Single Cyl Piston Ring Set 105.61 mm Bore 4.158

The Single Cyl Piston Ring Set 105.61 mm Bore 4.158 from Wiseco is engineered for high-performance engine builders and machine shops seeking precision-fit piston ring solutions for single-cylinder applications. This file-fit ring set addresses the critical need for tight bore tolerances in custom engines, racing builds, and specialty powersports applications where standard off-the-shelf rings fall short. Wiseco's reputation for quality ensures reliable performance in demanding environments where ring seal integrity directly impacts horsepower delivery and engine longevity.

This piston ring set features GF-style design with 0.047 inch x 0.047 inch cross-sections and 3.0 mm thickness, manufactured from premium steel with gas nitride surface treatment for superior wear resistance and durability. The file-fit construction requires final honing to achieve the exact 4.158 inch bore diameter, allowing builders to match rings to their specific cylinder dimensions for optimal blowby control and compression retention. Standard tension specifications ensure consistent radial pressure against the cylinder wall while minimizing friction losses—a critical balance in performance engine tuning where every tenth of a horsepower matters.

Machine shops, engine rebuilders, and performance enthusiasts benefit most from this single-cylinder ring set when building or restoring high-revving powerplants that demand precision components. Installation requires proper ring gap sizing, bore honing to final dimensions, and careful piston-to-cylinder clearance verification to ensure reliable operation. The Wiseco 4158GFX specification works across various single-cylinder applications including small-displacement racing engines, vintage motorcycle builds, and specialty automotive platforms where bore diameter falls within the 105.61 mm specification window.