Sidi AERON Black size 42.5 offers a precise half-size fit for smooth XC riding, combining race focus with confident control.
The Sidi AERON Black MTB cycling shoes size 42.5 are designed for riders who need a more precise fit than standard full sizes provide. The half-size construction improves foot positioning, stability and comfort during long XC races and marathon MTB rides.
The ripstop upper with rubber reinforcements protects the foot on technical terrain while maintaining a lightweight, race-focused silhouette. Dual NUUN 001C aluminum dials allow fast and accurate fit adjustment on the move. The Firmor X internal support system stabilizes the foot during climbs, accelerations and high-cadence efforts.
The UNUM Ergo anatomical tongue distributes pressure evenly to reduce hot spots on long rides. A full carbon X2FC outsole with stiffness index 11 ensures efficient power transfer, while rubber inserts provide added traction on steep and slippery sections. The tool-free adjustable heel cup allows the Sidi AERON Black 42.5 to be precisely tuned for confident, race-ready performance.
Technical specification:
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Model: Sidi AERON
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Size: 42.5
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Colour: Black
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Upper: Ripstop material with rubber reinforcements
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Closure: Dual NUUN 001C aluminum dials
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Fit system: Firmor X + tool-free adjustable heel cup
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Tongue: UNUM Ergo anatomical
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Outsole: X2FC full carbon with rubber inserts
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Stiffness index: 11
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Cleat adjustment: Wide adjustment range
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Replaceable parts: Heel cup, NUUN 001C dials, studs
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Intended use: MTB / XC
Shipping:
We ship within Poland, across the entire European Union, and worldwide.