The ROLLCii BCD104 chainring is fully CNC machined from chromoly steel, built for riders who value durability over the long run.

Compared to aluminum, chromoly steel resists wear far better, holding its shape and performance even after countless kilometers. And unlike typical stamped steel chainrings, full CNC machining provides greater stiffness and more direct power transfer, delivering a solid, confident feel with every pedal stroke.

It’s a chainring made for long-distance riding, bikepacking, and loaded adventures—where consistency, reliability, and peace of mind matter more than chasing grams.

For high-power use such as e-bikes, where drivetrains tend to wear quickly, chromoly steel simply lasts longer—making it a sensible material choice.