Race Face Cinch Direct Mount Chainring 30T Green CheckoutTitle=WTB Trace Grips - Black Bearing race material is AISI

Bearing race material is AISI 52100 chrome bearing steel hardened to Rc 60-65

and premium SKF-sealed bearings for long-lasting durability and glide

}SRAM Force 2x Chainring Kit - 46/33t 2x12-Speed 8-Bolt Direct Mount Black E1

but only slightly harder than silica

Race Face Cinch Direct Mount Chainring 30T Green CheckoutTitle=WTB Trace Grips - Black Bearing race material is AISIRaceFace Narrow Wide Chainring: Direct Mount CINCH 30t Green. Narrow wide chainrings compatible with Race Face CINCH system cranks. Direct mounting allows an easy switch between rings and spiders. Compatible with 9 10 11 and 12 speed (excluding Shimano 12 speed chains) Narrow Wide tooth profiling ensures consistent chain retention Lockring installed removed with ISIS BB tool Stiff 4mm plate thickness to transfer loads without flexing TECH SPECS Ring