Originally Posted by
Sheldon Brown
There are two types of seating problems:
1. Tire bulges out.
B. Tire dips in.
1. When the tire bulges out, it is often tube related, typically the tire bead is sitting on top of the tube somewhere. This is especially common near the valve, where there's a reinforcing patch around the base of the tube. It's also common if the tube is a bit too big for the tire.
With a "bulge" type mis-seating, the tire is at risk for blowing off.
Apologies for resurrecting an old thread. So what do you do when the tire bulges out? I've just got myself a pair of Mavic Open Pros and Michelin tires and tubes to put on them, and I simply cannot figure out a way to get the tire to stop bulging out at the valve. I've let out the air and can see clearly that the reinforcing patch for the tube is indeed getting caught under the bead, but I cannot finagle it over so that the bead sits lower down. I'm using 700x23 tubes for 700x23 tires. Is there a special technique for doing this, or should I just get 700x20 tubes?
Thanks
R