Teravail Fluent Mountain Rim - Rear 29" Disc Brake Matte Carbon 28HTeravail Fluent Mountain Rim Rear 29" Disc Brake Matte Carbon 28H. Fluent is Teravails carbon mountain bike rim. Its designed for a light and lively ride feel with the durability to hold up to trail rides and bikepacking adventures alike and its backed by a lifetime warranty. Fluent rims are engineered for a seamless experience with Teravails wide selection of MTB tires for easy tubeless setup and optimized tire profiles so you can ride dirt your way.