Rotor Q-Rings' 110x4 Asymmetric BCD Inner Rotor is features black anodized laser etched aluminum. It's compatible with Aldhu 3D+ cranks and 4-bolt Shimano cranks. When mounted to Rotor's Aldhu 3D+ spider, they can be adjusted in 1-degree increments. When mounted to Shimano cranks, they are set to the intermediate position OCP #3 - the most commonly used position.
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by BBB (The 3 B''s)
I'm going to recommend Road Oval rings (at least inner) to any who will listen. Already in use on my MTB's, so smooth and efficient when climbing. Noticeable difference.
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A guide to understanding and calculating bicycle gear inches.