My friend had new tires installed on Saturday by a very good indy, was riding today at high speed I should say in excess of 95 miles per hour, when he lost the valve stem cover (plastic bullet shaped cover) and the valve core out of the rear tire. He had just been to the local dealer for some shopping, only a couple of customers in the dealership, he got about 3-4 miles down the interstate when the tire went flat and the back end went wobbly. He was sucessful in coming to a safe stop. I personally have never heard of a valve core coming out before, I think someone screwed with his bike, any opinions out there?

 

the valves are threaded and screw into the valve. either someone dicked with his valve stem OR when the tires were installed, the mechanic failed to screw the valve tight. ive never heard (or seen) anyone ever losing the valve

 

no flame intended but if he is gonna run those speeds he might want to check things more closely himself! never seen one come out of a valve stem... lost plenty of caps though, most of em grew legs!!!

 

I had the front tire valve stem come within 1/8 of a turn of coming completely out. It was on the original tire and after about 20,000 miles. I had installed "Accu-Pressure" pressure indicating valve caps, the pressure indicating part flew off and the valve stem had unscrewed allowing the air to leak out. I'm sure it was unrelated but if I had a standard cap on it the air would not have leaked out as fast. I strongly do not recommend Accu-Pressure pressure indicating valve caps, as 4 of 6 installed caps failed and the company didn't seem to care about the possible consequences when I contacted them.
Gregm

 

I'm more convinced that someone screwed with him, Thanks for your input!

 

About a year ago or maybe even longer this came up as a guy just had a new or 2 new tires put on and one of the valfe cores came out .. If they arent tight i guess why couldnt it happen? And also if they forget to put the cap on then it can come all the way out easier than if the cap is in place

 

Never heard of that happening but the important thing is your Buddy is ok.

 

Had similar thing happen to me , just not after new tire install. At Sturgis two years ago Bought these cool looking (bullet) valve stem covers had nice rubber seal inside. went for ride later that day noticed soft feeling in rear tire stopped and tire was near flat. took cap off to put more air in and stem shot out. put stem back in air tire then noticed marks on my nice new cover, checked and could see where it was hitting brake caliper. Rubber seal set to far down on stem and spun thing right out. Might be something to check .

 

Friend of mine had same thing happen a couple years ago. He was running probably 70-75 with his wife on with him, pulling a Bushtec trailer and the valve stem came out of his rear tire. He was able to get it slowed and off the road without a crash. Had just had a new tire put on. Thinks the guy didn't get the stem tight.