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Description
Engineered for the Hardest Lines
The Sidi 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.
Designed for Every Foot
Millennium Fit is Sidi's latest innovation in cycling shoes. The new generation of Sidi shoes are designed with a slightly wider shape, offering enhanced comfort and better adaptability for more riders.
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
Specs:
- 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
Free Exchanges: This product qualifies for free exchanges within the first 60 days after order. We'll cover the shipping both ways for continental US customers (not applicable for AK, HI, APO, FPO) if you need a different size and/or color of this product. Returned product must be in new condition with all labels and packaging. Free exchanges apply only for product in stock or available for backorder.
B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. Cleats may have been mounted leaving minor marks on the soles. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.
Size Chart
Specifications
Cleat Compatibility: 2 Hole | |
Width: Regular | |
Black - 42 | Mfg PartNum: 000MCAERONBLACK-42 |
Black - 43 | Mfg PartNum: 000MCAERONBLACK-43 |
Black - 44 | Mfg PartNum: 000MCAERONBLACK-44 |
Black - 45 | Mfg PartNum: 000MCAERONBLACK-45 |
Black - 46 | Mfg PartNum: 000MCAERONBLACK-46 |
Black - 47 | Mfg PartNum: 000MCAERONBLACK-47 |
Ice White - 42 | Mfg PartNum: 000MCAERONICEWHITE-42 |
Ice White - 43 | Mfg PartNum: 000MCAERONICEWHITE-43 |
Ice White - 44 | Mfg PartNum: 000MCAERONICEWHITE-44 |
Ice White - 45 | Mfg PartNum: 000MCAERONICEWHITE-45 |
Ice White - 46 | Mfg PartNum: 000MCAERONICEWHITE-46 |
Ice White - 47 | Mfg PartNum: 000MCAERONICEWHITE-47 |
Reviews
Let me start with the cosmetics - it's a great looking shoe, has robust construction, tough fabrics, and delivers the SiDi flavor in an updated gravel design. Also, the carbon sole is nice and rigid - tread design is superior to SiDi's past XC shoes.
That being said, the shoe does present some disappointments that I'm removing a star or two for.
I knew before buying these that the Aeron has SiDi's new "Millennium Sizing" which indicates a roomier toe box. Unfortunately, it's much more than toe box room - it's the entire shoe. It really threw me off. I have worn SiDi forever in a size 43EU; currently wear the Wire2S for road in that size. I purchased these Aeron shoes in 43EU and they were way too big. Returned them for the 42EU which fit well.
What was baffling was the sizes on the box for both Wire2S and Aeron:
The EU/US sizes on the Wire 2S shoe box: EU 43 / US 8.8
The EU/US sizes on the Aeron shoe box: EU 42 / US 9
The size inconsistency is frustrating - so be sure to try them on - or just order one size down if you already wear SiDi shoes without the "Millennium Sizing". I'm not sure what SiDi was thinking here.
The NUUN dials are slightly easier to work with than Tecno-3, but anodized aluminum was a bad choice. Since there's no indicator for what direction to close them (touch or visual) - once opened if you close them the wrong way they nick the aluminum. Already have a few small marks that expose the raw aluminum silver color. For this price point I expect higher quality materials for this closure system.
Last but not least, the locked-in feeling and heel support I've historically gotten from Sidi shoes is just not present in this shoe. Particularly the Aeron's heel cup; it's not sufficient. The tongue padding I'm used to on SiDi shoes is almost nonexistent in the Aeron, which is a concern for long rides. The Wire2S has a superior feel and fit - and the Aeron should be delivering that as gravel shoe. It unfortunately does not.
Mechanic's Corner
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