Time Trial Helmet GIRO AEROHEAD MIPS (NEW 2026) Size S (51–55 cm) Matte White

The GIRO AEROHEAD MIPS (NEW 2026) Size S (51–55 cm) Matte White is an aerodynamic time trial helmet engineered for racing and triathlon events. It combines a low-drag shell profile with integrated rotational impact protection to address both speed and safety. The Size S shell is designed to fit head circumferences from 51 to 55 cm and the Matte White finish provides a neutral, race-oriented appearance.

Advantages

The helmet reduces aerodynamic drag through a contoured shell shape and smooth surface, helping riders maintain higher speeds in time trials and triathlon bike legs. Integrated MIPS technology offers added protection against rotational forces during oblique impacts, while internal fit systems keep the helmet stable and correctly positioned during high-effort efforts. Ventilation and internal padding are balanced to provide comfort without compromising the aerodynamic profile.

Suitable for

• Time trial cycling races and individual pursuit events
• Triathlon bike legs where aerodynamic efficiency matters
• Competitive cyclists seeking a compact, race-focused helmet
• Riders with head circumference between 51 and 55 cm

When it may not be suitable

This helmet is optimized for aerodynamic performance and may be less suitable for riders who prioritize maximum ventilation on long, hot training rides. It is also focused on race use rather than casual commuting or urban cycling where multi-directional visibility and frequent on/off use are more important. Riders needing sizes outside the 51–55 cm range should consider other shell sizes.

Key specifications

• Intended use: time trial and triathlon racing
• Fit range: 51–55 cm head circumference
• Shell finish: matte white
• Impact protection: rotational protection system integrated
• Fit system: adjustable internal retention for secure positioning
• Ventilation: low-drag airflow design balancing cooling and aerodynamics

How to use

Place the helmet on the head so that the front edge sits just above the eyebrows and adjust the internal retention system until the helmet feels secure but comfortable. Fasten and adjust the chin strap so it sits snugly under the jaw, leaving enough room to fit one or two fingers between strap and chin. For time trial starts and bike transitions in triathlon, ensure the helmet is securely fastened before mounting the bike and re-check strap tension during warm-up. Replace the helmet after any significant impact or when fit components show wear.

What to consider before purchase

• Confirm head circumference falls within 51–55 cm for Size S
• Consider whether aerodynamic performance or ventilation is a higher priority for your typical rides
• Check compatibility with any race-specific equipment such as aero bars, eyewear, or helmet-mounted hydration systems

Usage recommendations

For best aerodynamic results, pair the helmet with a clean, fitted kit and maintain a steady, aero position on the bike. Regularly inspect fit straps and padding, and replace the helmet after a crash or if structural damage is suspected.