We’ll make this a great experience
It’s our mission to provide you with world-class hospitality every time you visit us online or in-store. We’ll always take care of you. It’s the Trek way.
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.
"Rich with high-end performance and features"
"This feature-packed helmet has sophisticated styling, a comfortable fit, and excellent ventilation"
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"There’s really no reason not to recommend the Circuit Mips as your next helmet"
"Fairly large vents at the front do a great job at channeling air through the helmet and out the exhaust ports in back."
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"Feature packed helmet"
"The new Bontrager Circuit Mips road helmet provides great performance and features all for a reasonable price"
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How to clean your bike helmet
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!
Read moreProduct features
Multi-directional Impact Protection System
Created through years of research, Mips is designed to accentuate the brain’s own ability to protect itself and can provide better protection from angled impacts.
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.
Learn moreOur 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.
Learn moreCrash 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.
Learn moreHelmet 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.
Learn more| Size | S | M | L |
|---|---|---|---|
| Circumference | 51-57cm | 54-60cm | 58-63cm |
| Fit system | BOA® | BOA® | BOA® |
| Pad material | Moisture wicking pads | Moisture wicking pads | Moisture wicking pads |
| Buckle type | Lightweight buckle | Lightweight buckle | Lightweight buckle |
| Includes | Crash Replacement Guarantee, Blendr front and rear mount | Crash Replacement Guarantee, Blendr front and rear mount | Crash Replacement Guarantee, Blendr front and rear mount |
| Weight | 277g | 300g | 330g |