Bicycle Mechanics - Tire coming out of rim

Darnest thing - I discovered a flat on the rear wheel of my Specialized Roubaix yesterday before my ride, or planned ride.

I put in a new tube and pumped her up. The tire is riding out of the rim at the valve hole. I didn't notice it, so I had 120 lbs. of pressure before I realized the tube was coming out of the tire. Now I can't get the tire to stay down in the wheel. Can't figure it out- never had this occur before with the same wheel and tire.

It's as if there's an extra layer or two of tube there at the valve, keeping the tire from seating down in the wheel.

Any suggestions?

Thanks,

Hickok

I had a similar thing happen on one of my bikes with a 700X32 tire. I was changing the winter nokian tires for my slicks and the tube snuck out between the rim and the tire. Luckily I was close to the lbs and buddy there noted that sometimes the tire doesn't catch the rim. He deflated the tube, reseated the tire, and then inflated it really slowly, checking that it gripped. That did the trick. No problems after that.

The technical term for this is a "tire-roid" :)

Jawbone has it right, bad tire seat. When they happen at the valve you can deflate it, just poke the valve stem in a little and it will probably seat. Take it slow on the inflate, and make sure the tube didn't get pinched.

The technical term for this is a "tire-roid" :)


That's awesome.

Be careful that the tube isn't folded over. Also, if you haven't done already, make sure the tube has some air in it. Air in the tube will help keep the edges of the tube from getting folded over underneath the bead.

Another trick with very tight tires is to put about 20 psi in once the tire is on, and then rock the tire back and forth on the rim to pull the tube up and inside the tire casing.

...I realized the tube was coming out of the tire. Now I can't get the tire to stay down in the wheel. Can't figure it out- never had this occur before with the same wheel and tire.

It's as if there's an extra layer or two of tube there at the valve, keeping the tire from seating down in the wheel.

Any suggestions?

Thanks,

Hickok

It sounds as if the reinforced area around the valve stem is getting between the rim and tire. This is common but easily remedied.

Deflate your tire. Make sure the tire is seated around the rim evenly. Then push the valve stem outwards, towards the tire, then pull it back into place. This will force the reinforced area of the tube to sit inside the tire cavity, and not interfere between the rim and tire.

Inflate 50 psi, maybe spin the wheel in your hand and ensure the tire is properly seated, then fully inflate. Ride.