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Head-to-head · Best Bike Helmets

Bell Formula LED MIPS Ghost vs Giro Aries Spherical

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

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The short answer

Bell Formula LED MIPS Ghost comes out ahead by a narrow margin (4.5 vs 4.4). The gap is mostly about commuters who need high visibility features without sacrificing safety — read the strengths below before deciding.

Bell Formula LED MIPS Ghost
Higher ratedRanked #3 in Best Bike Helmets
Bell Formula LED MIPS Ghost
6 sources1 derived$83.97as of Oct 2

Consumer Reports awarded the Bell Formula LED MIPS Ghost an overall score of 86, praising its balance of safety and functionality. Cycling Weekly noted that the helmet provides a secure, head-hugging fit with excellent ventilation from its 19 vents, though they flagged its weight as a drawback compared to lighter competitors. 220 Triathlon highlighted how integrating the MIPS technology into the retention system maintains a low profile while offering multi-directional impact protection. This all-rounder is best suited for riders seeking high visibility and reliable safety features without breaking the bank, whereas those prioritizing ultra-lightweight performance might look elsewhere.

Strengths
  • — Integrated Mips slip plane reduces rotational forces while keeping weight and profile down by being built into the retention system.
  • — 20-lumen rear LED is unobtrusive, highly visible, and rechargeable via a micro USB port included with the helmet.
  • — Fusion In-Mold polycarbonate shell creates a sturdier, slicker, and more durable finish than standard helmets.
Watch-outs
  • — Weight is heavier than premium aero options, with sources citing figures between 285g and 303g depending on size.
  • — Straps may require cutting down to fit properly for some users despite having No-Twist Tri-Glides.
$83.97 · Check Price on AmazonFull review →
Giro Aries Spherical
Ranked #5 in Best Bike Helmets
Giro Aries Spherical
8 sources1 derived$21.95as of Oct 2

The Giro Aries Spherical achieves Virginia Tech’s highest safety ranking across all categories, utilizing a dual-shell ball-and-socket design to mitigate rotational impact forces more effectively than standard liners. GearJunkie found the helmet offers best-in-class ventilation through twenty-four vents that manage heat efficiently during high-temperature rides, while Cyclist magazine noted its DryCore system channels sweat away from the eyes with an internal silicone bead in the brow pad. However, Cyclist magazine measured a weight of 282 grams for a size medium, making it heavier than some direct competitors despite its premium price point. The product fits riders prioritizing maximum safety and cooling performance who can accommodate the extra mass and higher cost, but those seeking ultralight options or flawless build quality should look elsewhere.

Strengths
  • — Virginia Tech independent safety lab ranked the Giro Aries as its #1 rated helmet across road, mountain bike, and urban categories.
  • — Spherical MIPS technology uses a dual-shell ball-and-socket design to mitigate rotational impact forces rather than relying on a standard plastic liner.
  • — GearJunkie found the helmet offers best-in-class ventilation with 24 vents that effectively manage heat during high-temperature rides.
Watch-outs
  • — Cyclist magazine noted a measured weight of 282 grams, making it heavier than some direct competitors despite its premium price point.
  • — The helmet is expensive.
$21.95 · Check Price on AmazonFull review →

Derived means the reviewer published no score, so one was inferred from their written verdict. Everything else is a number the publisher printed. How we rank.

How they stack up

Bell Formula LED MIPS Ghost

The Bell Formula LED MIPS Ghost distinguishes itself from the Giro Aries Spherical and Smith Signal by integrating a rechargeable rear LED for enhanced visibility, a feature absent in those models. While it offers robust safety via integrated MIPS, its weight of 285g-303g makes it significantly heavier than the ultralight Trek Velocis Mips (240g) and slightly heavier than the Smith Signal (256g).

Giro Aries Spherical

The Giro Aries Spherical offers superior ventilation with 24 vents compared to the Bell Formula's 19 and the Met Downtown's 17, making it cooler for hot rides. Its Spherical MIPS dual-shell design provides a different rotational impact mitigation approach than the standard MIPS liners found in the Smith Signal and Trek Velocis Mips.

Specs side-by-side

SpecBell Formula LED MIPS GhostGiro Aries Spherical
Weight285g265g - 282g
Ventilation1924
Safety CertificationUS CPSCCE EN 1078
Fit SystemFloat Fit LED with MIPSRoc Loc 5+ Air
Shell MaterialFusion In-Mold Polycarbonate—
Safety TechnologyMIPS EvolveSpherical MIPS
SizeS, M, LS, M, L
VisorIntegrated visorIntegrated visor
Material—Plastic
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