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Discussion Starter #1
It appears I have a slow leak in my rear tire, very slow. I couldn't find it and neither could the dealer. Is it perhaps a new bike tire bead thing going on here? I hate to have to replace the tire at 1000 miles, and I know the dealership probably won't go to bat for me on this ( though it's obviously some kind of defect). Here's the facts, appreciate the input/how to handle it with the dealership. BTW the bike is equipped with the tire pressure monitor and these pressures mentioned were verified with a hand held gauge. All temperature variations taken into effect (this TPM adjusts for temp, I took my handheld readings on a "cold" tire.

Brand new bike, rode it off the dealers lot, pressure good.

Day 2 and 3, put 200 miles on it, no problems.

Bike sits in the garage on the center stand for 7 days

Go to ride - rear tire at 35 psi (spec'd at 42). No nails, no cuts, no damage.

Add air, do 300 miles that day, no problems.

Still good the next day. Take to dealership for break-in service, they find no leaks.

Today, down to about 37-39 psi. Ride a bit, add some air, keeping any eye on it.

This whole time, by the way, as a kind of "control", the front tire has been 36-37 psi and no variations.

The bike is always on the center stand when in the garage.

Thanks everyone for the input and help. I know I'll probably have to replace it but all y'all go ahead and holla first.
 

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I think its normal, bike sat for 7 days? Thats why I would check air, wouldn't thing twice about adding a little.
 

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Last diagram. Soft rubber liner. http://www.webdelsol.com/DIAGRAM/2_5/tireconstruction.html That is there to hold the air. If it leaks the air will escape at the whole sidewall of the tire. Very hard to detect.

http://www.fastenal.com/web/products/detail.ex?sku=0815510 This type of leak detection fluid stays wet a very long time and has very low surface tension so the bubbles are quite tiny and do not pop. After about an hour the side of the tire will look like it is covered in a thin sheet of foam. This must be done in the shade on a cold tire laying on its side.

Those strapped for fund$ will put a tube in a "leaker".

I would insist on a new tire. Contact the tire manufacturer. 7# in 7 days is too much drop imho. 2# ok but not 7#.
 

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Discussion Starter #4
Thanks for the input, I agree, 7lbs in 7 days is too much. I'm keeping a close eye on it until I go back to work. I'll top it off and take a cold measurement before I go out for a week, check it again when I come back. If it's that low again then I'm sure there's a problem.

Closer inspection of my warranty info and I see reference that tire manufactureres will have their own warranty. Does anyone know what Bridgestone's warranty is and if they will just cover the tire or pay labor for the swap too? Thanks
 

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Sounds like normal new tire bead seating to me. I always check my tire pressure every day for the first week after a tire change, and often add 7-10 pounds during that time. The bead will always seat, then I'll have to add 2-4 pounds in the next 2 weeks. I've noticed the rear seems to be leakier at first, too, which maybe points to other mechanisms that cause the air pressure to drop on a new tire.

I ride every day, and after the tires have settled in, I check once a week.

Give it another week or two, then see if it still leaks as quickly.
 

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I would double check the stem valve and make sure it is tight, maybe loosen then retighten. I check my pressures before every ride, usually only down at most 2 lbs in a week or two.
 

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Have to disagree with the responces " that's normal". IMO-1>2lbs in 2 weeks is "normal". Other variables are, tire and air temp, measuring device and brand of tire, to mention a few. Stones, Metz, Conti and Mitch loose about 1 lb every 1>2 weeks. I'm presently am running Avon Storms (56/57's). My first experience with Avons. I check tires once a week and they consistantly measure 37/42. Haven't added air for 4 months! I am extremely please with the wear (3kmiles) and responce/turn-in and general handling. Recent mag article on ST tires agree with my experience.
You either need to have the tire remounted or insist on a new one!
 

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I Had something like this in my K1100LT. Replaced the valve stem and it went away.

Tom



iflybricks said:
It appears I have a slow leak in my rear tire, very slow. I couldn't find it and neither could the dealer. Is it perhaps a new bike tire bead thing going on here? I hate to have to replace the tire at 1000 miles, and I know the dealership probably won't go to bat for me on this ( though it's obviously some kind of defect). Here's the facts, appreciate the input/how to handle it with the dealership. BTW the bike is equipped with the tire pressure monitor and these pressures mentioned were verified with a hand held gauge. All temperature variations taken into effect (this TPM adjusts for temp, I took my handheld readings on a "cold" tire.

Brand new bike, rode it off the dealers lot, pressure good.

Day 2 and 3, put 200 miles on it, no problems.

Bike sits in the garage on the center stand for 7 days

Go to ride - rear tire at 35 psi (spec'd at 42). No nails, no cuts, no damage.

Add air, do 300 miles that day, no problems.

Still good the next day. Take to dealership for break-in service, they find no leaks.

Today, down to about 37-39 psi. Ride a bit, add some air, keeping any eye on it.

This whole time, by the way, as a kind of "control", the front tire has been 36-37 psi and no variations.

The bike is always on the center stand when in the garage.

Thanks everyone for the input and help. I know I'll probably have to replace it but all y'all go ahead and holla first.
 

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The first thing that I would check, is the stem, but I bet that you are gonna find that it is the bead. If it was mine, I would remove the tire and thoroughly clean the wheel, where the bead of the tire seats. Usually, when you have tires mounted, the bead seat never gets touched.
 

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grifscoots said:
I scrub the inside of the rim where the bead sits everytime I change tires. Virtually no leak down ensues.
Same here, and I don't lose air at all.
 

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Discussion Starter #14
Well, home from work today and checked that rear tire, not just down 7lbs like last time, totally flat now. Call the dealership tomorrow. This better be under warranty. I figure it's either a bad tire, so it's under Bridgestone's warranty or a bad install, and that's on BMW. Ugh.
 

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That is an 08, so i doubt there was a bit of trash like a bit of rubber on the bead seating area of the rim. Re-inflate the tire and spray real soapy water around the edge of the rim, at the valve stem as well as into the valve stem.

My gut goes with my OP in this thread.

Please let us know the out-come. :popcorn:
 

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Discussion Starter #16
I found the leak late last night. Sprayed the bead/rim and valve stem with soapy water and waited. I thought I heard something...

Gave up on the that after 5-10mins and went to the tire itself. Two sprays later I hear it again, squealing. I found a pinhold in the fattest part of the tire (face of the tire, tread, not in a groove) blowing bubbles at me and squealing. Filled the tire up, lost 7lbs in 12 hours so it is getting worse. Called the dealership this morning and now waiting for a callback. He can't punch up his stock in that computer to see if he has a tire? I wonder how long this will take. Not sure if they will warranty the tire yet. Since the hole is in the tread I'm sure they'll scream road damage and tell me to go pound sand. Though I was complaining of a slow leak right after I bought it...

Still waiting to hear from them. How the dealership handles this (their customer service is on the fence in my book) will really dictate my future with them. No matter, I'm moving in 3 months anyway.
 

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Discussion Starter #17
It's over

Pulled the tire off today (thanks to this site) and it goes to the dealer tomorrow to be replaced. Because the damage is in the tread they will never warranty it, so new tire, mounted and balanced will be about $175. Ugh, oh well.

I did save a bunch of money by removing this tire myself. Got directions and torque specs all thanks to all of you.
 
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