429 Here's the Mickey Thompson inner tube that is the right one for the new set of MT slicks. At least that's what MT' web site said. Their tech support told me they see this type of failure "ALL THE TIME"! I HAD TO BUY THE NEXT BIGGEST TUBE! Never again. This tube blew on the return road, 15 seconds after I was traveling at 120mph! Never again. I bought new Hoosiers for next season. Grrr,,,