I do have a 10.5, 13.5 and 17.5. I went from 3.5r large track to running the 10.5 which was cool and was even considering dropping to the 17.5. I can give it a little more time and see if more people show interest on a carpet track over a large track but I am eager to get my tc5r up and running as well. I am in no hurry to sell it though.