Skip to main content

Trek Ballista MIPS Bike Helmet

Trek Ballista MIPS Bike Helmet
  • Color: Black
  • Color: Black
  • Color: Black
  • Color: Black
  • Color: Black
  • Color: Black
  • Color: Purple Flip
Color: Black
Size: Select size
Please select options Unavailable


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.

Trek's 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.

Unexpectedly Light

Ballista is light. At 275 grams, its minimalistic, low-profile design makes for a faster helmet that's lighter than ever before.

Cool Is Fast

Insight from computational fluid dynamic analysis helped optimize vent and channel design for more efficient airflow, creating a cool helmet.

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.

Secure Storage

Ballista’s rubberized side vents make it easy to stow away your sunglasses when you’re not wearing them.

A Clear View

Ballista features a beveled edge above the brow that opens up your field of view and lets you easily see the road ahead — even when tucked in the dropss.


51 - 57 cm

20" - 22"


54 - 60 cm

21" - 24"


58 - 63 cm

23" - 25"

Trek's 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.

Ballista has received a 5-STAR safety rating from Virginia Tech's third-party testing facility, an unbiased, industry-accepted assessment of the level of protection a helmet provides to a cyclist.

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


Weight (g) Small (250g) | Medium (275g) | Large (295g)
Retention System BOA®
Protection MIPS (Multi-Directional Impact Protection System)
Certification U.S. CPSC safety standards | Virginia Tech 5-STAR Rating
Type Road (Aero)

* Subject to change without notice.


Trek Ballista Mips Road Bike Helmet // Product Walkthrough

Part Numbers

Option UPC Store SKU
Black / Medium 768682601600 HEL428104073
Black / Large 768682601341 HEL427339013