HASTINGS Replacement Piston Rings — Bore 3.937\", Displacement 107\", Piston Size Standard – 18-21 Softail, 17-20 Touring, 17-20 CVO

Replacement piston rings engineered for reliable sealing and oil control. 🔧

Includes top compression rings (barrel face) and second compression rings (Napier), coated using a PVD process to enhance wear resistance and assist heat transfer between the piston and cylinder wall.

A reverse twist ring combined with a taper-machined ring face duplicates the OD bottom-side scraping edge of a positive twist torsional ring, promoting side sealing that prevents oil from being forced under and behind the ring for improved oil economy.

Oil control rings are a three-piece flex vent design: the three-piece arrangement allows rails to be manufactured with a small cross-sectional area for better conformability to the bore, while four steel rails and two expanders provide uniform pressure and positive oil control.

Made in the USA. Includes enough rings for two pistons; two rings per groove except for the rails, which use two rail rings per one expander.

Kit includes:

• 2x Top compression rings
• 2x Second compression rings
• 2x Expander rings
• 4x Steel rails