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Thanks for checking. I couldn't find much either but I've 2 31.6s and they're just slightly too big with the clamp completely removed and I found this thread, admitidely only one person who says 30.9 and the seller I bought from tried to sell me a 30.9 to use with it
http://weightweenies.starbike.com/forum/viewtopic.php?t=87581
PhilDAS
¡apesta!
Don't get a 30.9 until you've measured properly and are absolutely certain that it's what you need. There doesn't seem to be much evidence that System Sixes used anything other than 31.6 or 27.2, depending on the year/version.