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Continental Supersonic Race 28 tubes(3 posts)

Continental Supersonic Race 28 tubesglia
Sep 1, 2003 4:54 PM
I am looking for a place to buy these light weight (55g) butyl tubes. All my google searches took me to Europe. Any leads in the US?
re: Continental Supersonic Race 28 tubesBrooksey
Sep 2, 2003 3:17 PM
I recently built up a time trial bike using Conti GP Supersonic 23c's and the Conti Race 28 tubes mentioned, also including the recommended Conti rim tapes. I noticed that the tires are made in Germany but the tubes in Taiwan. I also noticed that these tubes are manufactured with five seams running Longitudinally. What I am leading to is that the front tube burst within 5 minutes of initial inflation and the rear tube slowly deflated during first use, 20 miles into a time trial. Both failures were at the seams I mention, and nothing had penetrated the tire. Inflation pressure was around 115psi well within the max of 145psi recommended. As a result, I have no confidence in these tubes and have now fitted some Hutchinson latex tubes that I have used on other wheels (Vittoria Open CD's) for 3 seasons without any problems. Has anyone else had similar experience with these Conti tubes?
re: Continental Supersonic Race 28 tubesglia
Oct 11, 2003 7:37 PM
You may have had a very strange combination happening. All butyl tubes are made with 5 strips and have seams. I use these tubes on all my rides including training rides under Veloflex Pave tires and have not flatted yet. I do have velox rim tape underneath. I love these tubes and have ordered a good bunch of them. They are 53g in the 60mm version. You save at least 25g per tube plus on your spare. Here's a cheap way to drop 75g. They do not hold the pressure as well as thicker walled butyl tubes. However, I inflate my tires before every ride anyway.