San Quentin 20 Jr
OverviewAbout the Marin San Quentin 20 Jr
The Marin San Quentin 20 Jr is a kids bike, built on an aluminium frame, listed at $1,299.99 at BikesOnline. A bike sized and geared for younger riders.
How it comparesThe San Quentin 20 Jr against similarly priced bikes
- At $1,299.99 it sits in the upper part of the range: 89% of the 55 kids bikes we list cost less.
- Gears at the back: 8-speed, fewer than the middle of similarly priced kids bikes (9-speed).
- Stock tyre width: 66 mm, wider than the middle of similarly priced kids bikes (57 mm).
Closest alternatives on price
same price · 9-speed vs 8-speed · 60 mm fork vs 80 mm · 57 mm tyres vs 66 mm
$199 more
$300 more
$300 more · 11-speed vs 8-speed · 60 mm tyres vs 66 mm
Compare the San Quentin 20 Jr with the two closest side by side
Compared with the 8 similar kids bikes on BikeFinder priced $900 to $1,750, using each bike's published specs and the price shown on its page.
SpecificationsWhat we know
- Brand
- Marin
- Category
- Kids
- Frame
- Aluminium
- Wheel size
- 20-inch
- Drivetrain
- microSHIFT Acolyte 1x8
- Brakes
- Disc
- Frame sizes
- One size
- Price
- $1,299.99 at BikesOnline, was $1,599.99. In stock, checked 3 Nov 2026.
Specs and pricing are listed in AUD and sourced from Australian retail listings. Confirm the current details and availability with the seller before purchase.
GeometrySize One size
- Stack
- 499 mm
- Reach
- 310 mm
- Stack/reach
- 1.61
- Head angle
- 65 deg
- Seat angle
- 75 deg
- Wheelbase
- 922 mm
- Chainstay
- 340 mm
- BB drop
- 10 mm
- Standover
- 540 mm
- Fork rake
- 40 mm
GearingRatios
Ratios are derived from the chainrings and cassette. They describe the gearing, not any rider's ability.
Drivetrain & buildFull specification
- Groupset
- microSHIFT Acolyte
- Shifting
- Mechanical
- Drive
- 1x
- Speeds
- 8
- Crank
- Forged Alloy, Narrow Wide, 140mm Length
- Chainrings
- 30
- Cassette
- MicroSHIFT Acolyte, 8-Speed, 11-38T
- Rear derailleur
- MicroSHIFT Acolyte, 8-Speed, Super Short Cage, Clutch
- Brakes
- Tektro HD-J285, Kid's Specific Hydraulic Disc
- Wheelset
- Marin Double Wall Alloy, 25mm Internal Width
- Rim internal width
- 25 mm
- Stock tyre
- 20x2.6
- Fork material
- Manitou Junit Sport Air BOOST suspension fork
- Seatpost
- Marin Alloy, 30.9mm
- Cockpit
- Marin Alloy, 35mm / Marin Riser Bar, 31.8mm Clamp, 30mm Rise, 590mm Width
- Saddle
- Marin Kids MTB
SuspensionMTB detail
- Front travel
- 80 mm
- Fork
- Manitou Junit Sport Air BOOST
- Suspension
- hardtail
Bike DNAWhat the numbers say
- Position
- Stack-to-reach 1.61 gives an upright, comfort-oriented riding position.
- Steering
- A 65 deg head angle points to stable, relaxed steering.
- Climbing
- Lowest ratio 0.79 is a very low climbing gear for steep or loaded climbs.
Derived from the published geometry and gearing above. It describes the numbers, not a ride test.
BikeFinder Data Profile: geometry and specification researched from published sources (BikesOnline product page (specification list and geometry table)), verified 2026-11-03. This is a specification analysis, not a physical ride review.
Where to buyStockist
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