Marin Kids’ Bikes

Built for Fun, Ready for Adventure

Welcome to your local destination for Marin Kids and Youth Bicycles at Blue Heron Bikes. For decades, Marin has been legendary for building rugged, high-performance mountain bikes right here in Northern California. They bring that exact same passion, durability, and trail-ready engineering to their youth lineup.

Marin doesn't just make smaller frames; they design specific youth geometries featuring lightweight frames, low standover heights, and reliable, kid-friendly components. Whether your child is just starting out on neighborhood sidewalks, commuting to school, or ready to shred local dirt trails and pump tracks, our curated selection of Marin youth bikes delivers maximum confidence and control.

Explore our in-stock lineup below to find the perfect ride for your growing cyclist.

Donkey Jr. Series

Lightweight & Agile Neighborhood Explorers (Ages 4–8)

The Donkey Jr. is the ideal all-around bike for young riders stepping up their cycling skills. Built with lightweight aluminum frames and reliable V-brakes, these bikes feature components perfectly scaled down for smaller hands and feet. They offer a stable, predictable ride that makes learning transitions easy and neighborhood exploring fun.

**Donkey Jr. 16:** Perfect for transitioning from balance bikes or training wheels into confident pedaling (Ages 4–6).

**Donkey Jr. 20:** Features multi-speed drivetrains with easy-shifting controls to help kids conquer local hills (Ages 5–8).

**Donkey Jr. 24:** Brings the same lightweight agile frame design to a larger platform, offering smooth-shifting gears and dependable braking for older kids mastering longer neighborhood rides and school commutes (Ages 7–12).

Coast Trail Series

The Ultimate Path & Trail Versatility (Ages 4–12)

Engineered to handle a seamless mix of paved bike paths and light off-road terrain, the Coast Trail series is built for rugged durability and everyday utility. Designed with stable handling and sturdy tires, it’s the perfect do-it-all machine for the family ride, weekend greenway loops, or the daily school commute.

**Coast Trail 16:** A tough, single-speed platform engineered to build confidence on mixed surfaces (Ages 4–6).

**Coast Trail 20:** Introduces gear shifting on a versatile, mid-size frame built for neighborhood boundaries and beyond (Ages 5–8).

**Coast Trail 24:** A fully capable youth bike featuring wider gear ranges to keep pace with longer family adventures (Ages 7–12).

Bear Valley 24

Real Mountain Bike Performance for Growing Shredders (Ages 7–12)

Named after classic California trail country, the Bear Valley 24 is a true, scaled-down mountain bike built for aspiring trail riders. Equipped with a suspension fork to smooth out rocks and roots, powerful disc brakes for reliable stopping in all weather, and trail-ready tires, this bike gives older youth the performance tools they need to tackle singletrack confidently alongside adults.

Alcatraz 24

Premium Dirt Jump & Pump Track Machine (Ages 7–12)

Designed in collaboration with world-class freeride athletes, the Alcatraz 24 is a ultra-tough, dedicated dirt jump and pump track weapon optimized for younger, smaller-statured rippers. Featuring a hyper-sturdy aluminum frame, a short wheelbase for easy flickability, premium suspension, and a bulletproof single-speed drivetrain, this bike is built for progressive riders looking to perfect their style at the local bike park.