Felt IA 2.0 Race 105 Di2 Bike

The Felt IA 2.0 Race 105 Di2 Bike is the entry point into one of the most aerodynamically considered triathlon platforms available. The IA 2.0's defining feature is its curving integrated aero architecture — a distinct humpback carbon form that channels airflow while housing an integrated hydration and nutrition system directly inside the frame. Felt's wind tunnel testing shows the IA 2.0 is 4% faster than the original IA across the yaw angles riders encounter most on race courses, and it made headlines when Daniela Ryf rode it to victory at the Ironman World Championship. The Race 105 Di2 build brings this platform to a broader range of athletes at $6,899.

The drivetrain is Shimano 105 Di2 (R7150) — fully electronic shifting on a groupset that has proven capable at every level of competitive cycling. For triathlon in particular, Di2 matters: the SW-R9160 satellite shifters mount directly on the aerobars, so you can change gear without leaving your aero position. The 52/36t crankset pairs with an 11-34t cassette, covering a range that handles the sustained flats at Kona and hillier race venues alike. Wheels are Vision Metron SC 60 i23 — 60mm deep carbon clinchers that deliver meaningful aero performance without requiring a wheel upgrade on day one. TRP HD-T910D hydraulic disc brakes, designed to work with the Di2 system, provide consistent stopping power regardless of conditions.

What sets the IA 2.0 apart in the triathlon market is its integration. The humpback frame profile houses a 0.9L ThirstPac removable hydration reservoir inside the top tube, with a drink tube that routes to your aerobars. A quick-fill port allows you to top it off at an aid station without stopping. Sitting above that is the CalPac, a 0.2L nutrition storage compartment. This isn't a bottle cage adaptation — the system is engineered into the carbon frame geometry, optimized aerodynamically, and designed not to spill or slosh at race pace. On a long-course bike, that integration is the difference between staying aero and repeatedly sitting up to reach for a bottle.

Specs at a Glance

• Frame: UD Carbon
• Fork: UD Carbon
• Groupset: Shimano 105 Di2 R7150, 12-speed electronic
• Crankset: Shimano 105 R7100, 52/36t
• Cassette: Shimano 105 R7101, 11-34t, 12-speed
• Bottom Bracket: Shimano BBR60
• Shifters: Shimano SW-R9160 Di2 (aerobar-mounted satellite)
• Brakes: TRP HD-T910D Hydraulic Disc (Di2 compatible)
• Rotors: TRP TR140-25 Centerlock 140mm
• Wheels: Vision Metron SC 60 i23 (front and rear)
• Tires: Continental Grand Prix TR 700x25
• Stem: Felt IA 2.0 Carbon
• Aerobars: Felt IA 2.0 Carbon
• Seatpost: Felt IA 2.0 Carbon
• Saddle: Prologo Zero Tri PAS T 2.0 136
• Hydration: ThirstPac 0.9L integrated reservoir + CalPac 0.2L nutrition
• Sizes: 48, 51, 54, 56, 58cm
• Color: Glossy Black

Design Benefits

1. Integrated aero architecture — 4% faster than the original IA: The IA 2.0's humpback carbon form isn't a styling decision — it's a functional aero shape validated in wind tunnel testing. The curved silhouette is designed to interact with the rider's aero position as a combined system, and the result is meaningful across the yaw angles triathletes actually encounter during racing.
2. Shimano 105 Di2 with aerobar satellite shifters: Full electronic operation without moving to Ultegra pricing. The SW-R9160 shifters mount on the aerobars and allow gear changes without raising your body out of position — exactly how a triathlon bike's drivetrain should work. Twelve speeds and a wide 11-34t cassette give you the range to handle varied terrain.
3. ThirstPac + CalPac integrated nutrition system: The 0.9L hydration reservoir lives inside the top tube and feeds a drink tube to the aerobars. The quick-fill port means aid station refills take seconds. The 0.2L CalPac nutrition compartment sits on top. On a 140.6-mile race, keeping this system integrated into the frame — rather than mounted externally — keeps your aero profile intact through every mile.
4. Vision Metron SC 60 i23 carbon wheels: 60mm deep carbon clinchers on a purpose-built triathlon bike at this price point is a strong value proposition. The Metron platform is well-proven in long-course racing, and 60mm of depth delivers real aero benefit on the flat and rolling courses where Ironman-distance events are typically held.
5. Aggressive tri geometry across five sizes: Seat tube angles from 79.5° (48cm) to 77.5° (58cm) place you in a forward position that engages your glutes and preserves your running legs — the fundamental goal of triathlon-specific bike geometry. Five sizes ensure the fit can be dialed properly across a wide range of athletes.
6. TRP hydraulic disc brakes with Di2 integration: The TRP HD-T910D calipers are designed to work with Shimano's Di2 system via an adapter, providing consistent stopping power at 140mm rotor diameter. For long-course athletes who race in varied conditions, disc brakes eliminate the performance variability that rim braking can introduce in wet weather or after long technical descents.

Final Take

The Felt IA 2.0 Race 105 Di2 delivers the core IA 2.0 experience — integrated aero design, built-in hydration and nutrition, and a geometry purpose-built for Ironman-distance racing — with Shimano's electronic 105 Di2 drivetrain and Vision Metron 60 carbon wheels as the foundation. The same frame platform that Daniela Ryf rode at the Ironman World Championship, at a price point that makes the IA 2.0 accessible to athletes who don't need Dura-Ace numbers to race well. For triathletes committed to long-course racing and ready to invest in a frame designed specifically for that discipline, the IA 2.0 Race is the right place to start in the lineup.