Cyclones having an inlet housing and depending conical housing with abrasion resistant liners and a mechanism for replacing the worn out liners without having to remove the cyclones from their working positions and disassembling them. The cavern has a base with information therein to indicate the state of wear of the tire and a ceiling that is progressively worn away as the tread wears. The second fan unit is located on an air outlet side and includes a casing and a fan wheel received in the casing of the second fan unit. The error correction circuit corrects the single-bit error of the read data based on the location of the single-bit error. With this, a series of the processes to confirm the write data transfer end can be executed in high speed.