Trek Ballista Mips Road Bike Helmet

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About this product

The details.

Less wind. More win.

When speed is your top priority and every watt counts, reach for the helmet that'll cut through the wind to save you seconds. Ballista is Trek's fastest, most aerodynamically-advanced helmet.

Ballista is light, cool, comfortable, and engineered with a fully-integrated Mips Air safety system that's designed to help keep you safer.

Product details

Trek's fastest, most aerodynamic helmet saves big watts and shaves crucial seconds
An excellent ventilation system makes this aero helmet surprisingly cool and comfortable
The Mips Air system is light, cool, and designed to help reduce rotational forces
The single-lace BOA® fit system is fully adjustable to provide a custom, 360° fit
Rubberized sunglasses docking port provides secure and easy-to-use storage
Crash Replacement Guarantee provides a free helmet replacement if involved in a crash within the first year of ownership
30-Day Unconditional Guarantee allows you to return your helmet if you're unsatisfied for any reason
Complies with U.S. CPSC safety standards for bicycle helmets for persons age 5 and over

What makes it special

The little details. The big difference.

01
Our fastest helmet ever
Ballista is the fastest helmet in Trek's lineup. Its aerodynanic efficiency saves riders 10.1 watts of power and more than one bike length during a final sprint versus Velocis in a standard 1-hour test.
02
Unexpectedly light
Ballista is light. At 275 grams, its minimalistic, low-profile design makes for a faster helmet that's lighter than ever before.
03
Cool is fast
Insight from computational fluid dynamic analysis helped optimize vent and channel design for more efficient airflow, creating a cool helmet.
04
Mips Air safety system
Less weight, seamless integration, improved sweat management, and rotational force management technology from Mips provide better performance and a better experience on the bike.
05
A better fit
For that Goldilocks fit, Ballista features a single-lace, 360° BOA® fit system with two lace height positions and three yoke positions — offering complete customization.
06
Secure storage
Ballista’s rubberized side vents make it easy to stow away your sunglasses when you’re not wearing them.

The details

Good to know-

Specs6

Fit system: BOA®
Pad material: Moisture wicking pads
Buckle type: Lightweight buckle
Includes: Crash Replacement Guarantee, NoSweat pad and travel bag

Size	S	M	L
Circumference	51-57cm	54-60cm	58-63cm
Weight	250.0g	275.0g	295.0g

Good to know4

Crash Replacement Guarantee 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.
30-Day Unconditional Guarantee 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.
Helmet Fit and Sizing 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.
Our helmets build the future $1 from the sale of every Bontrager helmet in North America supports PeopleForBikes, which provides guidance, a rating system, a leadership conference, and professional support for transforming cities throughout the United States in the ongoing effort of becoming a bicycle friendly nation.

What reviewers are saying.

“Best aero helmet overall”
...a helmet I absolutely loved as soon as I took it out of the box...incredibly light...excellent glasses retention…
cyclingnews.com · Read the review
“An excellent aero road helmet”
As far as aero helmets go, it ticks all the right boxes, with an optimised shape, a comfortable fit, a competitive weight and excellent safety credentials.
bikeradar.com · Read the review
“A winning combination”
This lid will help to elevate your racing and riding, offering an impressively well vented aerodynamic option that won’t feel claustrophobic...
cyclingweekly.com · Read the review
“As cool as a standard road helmet”
...its latest design makes it feel more like one of the lightest and most comfortable standard-shaped road helmets we’ve ever tested.
intheknowcycling.com · Read the review