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Mahle plain piston ring set PC479 for a 4.5‑inch bore is a replacement plain ring kit supplied with Dykes, Napier and a CP20 HT ring as specified: .017in Dykes, 1/16in Napier, 3/16in CP20 HT. It’s sold as a complete plain ring set intended for cylinder rebuilds. This set lists the exact ring sizes and types for fitment, providing the core components needed for re‑ringing engines with a 4.5in cylinder bore.
Mahle Rings PC479 Fire Power 4.5in Bore x .017in Dykes 1/16in Napier 3/16in CP20 HT Plain Ring Set
