IA IAx | Advanced | Rival eTap AXS

The original Felt IA was one of the defining triathlon platforms of the mid-2010s and remained in service for an unusually long run, from its 2014 introduction through the final pre-IA 2.0 years. It was built around a deep-section, non-UCI frame shaped specifically for triathlon rather than time trial rule compliance, with a proprietary front-end and nose-cone treatment that gave the bike its distinctive silhouette. Key design elements of this generation included horizontal rear dropouts, a proprietary seatpost, and modular storage such as CALpac and BTSpac, reflecting an era when integrated nutrition and flat-kit solutions were becoming central to tri bike design but had not yet been fully molded into the frame itself.

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The later IA range was offered in several IAx Advanced complete-bike builds spanning mechanical, electronic, and wireless electronic drivetrains. The lineup included 105, 105 Di2, Rival eTap AXS, and Ultegra Di2 versions, giving buyers a clear progression from a more accessible mechanical setup to higher-end electronic options. That spread made the platform available to a broad range of triathletes without changing the underlying frame concept.