Smith Mainline MIPS
Smith Mainline MIPS
Smith Mainline MIPS
Smith Mainline MIPS
Smith Mainline MIPS
Smith Mainline MIPS
Smith Mainline MIPS
Smith Mainline MIPS
Smith Mainline MIPS
Smith Mainline MIPS
Smith Mainline MIPS
Smith Mainline MIPS
Smith Mainline MIPS
Smith Mainline MIPS
Smith Mainline MIPS
Smith Mainline MIPS
Smith Mainline MIPS
Smith Mainline MIPS
Smith Mainline MIPS
Smith Mainline MIPS
Smith Mainline MIPS
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Mainline MIPS

Regular price$350.00
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Mainline Mips® Helmet

Made for going big, going fast, or both, the Mainline is a downhill-certified enduro helmet. Safety innovations like KOROYD™ and Mips® provide energy-absorbing impact protection so you have the confidence to get aggressive on the trail. Whether you're smashing rocky gaps or suffering through the last stage of your local enduro race, you need a breathable, lightweight helmet that pairs well with goggles and fits like a glove. The Mainline integrates with your bike goggles for efficient venting and fog-free vision, and multiple pad sets including liners and neck-rolls let you customize the fit.

Complete KOROYD™ Coverage
Complete — not zonal — KOROYD™ coverage delivers lightweight, energy-absorbing, ventilated impact protection across the whole shell, which is what downhill and big-gap riding demands.
Mips® Brain Protection System
Mips® reduces rotational forces caused by angled impacts to the head, adding a layer of protection against the most dangerous type of crash impact in mountain biking.
Downhill & E-Bike Certified
Certified to ASTM F1952 Downhill and NTA8776 E-Bike standards in addition to the baseline CPSC bicycle and CE EN 1078 requirements — built for high-speed impact and powered descents.
Goggle Integration & AirEvac™
Designed for ultimate integration with performance goggles, with an AirEvac™ ventilation system that channels air through the shell to keep lenses fog-free through long, hard stages.
Customizable Fit System
Three washable cheek pad kits, two crown liners, and two neck rolls let you fine-tune the fit to your head shape and riding style — swap configurations rather than buying a different helmet.
Anti-Bacterial Performance Lining
A hybrid X-STATIC® / Ionic+® anti-bacterial performance lining resists odor through multi-day race weekends and long seasons without the chemical smell of treated foams.
21 Fixed Vents
Twenty-one fixed vents promote consistent airflow on hot days, exposed climbs, and the long descents where you're working hardest.
Adjustable Visor
An adjustable visor shades the eyes from sun and debris and can be repositioned to clear your goggle strap as your setup changes through the day.
D-Ring Chin Strap Fastener
A D-ring chin strap fastener delivers a secure, adjustable fit that stays put through aggressive riding, drops, and repeated impacts.

General

Type
Downhill-certified enduro bike helmet
Activity
Enduro racing, downhill mountain biking, big-freeride, pump track, e-bike riding
Available Sizes
S, M, L
Warranty
3 years

Protection

Construction
Complete KOROYD™ coverage, lightweight and ventilated
Rotational Protection
Mips® Brain Protection System
Standards
U.S. CPSC Safety Standard for Bicycle Helmets (Persons Age 5 and Older), CE EN 1078, NTA8776 E-Bike, ASTM F1952 Downhill

Fit & Integration

Goggle Integration
Designed for ultimate integration with performance goggles
Ventilation
AirEvac™ system integrated with goggles for fog-free lenses, 21 fixed vents
Fit Customization
Three washable cheek pad kits, two crown liners, two neck rolls
Chin Strap
D-ring fastener for a snug fit
Lining
Hybrid X-STATIC® / Ionic+® anti-bacterial performance lining
Visor
Adjustable

Measurements

Weight (Size M, Mips®)
27 oz / 770 g

What's Included

Pad Kit
Washable pad kit
Bag
Bike helmet bag
Pad Cleaning
Remove the cheek pads, liners, and neck rolls after each ride and wash them by hand in lukewarm water with mild soap. The anti-bacterial lining resists odor, but trapped sweat and salt still degrade foam over time if left in place.
Shell Cleaning
Wipe the shell with a damp cloth and mild soap after riding. Never use a dishwasher, bleach, solvents, or harsh chemical cleaners — these degrade KOROYD™ and can compromise impact protection.
Drying
Air dry all components at room temperature away from direct heat and sunlight. Do not use a hair dryer, radiator, or tumble dryer. Heat can warp the shell and damage the comfort liner and internal padding.
Storage
Store in the included bike helmet bag, in a cool, dry place out of direct sunlight. Avoid leaving the helmet loose in a vehicle or on a dash — heat and UV degrade the shell and degrade the fit of the pad system.
After a Crash
Replace the helmet after any impact, even if the damage is not visible. KOROYD™ and the internal padding absorb energy by deforming, and that protection is permanently consumed by the hit.
Fit Check
Confirm the helmet sits level and secure on your head before every ride, and that the chin strap is fastened through the D-ring. A loose or tilted helmet compromises both fit and protection — recheck after swapping pad kits or liners.

Shipping Policy

Components:

All component items (wheels, drivetrains, suspension, brakes, etc.) ship within 4-7 business days of purchase.

Bicycles:

Complete bikes typically ship within 2–3 weeks due to build, tuning, and inspection times. You will receive tracking information as soon as your order is ready to ship.

 Gear & Apparel:

Outdoor Gear and apparel orders (helmets, jerseys, gloves, etc.) ship within 5-21 business days. Please reach out to us with the most up to date deliveries times as they vary per Manufacturer. 

Returns & Exchanges:

If you received the wrong size or wish to exchange an item, it must be returned in original condition—unused, uninstalled, and with all packaging intact.

For full details, please see our Refund Policy before initiating a return.

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Prepared with intention.

Every product is carefully inspected and handled by our team before it ships. From fit and function to final details, we make sure each piece is ready for the outdoors ahead—so you can focus on the experience, not the gear.

Passion drives us

At SpokeX Bike Co., bikes aren't just our business — they’re our way of life. As a rider-owned and operated shop, every decision we make comes from firsthand experience on the trail, at the race, and on the open road. We know what it’s like to chase a new line, push through the pain cave, and celebrate the ride — because we live it every day.

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