SMC Radius Rings

SMC Radius rings are rounded metal rings used to build friction savers, adjustable bridges, and anchors in tree climbing systems. A ring gives rope a smooth surface to run over and a simple connection with no moving parts.

Where rings fit in a climbing kit

Rings show up all over a modern climbing system. A pair on a length of rope makes a ring friction saver. A ring on a rope bridge lets your climbing system slide side to side as you work. A ring at an anchor gives you a smooth redirect without a carabiner gate in the way. Because there is no gate to open and nothing to rotate, rings are simple and easy to check.

Pick the size and strength that suit the job and the other hardware they meet. See all sizes in our rings section.

Ring size changes how rope behaves. A larger radius is gentler on the line and lets friction hitches and hardware pass more easily, while a smaller ring is lighter. Match ring size to the rope and the other hardware in the system.

Inspection and limits

Check rings before each use for grooves worn by rope, burrs, cracks, and deformation. A groove that catches your fingernail is a reason to retire the ring, because a sharp edge will cut rope fast.

Use rings only for the loads and configurations the maker rates them for, and keep them from being side-loaded against a stem. Life-support use must follow the maker's instructions and ANSI Z133 practice.