Check that psi! - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
General V-Strom Discussion Talk about all things V-Strom not limited to just one of the above models

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post #1 of 41 Old 08-04-2009, 11:15 PM Thread Starter
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Check that psi!

Noticed this after getting home from my commute an hr ago..

http://picasaweb.google.com/3dig71/D...eat=directlink

Not good

Can anyone tell me if this is a common result of underinflation?

I was at 27psi (tire is Shinko 705 rated at max psi 33)

Or is there something else at work here.

I mounted these tires, and they were my first ever.

Thanks for the insight!

Last edited by 3dig; 08-06-2009 at 11:24 AM.
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post #2 of 41 Old 08-04-2009, 11:59 PM
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That's a result of using Shinko tires.
For God's sake, man, loosen up on that wallet.
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post #3 of 41 Old 08-05-2009, 12:38 AM
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Wow. Are you sure you had 27 psi in there? I've never seen a tire do that, but it looks like it could have been caused by under- inflation.


Here is a quote from another forum regarding a crack at the mold line:

Well, when you pry at the edge of the mark, it starts to open up like a crack so what does that tell you? I called MC Superstore and asked if they had received any similar complaints of defective 705's and was told no. The guy did ask what pressure I was running and I said around 36psi - he said they had just gone thru a tire seminar with Pirelli and Metzler Reps and had been told to tell customers to run tires at the pressure listed on the particular tires sidewall. He said the Reps told them that for every # of pressure a tire is run under-inflated at speed, the tire temp goes up 10 degrees Fahrenheit.

"Build a man a fire and he'll be warm for the night. Set a man on fire and he'll be warm for the rest of his life." - Confuseus

Last edited by jackpiner57; 08-05-2009 at 12:40 AM.
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post #4 of 41 Old 08-05-2009, 12:56 AM
 
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that is not a crack at a tread block

that is ok, that is an impending tread seperation. get it off, and yes running real low could have made it worse. that one is unsafe.
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post #5 of 41 Old 08-05-2009, 12:59 AM Thread Starter
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Just checked the tire again, and its at 25psi (totally cold), probably lost .5 while getting several readings. So, granted, I was 8lbs under recommended..

My question: Is this kind of damage consistant with 8 lbs of underinflation?

If my matinence habits are questionable, I can accept that, and make adjustments.

Or is this a tire quality issue?

Empirical evidence suggests 8lbs underinflation severly overheated these tires.

My gut tells me, under the same circumstances, a "higher quality"
tire would not suffer the same deformation.

My brain tells me not to cheap out on something so important, and above all CHECK THE DAMN TIRE PRESSURES!

Either way, I consider myself lucky.

Thoughts?

Last edited by 3dig; 08-05-2009 at 01:11 AM.
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post #6 of 41 Old 08-05-2009, 01:34 AM
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Quote:
Originally Posted by jackpiner57 View Post
I called MC Superstore and asked if they had received any similar complaints of defective 705's and was told no. The guy did ask what pressure I was running and I said around 36psi - he said they had just gone thru a tire seminar with Pirelli and Metzler Reps and had been told to tell customers to run tires at the pressure listed on the particular tires sidewall. He said the Reps told them that for every # of pressure a tire is run under-inflated at speed, the tire temp goes up 10 degrees Fahrenheit.
A month ago I pumped up my tubeless wheelbarrow tire to the pressure on the sidewall and before I knew it, it blew up in my face. My ears are still ringing too. I know it's not a motorcycle tire, but I get uneasy inflating them to what's written on the sidewall.
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post #7 of 41 Old 08-05-2009, 01:52 AM
 
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I would suggest you buy the best quality tires that your pocket can afford. Personally I would not walk across the street for your brand of tire even if they were giving them away. A motorcycle offers no protection in a crash and with only two tires, to lose either will usually put you in the hospital if you are lucky or in the morgue if you are unlucky.:shocked:
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post #8 of 41 Old 08-05-2009, 01:58 AM
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Ummm... I call shody tire manufacturing in this case...

I don't care if you are underinflated 10 PSI or overinflated 30 PSI, the tire should not fall apart like this! The burst pressure of the tire is usually like 200 PSI or something. Underinflation is sometimes desired offroad and this tire is supposed to be able to take it???

I considered Shinko after my stockers go but I am not anymore.

Which reminds me... as I brought my new Wee home from the dealer and checked the pressure few hours later - it was at 60 PSI!!

PS. I am not a tire expert, just play one on the Internet.

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post #9 of 41 Old 08-05-2009, 03:26 AM
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Quote:
Originally Posted by bigboy292000 View Post
Ummm... I call shody tire manufacturing in this case...

I don't care if you are underinflated 10 PSI or overinflated 30 PSI, the tire should not fall apart like this! The burst pressure of the tire is usually like 200 PSI or something. Underinflation is sometimes desired offroad and this tire is supposed to be able to take it???
+1
That is a shit tyre it has nothing to do with under or over inflation and it should be removed from the bike before the bike is ridden any further to eliminate the risk of a total failure and consequent crash.
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post #10 of 41 Old 08-05-2009, 09:34 AM
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WOW! That looks extremely dangerous! I would not ride another mile on that tire. Sever underinflation (and 8 PSI is pretty sever on a motorcycle) probably contributed tot he failure of that tire. Whether a "higher quality" tier would have fared better I can't decisively say. However, that picture is enough to make me seriously doubt that I'll ever consider buying a Shinko tire. Like Mortaine said, of all the places to scrimp and save a buck, your tires are not that place to do it. Those two little contact patches are the only things separating you from a ride on a cheese grater.
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