Marin Bear Valley 20 Bike 2025Ready to shred. The Marin Bear Valley 20 is one of the most focused kids' trail bikes in the Marin lineup. Built around a lightweight aluminum frame with proper MTB geometry, a Series 2 aluminum fork, Micro SHIFT Acolyte 1x8 drivetrain with a clutch rear derailleur, and Tektro hydraulic disc brakes with kid-specific short-reach levers, the Bear Valley 20 is built to get young riders onto real trails with real bike performance - not watered-down kids' gear. Marin-branded kid-specific components throughout keep weight reasonable and proportions dialed for smaller riders. Features Lightweight Series 2 aluminum frame with low standover, proper MTB geometry, replaceable derailleur hanger, and 20" wheels - a real trail bike designed specifically for kids Micro SHIFT Acolyte 1x8 drivetrain with clutch rear derailleur - wide-range 11-38T cassette and a clutch mechanism to keep the chain on through rough terrain Tektro HD-J285 kids' hydraulic disc brakes with short-reach kid-specific levers front and rear - powerful, reliable stopping scaled for smaller hands Kid-specific components throughout - 580mm handlebar, 50mm rise, 115mm cranks with ring guard, thin-diameter grips, and integrated saddle/seatpost designed proportionally for young riders SPECIFICATIONSFrame Series 2 Lightweight Aluminum MTB, Low Standover, 20" Wheels, Replaceable Derailleur Hanger, Disc Brake Fork Series 2 Aluminum MTB, Disc Brake Headset Threadless Front Derailleur N/ARear Derailleur Micro SHIFT Acolyte, 8-Speed, Super Short Cage, Clutch Shifters Micro SHIFT Acolyte, Short-Reach, 8-Speed Crankset Forged Alloy, 30T, 115mm, Ring Guard Bottom Bracket Sealed Cartridge Bearings, Square Taper Chain KMC, 8-Speed Cassette Micro SHIFT Acolyte, 11-38T, 8-Speed Brakes Tektro HD-J285 Kids' Specific Hydraulic Disc (Front and Rear)Wheelset Aluminum Double Wall Rims, 28HFront Hub Forged Aluminum Alloy, 28HRear Hub Forged Aluminum Alloy, 28HTires Kenda Booster, 24x2. 4", Wire Bead Handlebar Marin Riser, 50mm Rise, 580mm Width, 19mm OD Grip Section Stem Alloy, 45mm Grips Single Density, Thin Diameter Seatpost Aluminum, 27. 2mm, Integrated Saddle/Post Saddle Marin 24" Integrated Saddle/Post Pedals Kids' Specific Nylon Platform Intended Use Youth Trail Note: Components are subject to change without notice. METRICINCHMarin Bear Valley 20Size One A: Seat Tube Length280B: Effective Top Tube425C: Stack401D: Reach317F: BB Drop30G: Head Tube Length100H: Head Tube Angle67 degI: Seat Tube Angle75 degJ: Standover Height518K: Chainstay Length375L: Wheelbase892Stem Length45 mm Handlebar Width580 mm Crank Arm Length115 mm Marin Bear Valley 20Size One A: Seat Tube Length11. 0B: Effective Top Tube16. 7C: Stack15. 8D: Reach12. 5F: BB Drop1. 2G: Head Tube Length3. 9H: Head Tube Angle67 degI: Seat Tube Angle75 degJ: Standover Height20. 4K: Chainstay Length14. 8L: Wheelbase35. 1Stem Length45 mm Handlebar Width580 mm Crank Arm Length115 mm | Marin Bikes | Bear Valley 20" Bike Black Green Os | Nylon