2025 Sidi Aeron Millenium

Engineered for the hardest lines

AERON redefines XC performance through advanced construction and precision fit. The ripstop upper with rubber bumpers offers protection without added weight, while dual NUUN 001C dials and internal Firmor reinforcement ensure secure, responsive support. A fast-adapting instep and UNUM tongue deliver a pressure-free fit, complemented by a tool-free heel adjuster for fine-tuned stability. The sole, with stiffness index 11 and generous rubber coverage, offers powerful traction and efficient energy transfer.

Technical Specifications

• Upper : Ripstop fabric with rubber bumpers - lightweight, tear-resistant, and protective
• Closure : Dual NUUN 001C aluminum dials - aerodynamic, precise, and secure fit control
• Instep : Adaptive instep linked to dials - molds to foot for a personalized fit
• Fit System : Firmor X internal support + tool-free heel adjuster - enhanced foot stability and alignment
• Tongue : UNUM Ergo anatomical tongue - relieves pressure for consistent comfort
• Outsole : X2FC full carbon with rubber lugs - stiffness index 11, built for grip, impact support, and efficient power transfer
• Cleat Setup : Independent cleat adjustment for personalized positioning
• Replaceable Parts : Heel pads and dials

Impact Specifications

Sidi shares, supports, and applies within its sphere of influence the Ten Fundamental Principles of the Global Compact and actively contributes to the achievement of the United Nations' Sustainable Development Goals (SDGs).

Sidi Sport commits to setting its short and long-term greenhouse gas emissions reduction targets. The SBTi's goal is to halve greenhouse gas emissions by 2030 and achieve net zero by 2050.

Product Benefits

Stability Meets Airness

For XC Riders Who Want Lateral Stability in a Lightweight, Ventilated Structure

Toughness Made Light

Ripstop and Rubber for Rugged Protection

Tailored Fit Made Simple

Adaptive Instep Connected to Dials

Locked In

Heel Adjuster and Firmor X Stability

Features

// STABILITY MEETS AIRNESS

Made for XC riders seeking lateral stability in a lightweight, ventilated structure that ensures consistent climate control.

// TOUGHNESS MADE LIGHT

Ripstop® upper with rubber bumper offers high tear resistance and protection in a lightweight, durable structure.

// TAILORED FIT MADE SIMPLE

Adjustable instep connects to NUUN dials, shaping to the foot with an internal system for easy, secure fit.

// LOCKED IN

Heel adjuster and Firmor X combine to stabilize the foot, providing a secure, unified fit through every pedal stroke.

// AERO-BUILT. POWER-TIGHT. SIDI PRECISION

NUUN 001C is a compact, aero aluminum dial with SIDI's handle system for fast, precise tension and maximum hold.

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