I tried a tube in them one time and that was the first pair I ever owned. The guy in Speed Unlimited who sold them to me said that I 'HAD' to have tubes in them. I had a hella time getting them to balance,.. and they were just a general PITA. I bought my second pair used and mounted them with out the tubes by mistake,.. plugged a valve stem back in and then to my surprise they held air just fine. After that I've never run tubes in any tires,.. even slicks. Of course back then I was a cheaper bastard then I am now and the $15 for tubes was considered too much. Figure you could get a Whopper or Wendy's double back then for $.99. Krystal and White Castle used to do 6 for $1 back then too.. ah the days.

Hurst