Nolan X-804 RS Ultra Carbon Helmet Lesmo White/Black/Grey 363

Crafted entirely from ultra-carbon fibre and designed in Brembate di Sopra, Italy, the Nolan X-804 RS Ultra Carbon Lesmo 363 is one of the most precisely engineered full-face helmets available to road and track riders today. The Lesmo colourway — a composed palette of white, black and grey — carries the DNA of Italian circuit racing into a shell that weighs just 1,420 g ±50 g, demonstrating exactly what a commitment to premium materials can achieve.

Key Features

• Ultra-carbon fibre shell with 4 outer shell sizes and 6 EPS liner densities for a precise fit at every head circumference
• ECE 22.06 homologation and NERS (Nolan Emergency Release System) for race-grade safety on road and track
• Ultra-Wide visor with 97° vertical and 225° horizontal field of view, scratch-resistant coating, and included Pinlock inner lens
• RAF (Racing Air Flow) ventilation system, wind-tunnel optimised, with 1 chin inlet, 1 central front inlet, 2 upper inlets and integrated rear spoiler exhaust channels
• RAS (Racetrack Aerodynamic Spoiler), developed via CFD simulation, keeping the helmet planted and stable at triple-digit speeds
• LAF (Liner Adjustable Fitting) and LPC (Liner Position Control) interior systems for millimetre-accurate personalisation, with eyewear-adaptive cheek pads

Ultra-Carbon Construction

The X-804 RS Ultra Carbon shell is the foundation that separates this helmet from the competition. Carbon fibre woven into Nolan's multi-layer Ultra-Carbon construction delivers exceptional rigidity and impact resistance while keeping mass to a minimum. Four distinct outer shell sizes ensure that whether you ride in XXS or XXXL, the geometry of the shell matches your head rather than the padding compensating for a mismatch — a detail that matters enormously over a long track session or a full day on the road.

Inside, Multi-Density EPS absorbs and disperses impact energy across multiple layers, and the Doppel-D double-ring closure meets the exacting retention standards demanded by serious racing use. Every structural element has been produced and assembled in Italy, reflecting decades of motorsport manufacturing expertise.

Racing Air Flow Ventilation

At sustained high speed, helmet ventilation is not a comfort feature — it is a performance requirement. Nolan's RAF system was developed in the wind tunnel specifically for the X-804 RS. A chin-level inlet with an anti-fog function draws fresh air across the face port, a central front inlet delivers a direct stream to the crown, and two upper diffuser inlets spread airflow evenly across the interior. Spent air exits through twin side exhaust channels and a rear outlet integrated cleanly into the RAS spoiler. A mesh inner cap promotes continuous air circulation across the full liner, keeping core temperature in check even at race pace.

Visor Technology

The Ultra-Wide visor spans 97° vertically and 225° horizontally — a field of view that eliminates blind spots on track where situational awareness is critical. The lens is scratch-resistant and ships with a Pinlock inner shield that can be adjusted from outside the helmet, preventing fogging during temperature transitions. The Safety Visor Lock System (SVLS) keeps the visor firmly seated at high speed, and the track-only dark-tinted visor included in the box features tear-off preparation for circuit use. A precision security screw mechanism allows fine visor alignment adjustment without tools.

Interior Comfort and Fit

The X-804 RS Ultra Carbon Lesmo pairs race-level protection with a refined interior that disappears beneath you. The LAF system allows riders to fine-tune liner thickness to their exact head shape, while LPC provides height adjustment of the crown liner for riders with longer or shorter head profiles. The 3D Steady Fit cheek pads are both removable and washable, and the EA (Eyewear Adaptive) system creates a channel for spectacle arms — a thoughtful detail for riders who wear glasses on track or on tour. The liner fabric combines premium Sakura polyamide — soft, robust and quick-drying — with carbon-fibre sections that aid thermoregulation and resist bacteria. A Camelbak hydration system port is pre-routed for endurance racing use.

RAS Aerodynamic Spoiler

The removable Racetrack Aerodynamic Spoiler was shaped using Computational Fluid Dynamics simulation to reduce turbulence at top speed, improve neck clearance in a racing tuck, and balance lift and downforce across the helmet profile. The result is a helmet that remains composed and neutral at speeds well in excess of 250 km/h — not a claim many helmets can substantiate with engineering evidence, but one the X-804 RS earns through its CFD-derived form.

Fitment and Compatibility

The Nolan X-804 RS Ultra Carbon Lesmo 363 is a universal full-face helmet suitable for all motorcycle types. It carries ECE 22.06 homologation for road use across Europe and is constructed to race-track standards for circuit days. The Eyewear Adaptive interior accommodates glasses wearers. It is not compatible with Nolan N-Com Bluetooth communication systems.

Specifications

Size Guide

Measure your head circumference 1 cm above the ears at the widest point to select the correct size. If you fall between two sizes, opt for the smaller for a secure race fit, or the larger for all-day road touring comfort.