A one-piece design, which keeps the integrative of the carbon rim structure and also provides aerodynamic effect to the wheel set. It is truly a perfect composition of structure strength, beauty, light-weight and smoothness. The exquisite single driving unit with figures of: 1. reversed spoke angle design change the operation mode to simulate high profile and provide with high inertia; 2. aerospace class high modulus carbon fiber; 3. optimized lamination design; 4. precisely machined with low friction; 5. inertia gained by precisely planed rim / spokes / hub weight distribution; 6. blended wheel design that bring high strength and stiffness to the wheel.