Piston Ring Set for 125cc ATVs Dirt Bikes Go Karts 125cc 125c Quad 4 Wheeler Pit Bike Piston Ring Set. Top Quality Guaranteed. Piston Ring Set for 125cc ATVs, Dirt Bikes & Go Karts Piston Ring 56mm uncompressed; Piston Ring 54mm compressed; High temperature resistant stand high pressure and good work at high speed; Dependable performance with competitive price