KM447 IMPACT FORGED MONOBLOCK Tires Wheels Direct KM54278568700: 17x8.5 KM542 IMPACT KMC In 6x139.7 0 Offset on Sale KM447 Impact Forged 17x8.5 Machined Wheels 6x135 ET0 CB87.1 Formula Tyres IMPACT FORGED MONOBLOCK KMC Wheels. The KMC Impact Forged is ready to be used and abused on the trails and the streets. Based on our popular Impact OL and Impact Forged Beadlock wheel, the Impact Forged (KM452 KM447) features the same iconic motorsport inspired multi spoke design with some extra muscle for the trails. We make this Forged Monoblock wheel from aerospace grade 6061 T6 forged aluminum, allowing us to produce a lightweight wheel with robust strength for extreme off road use. Available with a Metal Billet cap (KM452) or Bolt On cap (KM447). Forged construction Concave profile Motorsport inspired design Available in popular light truck and SUV sizes Two center cap options available