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Offline JS550

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Tire help
« on: June 11, 2009, 06:18:03 AM »
Ok, got my front tire on my 75, 750k balanced. The original problem was the tire (or front end?) had a noticable undgulation or hop in it, started at about 30-35 & got worse with speed. So, had it balanced, it was checked for round & true, guy said it is good. Problem is, it still has the hop? Its a new tire, what could cause this? Can the tube cause this, or do I have a sh!t tire. I also have progressive springs in the front, just extra info.
jim
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Offline MCRider

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Re: Tire help
« Reply #1 on: June 11, 2009, 06:24:37 AM »
Quote from: JS550 on June 11, 2009, 06:18:03 AM
Ok, got my front tire on my 75, 750k balanced. The original problem was the tire (or front end?) had a noticable undgulation or hop in it, started at about 30-35 & got worse with speed. So, had it balanced, it was checked for round & true, guy said it is good. Problem is, it still has the hop? Its a new tire, what could cause this? Can the tube cause this, or do I have a sh!t tire. I also have progressive springs in the front, just extra info.
jim
Is it seated in the rim equally all the way around? I would assume the balance tech would check this. Otherwise, with all you've checked I'm leaning towards the tire. What brand, discount?

Also, if the fork is locked up or otherwise poorly compliant, stuck, nasty oil etc. that can sometimes magnify a wheel hop.
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Offline JS550

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Re: Tire help
« Reply #2 on: June 11, 2009, 06:34:24 AM »
Tire is a Michelin Macadam, new, & he said he seated it. Said I had it seated wrong. Maybe I should deflate it & try it again?
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Offline Beans

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Re: Tire help
« Reply #3 on: June 11, 2009, 06:42:04 AM »
I would get the front tire off the ground and spin it and see if their is a hop in it. And double check to make sure its seated right.  Also does the wheel have good wheel bearings in it. Sometimes a bad wheel bearing can cause this.  As u check for the tire as you spin it grab the fork tube and check to see if it vibrates if their is a vibration u will have a bad wheel bearing.  But if he said everything is good u might have a bad tire from the factory.
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Offline MCRider

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Re: Tire help
« Reply #4 on: June 11, 2009, 06:43:39 AM »
Quote from: JS550 on June 11, 2009, 06:34:24 AM
Tire is a Michelin Macadam, new, & he said he seated it. Said I had it seated wrong. Maybe I should deflate it & try it again?
That should be a good enough tire to dismiss the tire. (still could be a very rare defect).

But the tire seating issue is still #1. There is a line around the tire right above the rim. It should be of equal distance from the rim all the way around. If he noticed it, he should have gotten it right. But check it. To reseat, you would want the tire off the ground, ie no weight on it. Deflate, break the seat all the way around, both sides, lube it up REALLY well, and reflate to 150% of tire maximum, with the VALVE STEM OUT. The seat should pop up and on all the way around. When you remove the inflator, the air will rush out. Replace the valve and inflate normally.

That's how I would do it. You should get a concensus and do what's comfortable to you. Over inflating a tire is a safety issue, but you don't know where i live.   ;)
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Offline JS550

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Re: Tire help
« Reply #5 on: June 11, 2009, 06:49:32 AM »
Quote from: Beans on June 11, 2009, 06:42:04 AM
I would get the front tire off the ground and spin it and see if their is a hop in it. And double check to make sure its seated right.  Also does the wheel have good wheel bearings in it. Sometimes a bad wheel bearing can cause this.  As u check for the tire as you spin it grab the fork tube and check to see if it vibrates if their is a vibration u will have a bad wheel bearing.  But if he said everything is good u might have a bad tire from the factory.
He actually mentioned that the tire was hard to balance & thought the bearings could be a problem. Maybe I'll change em elemenate that part.
thanks
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Offline MCRider

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Re: Tire help
« Reply #6 on: June 11, 2009, 06:51:17 AM »
Yes Bean's idea on the bearings is a good one, hadn't thought of that.  So now you get to experience the dreaded bearing retainer.
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Offline Beans

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Re: Tire help
« Reply #7 on: June 11, 2009, 10:27:12 AM »
Yea I had an issue like that on my dirtbike had a bad vibration when I was on the cement roads and thought it was a tire issue but ended up after taking it to the shop their they said my bearings where bad and showed me how to check them.  Its an easy way to elemenate the problem.  Even a slight moment in the bearing will cause this.
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