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Discover if the Giro Tyrant MIPS delivers top-tier protection for mountain biking. We break down crash scores, fit, ventilation, and compare it to leading alternatives like Giro's MIPS Agilis and Register models. Find the best helmet for aggressive trails with our expert insights and top picks.
Quick Pick 💨
Giro MIPS Agilis Helmet
Top choice for versatile MTB and road riding with superior MIPS tech. Excellent rotational protection and lightweight design.
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Mountain biking demands helmets that balance rugged durability, breathability, and cutting-edge safety. The Giro Tyrant MIPS, priced around $200, targets aggressive trail and enduro riders with its full-coverage shell and MIPS Spherical technology. This system uses a dual-layer liner to slash rotational forces by up to 40% in oblique impacts, based on independent lab data.
In our hands-on tests, the Tyrant scored a solid overall 68/100, shining brightest in rotational impact management (5/5 stars). It's not the lightest at 14.6 oz, but its adjustable Roc Loc Sport system ensures a snug fit across head sizes S (51-55 cm), M (55-59 cm), and L (59-63 cm). With 19 vents, it handles moderate climbs without overheating, though it lags behind ultra-vented competitors.
Whether you're shredding singletrack or hitting bike parks, here's our deep dive into performance metrics, real-world use, and how it stacks up.
We pitted the Tyrant against other high-performing MIPS-equipped helmets from trusted brands. Check this table for key specs and scores (out of 100 unless noted):
| Feature | Giro Tyrant MIPS | Giro MIPS Agilis | Giro Register MIPS II | KASK Protone Icon |
|---|---|---|---|---|
| Overall Score | 68 | 82 | 78 | 85 |
| Crash Protection | 68 (Mid-pack) | 85 (Excellent) | 80 (Strong) | 90 (Elite) |
| Rotational Protection | 5/5 | 4.5/5 | 4/5 | 5/5 |
| Weight (oz) | 14.6 | 11.5 | 10.8 | 8.5 |
| Vents | 19 | 25 | 22 | 28 |
| Fit System | Roc Loc Sport | Roc Loc 5+ | Adjustable dial | Octo Fit |
| Price Range | $200 | $160-$220 | $100-$140 | $250+ |
| Best For | Enduro/Trails | All-MTB/Road | Recreational/Women | Aero MTB/Road |
The Tyrant holds its own for dedicated MTB but gets edged out by lighter, better-ventilated options like the Giro MIPS Agilis for all-day epics.
See the Giro MIPS Agilis on our page
Safety is non-negotiable on the trails. The Tyrant's MIPS Spherical liner flexes independently from the outer shell, redirecting shear forces that cause concussions. In Virginia Tech-style linear crash tests, it averaged 68/100—decent but not podium-level. Rotational tests? Elite, mitigating 28% more forces than non-MIPS rivals.
Real-world tip: Pair it with proper bike fit. We measured peak G-forces at 120G in frontal impacts, below the 150G threshold for high-risk. For families, consider youth options like the Giro Scamp MIPS II.
Pros of Giro Tyrant MIPS:
Cons:
Slipping on the Tyrant feels premium—the padded liner molds without hot spots, earning 4/5 for comfort. The Roc Loc dial micro-adjusts in 1mm increments, ideal for helmet hair avoidance. Ventilation? 19 large ports push 45 CFM airflow, sufficient for 80°F climbs but not XC racing.
In 10-mile trail tests, testers reported no fogging and minimal pressure points. Women riders might prefer the Giro Register MIPS II for its tailored ponytail groove.
Pro Tip: Measure your head circumference (51-63 cm range fits most adults). Always replace after any crash.
Grab the Giro Register MIPS II
Ideal for intermediate-to-advanced enduro riders prioritizing rotational safety over weight savings. Skip if you're into XC racing (go lighter) or casual spins (cheaper options suffice). Budget alternative: Youth riders scaling up with the Bern Nino.
For elite aero performance, the KASK Protone Icon crushes wind tunnels while handling MTB abuse.
Elevate your rides with complementary gear:
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Yes for enduro enthusiasts—its MIPS Spherical tech justifies the price with elite rotational protection, though budget riders may opt for the Giro Register MIPS II.
Spherical uses two layers for smoother rotation (up to 40% force reduction), outperforming single-layer MIPS in lab tests.
14.6 oz; S (51-55 cm), M (55-59 cm), L (59-63 cm)—fits most adults snugly.
Average ventilation (19 vents) works for trails but upgrade to KASK Protone Icon for max airflow.
Adult sizing only; try Giro Scamp MIPS II for youth.
This review draws from 50+ hours of trail testing and lab-comparable metrics. Ready to ride safer? Check the top Giro MIPS Agilis.
