The Marin Bear Valley 20 represents a meticulously engineered entry point into serious mountain biking for young riders. This model combines a lightweight aluminium frame with authentic MTB geometry, paired with a Series 1 aluminium fork that absorbs trail feedback without compromising control. The drivetrain features MicroSHIFT Acolyte's 1x8 wide-range transmission with a clutch-equipped rear derailleur, delivering smooth, reliable gear changes across varied terrain. Tektro hydraulic disc brakes with ergonomic, child-scaled levers provide confident stopping power in all conditions. Complementing the core components is Marin's comprehensive suite of proprietary kid-specific parts—from grips to pedals—each refined through extensive development. The result is a cohesive platform that prioritizes both performance and rider comfort, making it an exceptionally well-considered choice for young cyclists ready to progress beyond casual riding.
Sizing:
One Size 4'1" to 4'8"
Specifications:
Frame - Series 2 Lightweight Aluminium MTB, Low Standover, 20” Wheels, Replaceable Derailleur Hanger, Disc Brake
Fork - Series 2 Aluminium MTB, Disc Brake A
Rim - Marin, Double Wall Alloy
Hub, rear - Forged Aluminium Alloy, 28H
Hub, front - Forged Aluminium Alloy, 28H
Spoke, nipples - 14g Stainless Steel
Tyres - Kenda, Booster, 20x2.4", Wire Bead
Derailleur, Rear - MicroSHIFT Acolyte, 8-Speed, Super Short Cage, Clutch
Derailleur, Front - n/a
Shift Lever - MicroSHIFT Acolyte, Short-Reach, 8-Speed
Crankset - Forged Alloy, 30T, 115mm, Ring Guard
Bottom Bracket - Sealed Cartridge Bearings, Square Taper
Chain - KMC 8-Speed
Cassette - MicroSHIFT Acolyte, 8-Speed, 11-38T
Brake, Front - Tektro HD-J285 Kid's Specific Hydraulic Disc
Brake, Rear - Tektro HD-J285 Kid's Specific Hydraulic Disc
Brake Levers - Hydraulic Kid's Specific Short Reach Alloy Lever
Handlebar - Marin Riser, 50mm Rise, 580mm Width, 19mm OD Grip Section
Stem - Alloy, 45mm
Grips - Single Densitiy, Thin Diameter Grip
Headset - Threadless
Seatpost - Aluminium, 27.2mm, Integrated Saddle/Post
Saddle - Marin 24" Integrated Saddle/Post
Pedals - Kids Specific Nylon Pedal
Bear Valley 20 2026
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The Marin Bear Valley 20 represents a meticulously engineered entry point into serious mountain biking for young riders. This model combines a lightweight aluminium frame with authentic MTB geometry, paired with a Series 1 aluminium fork that absorbs trail feedback without compromising control. The drivetrain features MicroSHIFT Acolyte's 1x8 wide-range transmission with a clutch-equipped rear derailleur, delivering smooth, reliable gear changes across varied terrain. Tektro hydraulic disc brakes with ergonomic, child-scaled levers provide confident stopping power in all conditions. Complementing the core components is Marin's comprehensive suite of proprietary kid-specific parts—from grips to pedals—each refined through extensive development. The result is a cohesive platform that prioritizes both performance and rider comfort, making it an exceptionally well-considered choice for young cyclists ready to progress beyond casual riding.
Sizing:
One Size 4'1" to 4'8"
Specifications:
Frame - Series 2 Lightweight Aluminium MTB, Low Standover, 20” Wheels, Replaceable Derailleur Hanger, Disc Brake
Fork - Series 2 Aluminium MTB, Disc Brake A
Rim - Marin, Double Wall Alloy
Hub, rear - Forged Aluminium Alloy, 28H
Hub, front - Forged Aluminium Alloy, 28H
Spoke, nipples - 14g Stainless Steel
Tyres - Kenda, Booster, 20x2.4", Wire Bead
Derailleur, Rear - MicroSHIFT Acolyte, 8-Speed, Super Short Cage, Clutch
Derailleur, Front - n/a
Shift Lever - MicroSHIFT Acolyte, Short-Reach, 8-Speed
Crankset - Forged Alloy, 30T, 115mm, Ring Guard
Bottom Bracket - Sealed Cartridge Bearings, Square Taper
Chain - KMC 8-Speed
Cassette - MicroSHIFT Acolyte, 8-Speed, 11-38T
Brake, Front - Tektro HD-J285 Kid's Specific Hydraulic Disc
Brake, Rear - Tektro HD-J285 Kid's Specific Hydraulic Disc
Brake Levers - Hydraulic Kid's Specific Short Reach Alloy Lever
Handlebar - Marin Riser, 50mm Rise, 580mm Width, 19mm OD Grip Section
Stem - Alloy, 45mm
Grips - Single Densitiy, Thin Diameter Grip
Headset - Threadless
Seatpost - Aluminium, 27.2mm, Integrated Saddle/Post
Saddle - Marin 24" Integrated Saddle/Post
Pedals - Kids Specific Nylon Pedal