, 2017, 12:02:38 am »
Friend with the ZX14R just came back from a 3K trip with the Avons. Recall he had head shake no matter what tire he used before. He said it got worse as the miles got near 3k and is not going to run the Avon Storm 3DXM anymore on the front. He really likes the rear as it had enough tread to get him home. Rear Angle GT would have been on the cords at 3K miles the way he rides.... :motonoises:

I like the Storms, the head shake I get was only using the Storms, but keeping my hands on the grips, no issues. I will run this set of Avons to the wear bars, and then for my 3K trip in Sept I have a new set of the GT's to install that will get me to 3K and the front will be toast. I will be back on the Avons next time.

 :beerchug:
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Offline Daytona_Mike

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Re: wobble in front tire from 30-40 mph
« Reply #21 on: June 05, 2017, 01:11:58 am »
30 to 40 mph is almost always  the steering head bearings. New tires will show you there is a problem where as worn or other makes of  tires will not  show up as much.

My friends ZX14R wobbled from new BTW.  :beerchug:
That is because it was not assembled at the dealer correctly. It does happen not just to ZX14's but to C14's and C10's and any other bike where the stem bearing was not tightened enough.
There should be NO head shake at any time even when hands are off   and  it should not be accepted as - 'oh well my friends bike does it so it must be ok'.  It is never ok.
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Offline gPink

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Re: wobble in front tire from 30-40 mph
« Reply #22 on: June 05, 2017, 10:24:15 am »
 :goodpost:

Offline gpd323

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Re: wobble in front tire from 30-40 mph
« Reply #23 on: June 05, 2017, 10:40:43 pm »
30 to 40 mph is almost always  the steering head bearings. New tires will show you there is a problem where as worn or other makes of  tires will not  show up as much.

My friends ZX14R wobbled from new BTW.  :beerchug:
That is because it was not assembled at the dealer correctly. It does happen not just to ZX14's but to C14's and C10's and any other bike where the stem bearing was not tightened enough.
There should be NO head shake at any time even when hands are off   and  it should not be accepted as - 'oh well my friends bike does it so it must be ok'.  It is never ok.

Ok, but the bike is essentially assembled including the steering head and forks when it comes boxed from the factory. So where is the dealer prep at fault here?

My experience, the Avons have head shake, no other brand of tire did this. So blame the steering head tightness? I blame the tires. But I like the Avons.
Greg Downing
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Washington State

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Offline Daytona_Mike

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Re: wobble in front tire from 30-40 mph
« Reply #24 on: June 06, 2017, 12:51:31 am »
I ran Avons for many years and yes I had head shake at 35 to 45 and yes, it was my steering stem bearing. At first I had tried and tried by re-greasing and tightening
to no avail. 
Then I  replaced it with new bearings  after this forum told me it was the steering stem and I still could not get rid of the 'hands off only'  wobble at 35 to 45 mph.
Then I took my bike to my first COG Nationals and they had a Tech Day so I put  my bike in. By this time I had 8k miles on the bike.
They said it was not tight enough!. Really?? I thought I had tightened the cr@p out of it already.
 I was taught right there that day on  how to properly adjust the bearing.  Tight- really tight until there was a bit of drag and it would not bounce off the turn stops and TADA!!! Fixed and I never had the problem again but  I had to properly periodically  re-grease and re-tighten   the  stem bearings and by 100k miles I had to replace the bearing again but I never had to live with head shake again and the bike stopped wallowing in the corners (which it did bad when the stem bearings were not properly tightened) and I ran AVONS (because they were the best tire for that bike) for most all of the 120k miles I put on that bike (until PR4 GT's came out).

Do not blame the AVON... it is not the AVON it is the bike. The AVON was there to tell you there is something wrong with the bike because it is a good grippy tire.
« Last Edit: June 06, 2017, 01:05:28 am by Daytona_Mike »
Normally aspirated engines have perpetual turbo lag
2000 Red C10 1052 kit
2008  C14 Silver Dammit Full AreaP- Flies are put back in SISF_Flash
2011  KLR650   688 piston ported and polished
2011  KTM 530    This thing is FUN!!