Wiseco 4125VM Piston Ring Set 4.125 in. Bore 1.2 x 1.2 x 2.0mm

The Wiseco 4125VM is a performance piston ring set designed for a 4.125-inch bore with a 1.2mm / 1.2mm / 2.0mm three-ring configuration. Engineered specifically to pair with Wiseco forged pistons, this ring set delivers precise sealing, superior compression retention, and effective oil control for high-performance automotive and powersports engines.

Key Features:

• 4.125-inch bore diameter with a 1.2mm top compression ring, 1.2mm second compression ring, and 2.0mm oil control ring
• Manufactured to Wiseco's exact specifications for optimal fit and performance with Wiseco forged pistons
• Gas-nitrided ring surface for enhanced hardness, wear resistance, and reduced break-in time
• Compatible with cast iron, chrome, Nikasil, and boron composite cylinder bore compositions
• Diamond-turned finish produced on CNC turning centers ensures consistent sizing and a precision fit with no dimensional variation
• Designed and tested for race-ready performance — from compression and sealing to oil control
• Suitable for both high-performance racing builds and performance street engine rebuilds

Wiseco piston rings are an essential component of any top-end rebuild, ensuring the integrity of the combustion seal and the longevity of the piston assembly. When used alongside Wiseco forged pistons, the 4125VM ring set provides a matched, performance-validated combination trusted by racers and engine builders worldwide.