Stans no tubes ztr iron cross cx rimthe new ztr iron cross rim combines a stiff 17 5mm rim depth a 20mm wide internal cavity and our low profile bead socket technology bst sidewalls to virtually eliminate pinch flats under some of the lowest tyre pressures you can run at 385 grams a rim the ztr iron cross disc rim will make your next cyclocross disc wheel build considerably lighter but will still handle all the punishment you can dish out the new ztr iron cross disc rims are designed only