Rust is one of the chains biggest enemy's: The efficiency of the drive, the shifting and durability are getting worse. Rust can even cause chain brakeage. So KMC found a solution to this. The EcoProTeQ anti rust technology compares perfect rust protection with a great shifting performance and durability. Rust is one of the chains biggest enemy's: The efficiency of the drive, the shifting and durability are getting worse. Rust can even cause chain brakeage. So KMC found a solution to this. The EcoProTeQ anti rust technology compares perfect rust protection with a great shifting performance and durability.