Argon 18 E-117 105 Di2

The E117 carbon frame is Argon 18's dedicated triathlon platform, engineered specifically for multisport demands rather than adapted from a road design. Its 78-degree seat tube angle — consistent across all five sizes — positions the rider forward over the bottom bracket, shifting load away from the quads and hamstrings during the bike leg. That preservation matters most at the bike-to-run transition, where poor saddle positioning accumulates as muscle fatigue over distance. Argon 18 extends this thinking into the frame geometry itself through the Argon Fit System: bottom bracket drop, chainstay length, and wheelbase are adapted per frame size, and the fork is custom to each size to prevent toe overlap. A rider on a size XS — designed for a 47-50cm rider — gets geometry proportional to their body, not a compressed version of a larger frame. The 3D System handles front-end fit at the head tube, allowing stack height adjustment without a fork swap and without compromising steerer stiffness — practical for a triathlete still dialing in position between events. Cables are fully integrated throughout the frameset.

Shimano 105 Di2 handles the drivetrain. The R7150 derailleurs run on the same electronic architecture as Dura-Ace and Ultegra — identical shift logic, multi-shift capability, and junction box electronics, with a performance gap that narrows considerably once you're on the road. The 52/36 chainring setup and 11-34 cassette give useful range across sprint-distance flat courses and longer events with…