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El Oso Nino is our smallest fat bike, made for kids who want to monster-truck over everything in their path. Four-inch wide tires sit atop 20-inch wheels, making for a unique style and ride. Low tire pressure allows the bike to grab every bit of traction available, with extra float for soft surfaces and sand. This little bear’s frame and fork are made from high-tensile steel, tough enough for prowling the neighborhood and the woods. It’s got a seven-speed Shimano grip shifter to charge up hills, and powerful disc brakes for control, allowing riders to go wherever the trail or their imagination takes them — maybe even to the moon! This model fits riders 44”-55” tall, aged approximately 4-9 years old.

  • FRAME20″ Hi-Ten Steel Junior Fat Bike, for Disc Brake Only
  • FORK20″ Hi-Ten Steel Junior Rigid, w/ Disc Tabs
  • HEADSETThreadless
  • CRANKS152mm Steel w/ 40T Single Ring
  • BOTTOM BRACKETSquare Taper – 5pc
  • REAR DERAILLEURShimano Tourney FT35, 7 Speed
  • SHIFTERShimano Tourney RS35 Grip Shift, 7 Speed
  • COGSETShimano Tourney TZ21 7 Speed Freewheel,14-28T
  • CHAINKMC 7 Speed
  • FRONT HUBSteel 32h Disc, 3/8″ Nutted, 135mm OLD
  • REAR HUBSteel 32h Disc, Freewheel, 3/8″ Nutted, 180mm OLD
  • SPOKES14g Steel
  • RIMS32h Jr Fatty Alloy
  • TIRESChaoyang 20×4.0″
  • BRAKE LEVERSAlloy Lever
  • PEDALS9/16″ Resin
  • HANDLEBARAlloy, 560mm Wide, 22.2mm Bar Bore
  • GRIPSDB Kraton
  • STEMPromax 90mm
  • SEATPadded Jr. Diamondback
  • SEATPOSTSteel 27.2mm
  • EXTRASTool Kit
  • BRAKESApex Mechanical Disc, w/ 160mm Front /160mm Rear Rotor
  • PRODUCT ID4739

* Specifications are subject to change without notice

FRAME SIZE 20″ 44″-55″
Rider Height
Bike Stand Over Height 576.0 mm
Bike Seat Tube Length 272.0 mm
Bike Top Tube Length 508.0 mm
Bike Head Tube Length 115.0 mm
Bike Head Angle 71.0 °
Bike Seat Angle 70.0 °
Bike Wheel Base 927.0 mm
Bike Chain Stay Length 380.0 mm
Bike Fork Offset 45.0 mm
Bike Bb Height 240.0 mm
Bike Bb Drop 11.0 mm
Bike Stem Length 90.0 mm
Bike Handlebar Width 560.0 mm
Bike Crank Length 152.0 mm
Bike Seat Post Length 260.0 mm
Bike Stack 445.0 mm
Bike Reach 345.0 mm
Bike Fork Length 358.0 mm


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