Inner chainrings wear at a different rate than outer rings because they spend less time under peak chain tension. When you notice skipping on the small ring or roughness during downshifts, you need a fresh inner chainring. The Campagnolo Record 12-speed inner ring mounts to the four-arm spider using a 112mm bolt circle diameter that works across both Record and Super Record cranksets. This cross-compatibility means you can use the same replacement ring whether you're running Record or Super Record, which wasn't always the case with earlier Campagnolo groups.

Campagnolo machines these rings from black anodized aluminum and incorporates symmetrical teeth that stabilize the chain during cross-chaining. The tooth profile uses X.P.S.S. technology, which calculates the angles where the chain engages and releases the ring through mathematical simulation. This design tested 25 percent faster shifting under load compared to previous designs. The teeth are sculpted for lateral stiffness and machined to match the 12-speed chain profile, so you get low friction with secure engagement.

The ring ships with four chainring bolts that secure it to the back side of the spider while the outer ring bolts to the front. Campagnolo pairs inner and outer rings in specific combinations for proper shifting: 34-tooth pairs with 50-tooth, 36-tooth with 52-tooth, and 39-tooth with 53-tooth. If you're replacing just the inner ring, match the tooth count to your existing outer ring. The 112mm bolt circle is shared between Record and Super Record for inner rings, but outer rings use a 145mm bolt circle that's specific to each group.