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San Quentin 20"

2021 Marin San Quentin 20 profile.

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  • Suspension: SR Suntour XCM 24 BOOST
  • Wheel Size : 20"
  • Frame: Aluminum
  • Size Range: One Size


The San Quentin 24 and 20 is for the kid looking to explore everything an offroad bike can do from singletrack to park rides to just cruising the neighborhood in style.


  • Frame

    Series 2 6061 Aluminum, 20” Wheels, Disc Specific, 135mm Dropouts

  • Front Suspension

    SR/Suntour XCM 24 Boost, 80mm Travel, 110mm Axle Spacing

  • Rims

    Marin, Double Wall Alloy, 25mm Internal

  • Hub, Rear

    Forged Aluminum, 32H, Disc Specific

  • Hub, Front

    Forged Aluminum, 32H, Disc Specific

  • Spoke, Nipples

    14g Stainless Steel

  • Tires

    Vee Tire Co. Crown Gem, 20x2.6”, Wire Bead

  • Derailleur, Rear

    Shimano Altus

  • Derailleur, Front


  • Shift Lever

    Shimano Altus SL-M315, 8-Speed

  • Crankset

    Forged Alloy, Narrow Wide 30T, 140mm

  • Bottom Bracket

    Sealed Cartridge Bearings, Square Taper

  • Chain

    KMC Z8

  • Cassette

    Shimano 8-speed, 11-32T

  • Brake, Front

    Tektro HD-J285 Kid's Specific Hydraulic Disc

  • Brake, Rear

    Tektro HD-J285 Kid's Specific Hydraulic Disc

  • Brake Levers

    Tektro Kid's Specific Short Reach Lever for Hydraulic Brake

  • Handlebar

    Marin Riser, 31.8 clamp, 30mm Rise, 590mm Width

  • Stem

    Marin Alloy, 35mm

  • Grips

    Marin MTB

  • Headset

    1-1/8" x 1-1/8" FSA TH No 10P

  • Seatpost

    Marin Alloy, 30.9mm

  • Saddle

    Marin Kids MTB

  • Pedals

    Kids Specific Nylon Pedal

Specifications, pricing, and availability are subject to change without notice.


San Quentin 20" geometry diagram
Stack 502.5
Reach 310
Headtube Angle 65°
Headtube Length 90
Seattube Angle 75°
Seattube Length 308
Toptube Effective 444.6
BB Height 259
BB Drop 10
Chainstay 340
Wheelbase 912.9
Standover Height 534
Fork Offset 40
Seatpost Diameter 30.9
Handlebar Width 590
Stem Length 35
Crank Length 152

All lengths in millimeters

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