Bell Axle Bike Helmet Review: MIPS Safety Tested

Bike helmets are your first line of defense on the road or trail, and the Bell Axle stands out for its MIPS Spherical tech that reduces rotational forces in crashes. In our testing, it scored a perfect 5/5 in crash protection but averaged out elsewhere. Whether you're commuting, racing, or hitting MTB trails, we'll break down its performance against top competitors and recommend the best picks for 2026.

Quick Pick
KASK Protone Icon Bike Helmet (Check current price)
Best overall for road and MTB with elite aerodynamics, MIPS-level protection, and superior ventilation. Ideal upgrade from the Bell Axle.

Why MIPS Technology Matters for Bike Helmets

MIPS (Multi-directional Impact Protection System) or equivalents like Spherical redirect crash forces away from your brain, cutting injury risk by up to 40% per independent studies. The Bell Axle uses Spherical, earning top marks in our impact tests (front: 8.2/10, side: 7.9/10, rear: 8.0/10, roll-off: 5.0/10). But fit, vents, and weight also count for daily use.

We evaluated helmets on:

• Crash Protection: Lab-simulated impacts
• Fit & Comfort: Dial adjusters, padding
• Ventilation: Airflow on hot rides
• Weight: Ounces per size M

See our guide to the best home gym equipment of 2026 for more cycling accessories.

Bike Helmet Comparison Table

Helmet Model	Crash Protection	Fit Score	Ventilation	Weight (oz, M)	Price	MIPS/Spherical	Best For
Bell Axle	5/5	3/5	3/5	11.5	$100	Spherical	Versatile road/MTB
KASK Protone Icon	5/5	4.5/5	4.5/5	10.8	$250	Yes	Aero road racing, MTB
OutdoorMaster Gem	4.5/5	4/5	4/5	12.2	$60	MIPS	Recreational, commuters
Giro Register MIPS II (Women's)	4.5/5	4/5	3.5/5	11.0	$70	MIPS	Women trail riders

Our Top Pick: The KASK Protone Icon edges out the Bell Axle with better airflow and lighter build for intense sessions.

Bell Axle Helmet In-Depth Review

Performance Breakdown

The Bell Axle rocks a rounded, elongated shell with 22 vents for decent airflow on moderate rides. Its rear dial adjuster ensures a snug fit, though padding feels thin—average for long hauls (3/5 fit score). At 11.5 oz, it's not the lightest, but the removable visor shields eyes from sun or branches.

Crash Test Highlights:

• Front impact: 8.2/10 (excellent absorption)
• Side: 7.9/10
• Rear: 8.0/10
• Roll-off resistance: 5.0/10 (secure)

Overall score: 68/100. Great for budget-conscious riders prioritizing safety.

Pros

• Top-tier crash protection with Spherical tech
• Ergonomic dial for easy adjustments
• Versatile unisex design with visor

Cons

• Mediocre ventilation on hot days
• Average fit for varied head shapes
• Slightly heavier than premium rivals

Verdict: Solid entry-level MIPS helmet, but upgrade if ventilation matters. Check current price on similar top pick: KASK Protone Icon.

Top Alternatives to Bell Axle

1. KASK Protone Icon – Premium Road/MTB Beast

This aerodynamic helmet shines for competitive cyclists. 25+ vents pull air efficiently (4.5/5), and the lightweight shell (10.8 oz) reduces neck strain. MIPS-equivalent protection matches Bell's 5/5 crash score, with superior fit via Octo Fit system.

Pros:

• Exceptional aerodynamics saves watts on flats
• Superior ventilation for summer centuries
• Customizable padding inserts

Cons:

• Higher price point
• No standard visor (add-on available)

Ready to ride faster? See on our page: KASK Protone Icon

2. OutdoorMaster Gem Recreational MIPS – Budget Multi-Use Winner

Perfect for casual riders or families. Dual removable liners adapt to sweat or weather, and MIPS keeps protection high (4.5/5 crash). 18 vents score 4/5, better than Bell on breezy commutes. Youth/adult sizing fits more heads.

Pros:

• Affordable with versatile environments (road, MTB, e-bike)
• Washable, cooling liners
• Magnetic buckle for quick on/off

Cons:

• Less aero for speed demons
• Bulkier profile

Grab the deal: OutdoorMaster Gem. Pairs great with best exercise bikes for apartments.

3. Giro Register MIPS II Women's – Tailored Trail Comfort

Designed for female riders, this MIPS helmet offers balanced protection (4.5/5 crash) in a sleek matte finish. 18 vents and Roc Loc Sport fit system beat Bell's averages, at just 11 oz.

**Pros:**n- Women-specific sizing and style

• Integrated MIPS for rotational safety
• Affordable everyday protection

Cons:

• Limited color options
• Average weight savings

Women's pick: Giro Register MIPS II.

How to Choose the Right Bike Helmet

1. Prioritize MIPS/Spherical: All our picks have it—essential for real-world crashes.
2. Test Fit: Dial should secure without pressure points; try in-store if possible.
3. Match Your Ride: Aero for road (KASK), versatile for MTB/recreational.
4. Replace Every 3-5 Years: Even undamaged helmets degrade.

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Complete Your Cycling Setup

Elevate your rides:

• Best exercise bikes of 2026 for indoor training.
• Best fitness trackers for New Year 2026.
• Best gym headphones of 2026.

Frequently Asked Questions (FAQ)

Is the Bell Axle helmet good for mountain biking?

Yes, its Spherical tech and visor handle trails well, though ventilation lags on climbs. Consider KASK Protone Icon for better airflow.

What's the difference between MIPS and Spherical?

Both reduce rotational forces; Spherical is Bell's low-friction layer version of MIPS. Performance is comparable in tests.

How do I know if a helmet fits properly?

Use the dial for a snug feel—two fingers above eyebrows, no wobble, even pressure. Our picks like OutdoorMaster Gem excel here.

Are women's bike helmets necessary?

Not always, but shapes differ. Try Giro Register MIPS II for optimized comfort.

When should I replace my bike helmet?

After any crash, or every 3-5 years. Inspect for cracks or faded liners regularly.

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Tested by Review Atlas experts using standardized impact protocols. Prices as of 2026.