We only sell the most common sizes, so you can repair or reproduce models that were made by Estes. The only difference is that we use millimeters to distinguish the tube sizes. Whether you call them body tubes or airframe tubes, we've got what you are looking for.
If you are not familiar with tubes being listed in "millimeters," here is a conversion chart that will help you compare our part names and prices with those from Estes:
13mm dia. = BT-5 size tube. Can be used as motor mount tubes for "mini" size engines.
18mm dia. = BT-20 size tube. Can be used as motor mount tubes for A, B & C size engines.
24mm dia. = BT-50 size tube. Can be used as motor mount tubes for "D" size engines.
29mm dia. = Can be used as motor mount tubes for "F" and "G" size engines.
33mm dia. = BT-55 size tube
41.6mm dia. = BT-60 size tube
56mm dia. = BT-70 size tube
66mm dia. = BT-80 size tube