I think the tire or it's valve is defective, or perhaps there is dirt
or somethign holding the valve open -- that doesn't happen to me. And
the fact that it only happens with your rear wheel suggests the same
thing.

JT


Thanks for the response. I'm not sure what you mean. I thought you have to
leave the valve wide-open before you attach the extender, else you can't
pump up the tire once it's on the rim.