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Old 06-21-2010, 10:30 PM   #1
Diderich
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Low tire pressure pops the bead out?

I was riding home today and the tires felt wiggly. I thought to myself that I should check the pressures when I get back home...now when was the last time I did that?...hmmmm

A couple turns before my house....

I'm minding my own business, taking it easy in the neighborhood....

...and the bike bucked in the middle of the turn. Not "i just said the wrong name during with my wife" bucked, but just an unexpected little mid turn correction.

Taking it even slower now, the bike is squirming but under control, and the next turns are clean.

Did I blow the bead out or something? This is the second time this has happened to me. Once was right after getting a tire put on, and this time was just after a couple of months of the lazies. Checked the rear tire pressure and its down around 10 psi. No nails. No weirdness. The front is barely down a couple psi from normal. Tires are the factory size, michelin pilots.

I have it pressured up now, and I'll watch it over the next couple days.

Mostly i'm just curious about the mid-turn buck and where that might have come from?
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Old 06-21-2010, 10:38 PM   #2
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always, ALWAYS check tire pressures, oil, brake fluid(s), tire conditions, as often as you can. even if you have caught the dumb or lazies, at least check it once a week. I do a pre-ride check before i get on the bike EVERYTIME. (not check tire press everytime, but i check everything else before i throw a leg over.)
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Old 06-21-2010, 10:41 PM   #3
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if you broke the bead the tire would be flat..

I run my Shinko at 10 to 13 pounds on the street and dont have any problems but I keep it like that so I am always ready for a roll race with no tire spin at 8 1/2 over :-)
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Old 06-21-2010, 10:44 PM   #4
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Quote:
Originally Posted by __NATE__ View Post
if you broke the bead the tire would be flat..

I run my Shinko at 10 to 13 pounds on the street and dont have any problems but I keep it like that so I am always ready for a roll race with no tire spin at 8 1/2 over :-)
how long do your tires last???
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Old 06-21-2010, 10:45 PM   #5
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hmm nate, ever had tread seperation? your tire needs to be at the bike manufacturers recomended tire pressure most are 42psi for rear, and if its too low yes you can pop the bead off
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Old 06-21-2010, 10:45 PM   #6
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That little buck was likely a tire slipping on the pavement. Keep a close eye on your pressure.
With experience you can feel when they are just a couple pounds low. You get down to 10 psi and your tires can do all kinds of squirmy odd feeling things.
Not to mention your tire wear will be atrocious.
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Old 06-21-2010, 10:46 PM   #7
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Quote:
Originally Posted by JP171 View Post
hmm nate, ever had tread seperation? your tire needs to be at the bike manufacturers recomended tire pressure most are 42psi for rear, and if its too low yes you can pop the bead off
True but if you did the tire would instantly go flat.
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Old 06-21-2010, 10:48 PM   #8
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yes it would Bumble, but what he is probably feeling is carcass flex or sidewall warping due to very low pressure
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Old 06-22-2010, 05:39 AM   #9
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Quote:
Originally Posted by __NATE__ View Post
if you broke the bead the tire would be flat..

I run my Shinko at 10 to 13 pounds on the street and dont have any problems but I keep it like that so I am always ready for a roll race with no tire spin at 8 1/2 over :-)
what the hope you don't plow into me or my kids during these antics.
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Old 06-22-2010, 06:27 AM   #10
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5 pounds FTW imo
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Old 06-22-2010, 07:10 AM   #11
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you mean theres air inside those things.......
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Old 06-22-2010, 07:13 AM   #12
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Old 06-22-2010, 07:30 AM   #13
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Quote:
Originally Posted by Badzx14r View Post
you probely ran over a tar snake .


cause like the other guy said 8 to 15lbs on my shinko at the track and never broke a thread . along with some big time burn outs and 835lbs of weight
no tar snakes in my neighborhood. Could have been a small rock or something I guess.

The main reason I suspected bead was it didn't feel like it was at 10 psi for most of the ride home. But it's entirely possibly i'm a moron. And there isn't any other obvious reason for the low tire pressure.

Maybe there was a nail plugging a hole, and I threw it out? No I would have heard that big of a hole when I filled it back up. I'll get out the ol' dish soap I think before I go out riding again.

I guess you guys are right, it was just low and hit a bump or crack or something that flexed the sidewall a bunch, and I have to find a slow leak and fix it.
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Old 06-22-2010, 08:13 AM   #14
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Quote:
Originally Posted by Diderich View Post

I guess you guys are right, it was just low and hit a bump or crack or something that flexed the sidewall a bunch, and I have to find a slow leak and fix it.
Right
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Old 06-22-2010, 08:25 AM   #15
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Old 06-22-2010, 08:31 AM   #16
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Old 06-22-2010, 08:36 AM   #17
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talk about about lots of info in this thread... Not hating just poiting out the obvious.
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Old 06-22-2010, 09:29 AM   #18
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It seems high because it is. 42psi is good for going in a straight line for long distances. But if I know Diderich, that's not a good pressure for him.

JP171, running at 42psi is terrible advice.
Bah, it was at 20 again this morning. I'll try and mess with it after work today, and figure out where it is leaking from.

HAHAHA..i usually keep it right at 42 because that's what the manual says. I guess I need a tire pressure primer.

btw I appreciate it when you park the buell over by b7 so that I can check it out every now and again.
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Old 06-22-2010, 09:33 AM   #19
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Quote:
Originally Posted by Diderich View Post
Bah, it was at 20 again this morning. I'll try and mess with it after work today, and figure out where it is leaking from.

HAHAHA..i usually keep it right at 42 because that's what the manual says. I guess I need a tire pressure primer.

btw I appreciate it when you park the buell over by b7 so that I can check it out every now and again.
You never want to inflate a sport tire to 42 psi other than to set the bead. The reasoning is that you will have no grip and the ride will not be comfy in any way shape or form. try 34-36 psi.
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Old 06-22-2010, 09:34 AM   #20
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Quote:
Originally Posted by __NATE__ View Post
if you broke the bead the tire would be flat..

I run my Shinko at 10 to 13 pounds on the street and dont have any problems but I keep it like that so I am always ready for a roll race with no tire spin at 8 1/2 over :-)
huh?
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