Colnago V5Rs Disc Karbon Frameset VRWB

Weight Optimization and Production Techniques

Weight savings come from the combination of new lamination and production techniques. The first step involves defining and optimizing the carbon layup in crucial sections, thanks to FEM analysis. Once the carbon stacking sequence is defined, high-strength and stiffness prepregs are carefully positioned and combined on specific mandrels, then cured in molds. Using these mandrels, the uncured frame can be precisely preformed, placing each layer of carbon in its designed position and direction, even in complex joints and small radius sections. As a result, during the curing process, the fibers cannot move, maintaining the necessary direction to exactly support the stresses they are intended for. Therefore:

• There is no need to add extra material beyond the design, reducing weight.
• The final performance of the frame is more aligned with the calculations, increasing strength and stability.
• The overall quality and surface finish improve.

Aerodynamics

During the development of the Y1Rs, Colnago collaborated with Khalifa University (Abu Dhabi, UAE) and the Politecnico di Milano (Italy) to improve the CFD models used in the development of their products. The result has been an increase in model accuracy. The average difference between CFD measurements and actual measurements has decreased from 30% (according to Colnago's data, this number represents the current industry standard) to 15%. This model is now used in the development of all new Colnago bicycles, including the V5Rs.

Wind tunnel results: the results are presented for both the reference speed of 50 km/h, used in all comparisons as it is the reference speed for professional cyclists in breakaways or crucial race phases, and at 35 km/h, which approaches the average speed of amateur cyclists or professionals in mountain stages.

Frame Stiffness

Creating lighter frames and more aerodynamic tube profiles usually involves a compromise with frame stiffness. Once the preliminary frame design is defined and its aerodynamics evaluated, the positions and shapes of the joints have been optimized, and finally the carbon layup, using FEM before proceeding with physical prototypes. Thanks to FEM analysis, it is possible to simulate the behavior of the frame under specific load conditions. Different designs can be simulated to achieve the required performance.

• Optimization of the seat tube joints to improve pedaling efficiency.
• Reduction of the seat tube width for aerodynamics, requiring an in-depth study of shapes and lamination to avoid loss of stiffness and thus pedaling efficiency.
• The seat tube has been raised to increase the stiffness of the joint with the seat post.
• The transition from the seat tube to the bottom bracket has been modeled with optimal radii, and the same analysis has been conducted for the joint between the top tube and the bottom bracket.

Updated Racing Geometry

The geometry of the V4Rs has already been validated in major WorldTour races. All small updates have been made to make the V5Rs slightly more aggressive and efficient and to better fit modern riding positions:

• Two fork rakes (47 mm for sizes 420-510 and 43 mm for sizes 530-570). The goal is to reduce the trail, especially in smaller sizes and with larger tires that are becoming increasingly common, while maintaining greater uniformity across sizes. The updated trail makes the V5Rs more responsive in direction changes and quick maneuvers.
• Slightly greater HT and ST angles compared to the V4Rs, to accommodate a more forward and crouched position, optimizing aerodynamics and power transmission.
• Available with 2 seat posts (0 and 15 mm setback).
• Clearance for tires up to 32-622.