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The WTB Frequency TCS (Tubeless Compatible System) i19 is the best of both worlds. It’s a lightweight cross country/ trail tire and is tubeless compatible. The UST compliant rim bead is shaped to help keep tires on rims better. WTB uses their “4D” drilling process which creates the optimal interface between spoke and rim. This exact angle reduces binding and the need for eyelets. To ensure strength and rigidity, WTB uses their I-Beam which was pioneered in 1994. I- Beam is a centrally located vertical support that counteracts spoke loads and provides torsional rigidity. In addition to the I-Beam, WTB embodies an additional band of aluminum to the sidewall that improves torsional, radial, and lateral strength.