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Marin Donky Jr 20

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The Donky Jr. 20" is built around a lightweight aluminum alloy frame and stout steel fork, with the addition of a dependable and smooth-shifting Shimano 6-speed drivetrain—perfect for a growing rider who is able to get out on longer rides.

bike frame with labeled dimensions
Bike Sizes:
One Size
A. Reach 295mm
B. Stack 419mm
C. Standover 525mm
D. Effective Top Tube 431mm
E. Head Tube Angle 69°
F. Head Tube Length 95mm
G. Seat Tube Angle 72°
H. Seat Tube Length 280mm
I. Bottom Bracket Height 253mm
K. Fork Rake/Offset 25mm
M. Wheelbase 842mm
O. Chainstay Length 359mm
Handlebar Width 580mm
Stem Length 60mm
Crank Length 140mm


Frame Aluminum, 20" Kids
Fork Steel Straight Blade, 1 1/8" Threadless Steerer Tube
Rims Marin Double Wall Aluminum w/Machined Sidewalls
Hubs Steel, 32H
Spokes Black Stainless Steel 14G Spokes, Brass Nipples
Tires Marin/Vee Tire Speedster, 20 x 2.0"
Bottom Bracket Sealed Cartridge Bearing, Square Taper
Crankset Alloy 3-Piece, 140mm; 36t chainring
Shifters Shimano Revo Twist Shift, 6-Speed
Rear Derailleur Shimano Tourney 6-Speed
Cassette/Freewheel Shimano 6-speed, 14-28t
Chain KMC HV500 6-speed
Brakes Tektro Linear Pull
Brake Levers Tektro Kids Specific Short Reach Alloy
Handlebars Marin Steel MTB
Tape/Grips Kids Specific
Stem Marin Alloy
Headset FSA No. 8B, Threadless, 1 1/8"
Seatpost 27.2mm Steel, Integrated w/ Saddle
Saddle Marin Kids w/ Integrated Seat Post
Pedals Kids Specific Nylon
Accessories & Extras Rear-Mount Steel Kickstand, Rear Derailleur Guard

* Subject to change without notice.