HASTINGS Replacement Piston Rings — +0.010" piston, 4.000" bore, 114 cu in – 18-21 Softail, 19-21 Touring, 19-21 Trike, 17 CVO

Includes top compression rings, second compression rings, and oil control rings. 🔧

Top compression rings feature a barrel face for improved sealing and reduced wear.

Second compression rings use a Napier design with a reverse twist and taper‑machined face to replicate the OD bottom side scraping edge of a positive twist torsional ring.

Oil control rings are a three‑piece flex vent design with rails and expanders to assure positive oil control and better oil economy.

The three‑piece design allows rails to be manufactured with a small cross sectional area for superior conformability to the bore and uniform pressure through the rails and expanders.

PVD (Physical Vapor Deposition) coating enhances durability and helps transfer heat between the piston and cylinder wall.

Controls combustion chamber gases so the piston can transfer expanding combustion energy to the crankshaft.

Includes enough rings for two pistons; two rings per groove except for rail grooves. Made in the USA.