At 21.5 ft in diameter, 41-in. high, and 16.5-in. thick, the finished ring — here wrapped for shipping — is the largest kiln tire Ladish Forging has produced in 35 years.At 21.5 ft in diameter, 41-in. high, and 16.5-in. thick, the finished ring — here wrapped for shipping — is the largest kiln tire Ladish Forging has produced in 35 years.