HASTINGS Replacement Piston Rings — 3.875" bore, standard – 12-17 Dyna, 10-17 Touring, 03-06 CVO, 09-17 Trike, 12-17 Softail

Replacement piston rings engineered to restore compression and oil control for worn engines. 🔧

• Includes top compression rings, second compression rings, and oil control rings for two pistons.
• Top compression rings are barrel face to improve sealing and heat transfer between piston and cylinder wall.
• Second compression rings are Napier style with a reverse twist and taper‑machined face that duplicates the scraping action of a positive twist ring.
• Oil control rings are a three‑piece flex vent design with two expanders and four rails to provide uniform pressure and positive oil control.
• Promotes side sealing to prevent oil from being forced under and behind the ring, improving oil economy.
• Includes two rings per groove except where rails use two rails per expander, and includes enough rings for two pistons unless noted.
• Made in the USA.

Designed to control combustion gases and assist the piston in transferring the energy of expanding gases to the crankshaft for reliable engine performance.