Fore Carbon – Mavic

At Mavic, the connection between the spokes and the carbon rim does not rely on conventional drilling. Fore Carbon technology uses metal inserts embedded in the carbon during moulding, which keeps the upper bridge of the rim completely intact. This system is found on the flagship models of the range, notably the Cosmic Ultimate 45, Cosmic SLR 45 and Cosmic SL. This article details how Fore Carbon works and its practical consequences for the stiffness, airtightness and weight of the wheel.

What is Fore Carbon?

The problem with conventional drilling

On a conventional carbon wheel, each spoke is attached to the rim via a nipple passing through a hole drilled in both bridges of the rim (lower and upper). This double drilling weakens the structure and requires rim tape to ensure airtightness in a tubeless set-up.

The Fore Carbon principle

With Fore Carbon, threaded metal inserts are integrated directly into the layup of the rim’s lower bridge during the moulding of the carbon profile. The spokes screw directly into these inserts. The upper bridge, the one in contact with the tyre, is never drilled. It remains continuous, which ensures native airtightness without any rim tape.

Comparison with Fore Alu

The principle is the same on Mavic’s aluminium rims (Fore Alu technology), but the process differs: on aluminium, a thread is cut at the same time as the lower bridge is drilled, with the spokes screwing directly into the wall. On carbon, it is the co-moulded metal insert that plays this role, because carbon fibre cannot be threaded directly.

The practical advantages of Fore Carbon

1. Increased rim stiffness

By keeping the upper bridge intact and undrilled, the rim retains a continuous closed section. This tubular structure is mechanically more resistant to deformation than a rim whose bridge is weakened by 20 to 24 holes. The result is greater lateral stiffness, noticeable when accelerating and cornering.

2. Native tubeless without rim tape

The absence of holes in the upper bridge means the rim is airtight by design. There is no need for rim tape, a component that weighs around 30 g per wheel, ages, can come unstuck and cause pressure loss. Tubeless set-up is therefore simpler and more reliable over time.

3. Weight saving

Doing away with rim tape saves around 30 g per wheel (i.e. 60 g per pair). It is a direct mechanical gain, with no compromise on the structure, since it results from removing a component that has become unnecessary.

4. More stable assembly

The spoke-rim interface via a co-moulded insert offers very uniform anchoring. Mavic claims a spoke-rim connection zone designed for more stable assembly and more consistent spoke tension, which contributes to the wheel’s precision and responsiveness.

Which wheels feature Fore Carbon?

Fore Carbon is used across Mavic’s entire carbon road range:

• Cosmic Ultimate 45 Disc – the absolute top of the range (45 mm depth, 1,255 g a pair, R2R carbon spokes)
• Cosmic SLR – the performance model with ceramic bearings and Adaptive Lay Up (45 mm depth, around 1,480 g)
• Cosmic SL – the mid-range carbon line (40 and 65 mm depths)

Conclusion

Fore Carbon is one of the most fundamental technologies in Mavic’s carbon offering. By integrating the spoke anchoring right from the rim moulding stage, Mavic eliminates the need for rim tape, increases stiffness and makes tubeless set-up simpler for the long term. It is a particularly relevant approach for cyclists who want a reliable tubeless system without extra maintenance, and who value the lateral stiffness of their wheels. Other brands offer comparable solutions (co-moulded inserts at Zipp, for example), but Mavic is one of the few manufacturers to deploy it across its entire carbon range.