METZELER RACETEC RR K3 190/50-17 ZR 73W TLMetzeler Racetec RR K3 180/55ZR17 73W TL Rear Motorcycle Tyres. The Metzeler Racetec RR is a range designed for that Road Racing rider that wants the technology, comfort and grip of a racing tyre for the road or track day. So once again as with its predecess..