ProX Racing Parts (02.1487.000) 86.50mm Bore Piston Ring Set Fits: Honda TRX 420 Rancher 2007-2014 ProX Racing Parts piston rings are made by well-known OEM factories to exact specifications All ProX Racing Parts piston rings can be used in cast iron bores, nickel ceramic plating (Nikasil), boron composite and electro fusion bores Made to OEM specifications and tolerances for guaranteed quality and superior durability Notes: For ProX Racing Parts Pistons with 86.50mm Bore