Power race issue. Can i trust them? - Kawasaki ZX-10R.net
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post #1 of 21 Old 03-03-2009, 01:44 AM Thread Starter
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Question Power race issue. Can i trust them?

Don't know if this is normal or not. So i'm balancing my front tire and everything went smooth. So i just felt like spinning the tire really fast just because im bored and noticed something disturbing. There is a section of the tire that dips down as it is spinning(looking eye level horizontally). You can visually see the small line 1/8 of an inch above the rim dip down.

It appears like the tire is either deformed or i did not set the bead correctly. So i broke the bead and re-set it again. Still has a section that dips down as it's spinning. Though it is balanced, i find it disturbing that a tire itself(not the RIM) dips, and at high speeds this can be a major issue and can be dangerous.

I spent an hour trying to figure out why it would do that. SO, i change the front with another set. Still having the same problem but at a different section. I got tired of messing with front and decided to do the rear tire. The first thing i do is spin it and look for the dip in the tire as it's spinning. AND the rear does it too!!!!WTF!!!!!. I swaped out three different rears (soft, pr-e, and medium). And they all dip while spinning. Keep in mind i bought these tires from various shops, online, sportbiketrackgear, JCmotors. They can't be all deformed can they??

I have done five track days and plan to do novice heavy weight as soon as the next "new racer school" starts. I have not met pavement yet and plan to keep it that way. This will crush my confidence with Michelins forever!

Does this go away when you put some speed and the tire will stretch out and or even out? Also this is my first time changing/ballancing tires. Can someone please give me an explaination so i can sleep well tonight.

Thanks...
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post #2 of 21 Old 03-03-2009, 11:27 AM
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I suggest you give a phone call directly to Michelin.

At least my PPs do not have that issue.
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post #3 of 21 Old 03-03-2009, 09:09 PM
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i work as a mechanic in a tire store.Just about all my life.it is not unusual to see some slight side to side or up and down movement in a tire as it is on the balancer.no tire is perfectly round.Balance the tire and see how it rides.My guess is it will be fine,especially since every tire you mounted looked the same.
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post #4 of 21 Old 03-03-2009, 09:21 PM Thread Starter
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Quote:
Originally Posted by busa41 View Post
i work as a mechanic in a tire store.Just about all my life.it is not unusual to see some slight side to side or up and down movement in a tire as it is on the balancer.no tire is perfectly round.Balance the tire and see how it rides.My guess is it will be fine,especially since every tire you mounted looked the same.
Thats exactly what i thought. But i don't wan't to risk it. So there's one person on here that thinks its ok. I know there's more guys/gals on here that balance their own tires. Maybe it's just because i haven't mounted enough tires to realize that this is something normal. Any other inputs on this guys?
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post #5 of 21 Old 03-03-2009, 09:26 PM Thread Starter
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Quote:
Originally Posted by sextaafondo View Post
I suggest you give a phone call directly to Michelin.

At least my PPs do not have that issue.
My 002rs never had that issue either. maybe i havent ridden it(broken it in) yet to see the changes. Especially being on a balancer and seeing every detailed imperfections as apposed to being on the bike.
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post #6 of 21 Old 03-03-2009, 09:34 PM
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Tires go through alot of quality checks and prob even more so since the big "firestone" deal, even though it was car tires that had problems, im sure alot of Tire MFGs do better quality checks now, but there is always the chance that errors are made and defects slip past. So If you have any doubt about riding on them or trusting them Id do the safe thing and call Michelin and ask them for their input about it, Id rather be safe and look like a dumb ass for asking the question rather than be the fool who thought it was safe to use them, and they fail. Who knows they may want them back and or send you new ones?? but if it were me id play it safe. just my thoughts on it.

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post #7 of 21 Old 03-03-2009, 09:55 PM
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never noticed anything 1/8" out, but I have seen some as much as 1/16" and that is OK..... did you pump it up to 60 psi to seat it and then let it back down? shit, my '07 zx10r has 1/16" out of true on the rear sprocket carrier and the factory says, " thats OK"!!! go figure

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post #8 of 21 Old 03-03-2009, 10:25 PM Thread Starter
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60psi. is that safe. but it'll call michelin tommoro.
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post #9 of 21 Old 03-03-2009, 10:35 PM
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60psi. is that safe. but it'll call michelin tommoro.
just to seat it...sure

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2002 RC-51 (399lbs dry)
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post #10 of 21 Old 03-04-2009, 04:22 AM
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I think you may want to see this video from a guy around here. His brand new rear P.Power just broke off in two out of nothing at high speed and saved his life just by miracle. Irresponsible riding without protection tho. Bike is a 08 gsxr1k.

Thatīs why you may want to stay on the safe side and call Michelin

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