Mine only had rubber on one side as well. All four were like that though. I thought that is just how they made them...or maybe an older series? Or I got four bum ones.

 

I just got a new one from Rays last week.. It was a bit larger, and had rubber seals on both sides.. I think Rays finally figured out the problem/new series..

 

Rays valve stem was always the same...

 

I will post pics tomorrow of the stems.. You be the judge.. They are different..

 

I believe they are just like my Advans.

 

I didnt get to take pics of the old one and new one naked.. But look at the size difference.. They arent all the same stems.. just to prove my point..

The stem in the first pic is the old one.. Second pic is the new stem.. Its longer......

 

=( im having the same issue on my rears.

 

Rays (Volks) are teh suck