They have a slight flange on the inside

If you'd prefer to run a standard Shimano HG cassette

420 710845729577 Revelation 2014-16 - Solo Air - A3 00

Soft / firm: Soft rubber compound developed and manufactured in Germany

The Ultimate

Fox Flexair Youth Shorts - Youth L-26 - Steel Grey PLP|EMTB Optimised They have a slight flangeThe Fox Flexair Youth Shorts feature a durable stretch fabric with body mapped perforations for maximum airflow. The race ratchet closure provides a secure fit and quick on the fly adjustments Features: Secure zippered hand pockets TruMotion all way stretch fabric offers a full range of motion increasing mobility Body mapped laser perforated areas on front and back panels increase airflow keeping you cool Durable Water Repellent finish sheds moisture,