Trek Rally WaveCel Mountain Bike Helmet

The Rally WaveCel Mountain Bike Helmet is 5-star rated by Virginia Tech and features updated, lighter and cooler WaveCel safety tech. You'll love how easy it is to dial in the perfect fit with a BOA® Fit System, lay-flat camlock straps, and a Fidlock magnetic buckle. Plus, the goggle friendly three-position visor has built-in sunglass storage and the removable Blendr mount makes it easy to mount a Trek light or GoPro.

Plus, the deeper rear coverage offers additional protection, and two front-facing vents are strategically placed to offer more airflow to make Rally WaveCel feel cooler and look the part as well.

Product details

5-star safety rating from Virginia Tech with lighter and cooler WaveCel technology
Deeper rear coverage provides added protection
Front vents and channel system with 10% larger cells for more airflow and efficient cooling
Excellent fit and comfort via BOA® fit system, lay-flat camlock strap, and Fidlock strap buckle
Goggle compatible three-position visor with built-in sunglass storage
Removable Blendr magnetic mount system easily integrates a GoPro camera or Trek lights
Crash Replacement Guarantee provides a free replacement in the event of a crash within the first year of ownership
Complies with U.S. CPSC safety standards for bicycle helmets for persons age 5 and over

Comfort and style for the trail

Get ready to rip with this top-of-the-line half shell trail helmet with deeper coverage, a three-position visor, Blendr mounts, integrated sunglass storage, and more. Trek Rally WaveCel also features updated WaveCel helmet technology with 10% larger cells for more airflow and 15g of weight savings.

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"...a comfortable, feature-packed trail lid with exceptional safety ratings."

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"...the new Rally and Quantum helmets includes deeper rear coverage, protecting the back of the head. Plus, Trek’s Crash Replacement Guarantee provides a free replacement within the first year of ownership if you’re involved in a crash."

Get all your favorite apparel from over 80 of the world's best cycling brands delivered right to your doorstep or local Trek retailer when you shop our curated online collection. If you're not 100% satisfied, you can return your purchase within 30 days for a full refund.

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Want to do more than wear a helmet? Check out this guide to riding safer.

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To ensure your bike helmet looks and performs its best, it's important to properly clean and care for it. Check out our simple guide to learn how to maintain your bike helmet. It's easy to do and takes little time!

WaveCel is a revolutionary helmet technology designed to be more effective than traditional foam helmets in protecting against certain cycling-related accidents. Its collapsible cellular structure lines the inside of your helmet and is designed to work like a crumple zone to absorb the force of an impact before it reaches your head.

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We'll provide you with a free replacement helmet if it's involved in a crash within the first year of ownership. Just contact us or your local retailer with the crashed helmet, original sales receipt, details of the incident, and a return address for your replacement.

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All WaveCel helmets received the highest rating from Virginia Tech's third-party testing facility. This unbiased assessment proved Trek's WaveCel helmets to be among the highest level of protection available to cyclists with a 5-STAR rating.

New-and-improved WaveCel technology features 10% larger cells that allow for more airflow while saving weight.

An extended back-of-helmet shell offers additional protection around the rear of the head.

Grippy sunglass storage channels make it easy to secure your sunnies mid-ride.

Get the look and sun protection you want with an adjustable visor that easily sets into three positions.

A removable Blendr mount makes it easy to mount a light or camera when you want it, or opt for a cleaner look when you don't.

Easily secure and adjust the helmet fit with just one hand.

A Fidlock magnetic buckle fastens effortlessly for a quick, secure fit that can easily be fastened or unhooked with a single hand.

Not sure which helmet is right for you? Check out our helmet buyer's guide to learn everything you need to know about bike helmets.

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With our Crash Replacement Guarantee, we will provide you with a free replacement helmet if it is involved in a crash within the first year of ownership. Simply contact us or your local retailer with the crashed helmet, original sales receipt, details of the incident, and a return address for your replacement.

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If for any reason you're not satisfied with a Bontrager or Trek aftermarket purchase, return the item, along with the original sales receipt to the original place of purchase within 30 days for an exchange or refund. Think of it as a 30-day test ride.

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For your helmet to do its job, it's important that it's sized properly and fits well. Reference our sizing guide at the link below to find your ideal size and see how Bontrager helmets are intended to fit.

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Size	S	M	L	XL
Circumference	52-56cm	55-59cm	58-62cm	61-64cm
Fit system	BOA®	BOA®	BOA®	BOA®
Pad material	Moisture wicking pads	Moisture wicking pads	Moisture wicking pads	Moisture wicking pads
Buckle type	Fidlock buckle	Fidlock buckle	Fidlock buckle	Fidlock buckle
Includes	Crash Replacement Guarantee	Crash Replacement Guarantee	Crash Replacement Guarantee	Crash Replacement Guarantee
Weight	365g	380g	410g	425g

We reserve the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colors, materials, and pricing. Due to supply chain issues, compatible parts may be substituted at any time without notice. Prices shown are manufacturer's suggested retail prices.

Weights are based off pre-production products at time of publication. Weights may vary in final production.

size-table
Size	Circumference
S	52 - 56 cm 20" - 22"
M	55 - 59 cm 22" - 23"
L	58 - 62 cm 23" - 24"
XL	61 - 64 cm 24" - 25"