Spoke architecture addresses the asymmetric tension loads inherent in modern rear wheels. Cassette width pushes the drive-side flange inward, creating dramatic tension differentials that conventional symmetric lacing cannot resolve effectively. Shimano's OPTBAL system uses a 2:1 spoke ratio, positioning 16 spokes on the drive side against 8 on the non-drive side. This configuration balances tension across both flanges, extending spoke fatigue life while maintaining the lateral rigidity that prevents flex during hard cornering and sprint efforts. All 24 spokes use straight-pull, bladed stainless steel construction with external aluminum nipples for accessible tension adjustment without tire removal.

The 36mm carbon rim prioritizes weight reduction at the outer circumference, where mass contributes most significantly to rotational inertia. At 730 grams total, the C36 rear combines this lightweight rim with hub technology that transforms climbing into a more direct exchange between effort and speed. The D2 rim profile maintains aerodynamic relevance despite the conservative depth, with wind tunnel testing confirming drag reduction across yaw angles from 0 to 15 degrees. External width measures 28mm, creating efficient airflow transition when paired with 26-30mm tires. Internal width of 21mm supports tire widths from 25mm to 32mm with the hooked bead design enabling tubeless setup.

Hub internals feature Shimano's cup-and-cone bearing system with CBN-coated races and loose stainless steel ball bearings. This architecture demands periodic maintenance but delivers complete serviceability and preload adjustment precision that sealed cartridge bearings cannot replicate. The Center Lock disc mount accepts standard Shimano rotors, and the 12x142mm thru-axle spacing follows current disc road conventions. The wheel ships with tubeless tape and valve pre-installed. Paired with the 620-gram front wheel, total system weight reaches 1350 grams, though the C36 rear also pairs logically with shallower front profiles for riders prioritizing crosswind stability. At 730 grams with Dura-Ace hub quality and carbon construction, the C36 rear delivers the acceleration response that makes climbing feel less like resistance and more like conversation.