Middleburn Inner Hardcoat Chainring A special ceramic/PTFE coating is applied to the rings in place of the regular anodised finish. This has two benefits
- 10 times less friction & 4 times the wear resistance of a standard ring. Available only in certain sizes. Can be combined with Slickshift machining too. PTFE coating Less friction with increased wear Buy Middleburn Inner Hardcoat Chainrings from Chain Reaction Cycles, the worlds largest online bicycle store.