Marin San Quentin 24 2026 - Junior Bike
The Marin San Quentin 24 takes the DNA of Marin’s hardcore hardtails and scales it down for younger riders. Designed with input from freeride legend Matt Jones, this bike combines a robust Series 2 aluminium frame, 100mm travel RockShox Judy fork, and a reliable microSHIFT 9-speed drivetrain, making it perfect for adventurous kids ready to hit the trails.
Key Features:
- Frame: Series 2 6061 Aluminium, 24” wheels, disc specific
- Front Fork: RockShox Judy Silver TK, 100mm travel
- Drivetrain: microSHIFT Advent, 9-speed
- Brakes: Shimano BR-MT201 hydraulic disc brakes
- Wheels: Marin double wall alloy, 24”
- Tyres: Vee Tire Crown Gem, 24”x2.6”
- Other Standout Feature: Kid’s specific hydraulic disc brakes
- Finance: Available with 0% APR finance
The Marin San Quentin 24 is crafted to provide young riders with a genuine mountain biking experience. Its sturdy Series 2 6061 aluminium frame ensures durability while keeping the weight manageable for kids. The RockShox Judy Silver TK fork offers 100mm of travel, giving young riders the confidence to tackle rough terrains and absorb shocks from jumps and drops.
Equipped with a microSHIFT Advent 9-speed drivetrain, the San Quentin 24 offers a wide range of gears, making it easy for kids to handle climbs and descents. The Shimano BR-MT201 hydraulic disc brakes provide powerful and reliable stopping power, ensuring safety on every ride. The Marin double wall alloy rims, paired with Vee Tire Crown Gem tyres, offer excellent grip and stability on various surfaces.
Designed with the same attention to detail as Marin's adult bikes, the San Quentin 24 ensures that young riders don't miss out on performance or style. The kid’s specific hydraulic disc brakes are scaled to fit smaller hands, providing better control and comfort.
Occasionally, without notice, manufacturers change product design and/or specifications.
| Frame | Series 2 661 Aluminum, 24” Wheels, Disc Specific, 135mm Dropouts |
| Fork | RockShox Judy Silver TK, 100mm Travel, Solo Air, 110x15mm Maxle Stealth |
| Headset | FSA No. 57E |
| Stem | FSA No. 57E |
| Bars | Marin Riser, 31.8 clamp, 3mm Rise, 59mm Width |
| Front Brake | Shimano BR-MT201 Hydraulic, 160mm Rotor |
| Rear Brake | Shimano BR-MT201 Hydraulic, 160mm Rotor |
| Brake Lever | Shimano Hydraulic |
| Rear Mech | MicroSHIFT Advent 9-Speed |
| Shifters | MicroSHIFT Advent 9-Speed |
| Speed | 9 |
| Rims | Marin, Double Wall Alloy, 27mm Internal |
| Front Hub | Forged Aluminum, 32H, Disc Specific |
| Rear Hub | Forged Aluminum, 32H, Disc Specific |
| Spokes | 14G Stainless Steel |
| Front Tyre | Vee Tire Crown Gem, 24”x2.6”, Wire Bead |
| Rear Tyre | Vee Tire Crown Gem, 24”x2.6”, Wire Bead |
| Seat Post | Marin Alloy, 3.9mm |
| Saddle | Marin Kids MTB |
| Chainset | Forged Alloy, Narrow Wide 3T, 152mm |
| Bottom Bracket | Sealed Cartridge Bearings, Square Taper |
| Chain | KMC X9 |
| Cassette | MicroSHIFT 9-Speed, 11-46T |
| Pedals | Resin Platform |
San Quentin Sizing
See the table below to find the right size Marin San Quentin.
|
Height |
Size |
||||||
|
4’8” / 143cm |
XXS |
|
|
|
|
|
|
|
4’9” / 145cm |
XXS |
|
|
|
|
|
|
|
4’10” / 148cm |
|
XS |
|
|
|
|
|
|
4’11” / 150cm |
|
XS |
|
|
|
|
|
|
5’0” / 152cm |
|
XS |
|
|
|
|
|
|
5’1” / 155cm |
|
XS |
S |
|
|
|
|
|
5’2” / 158cm |
|
|
S |
|
|
|
|
|
5’3” / 160cm |
|
|
S |
|
|
|
|
|
5’4” / 163cm |
|
|
S |
|
|
|
|
|
5’5” / 165cm |
|
|
S |
M |
|
|
|
|
5’6” / 168cm |
|
|
|
M |
|
|
|
|
5’7” / 170cm |
|
|
|
M |
|
|
|
|
5’8” / 173cm |
|
|
|
M |
|
|
|
|
5’9” / 175cm |
|
|
|
M |
L |
|
|
|
5’10” / 178cm |
|
|
|
M |
L |
|
|
|
5’11” / 180cm |
|
|
|
|
L |
|
|
|
6’0” / 183cm |
|
|
|
|
L |
XL |
|
|
6’1” / 185cm |
|
|
|
|
L |
XL |
|
|
6’2” / 188cm |
|
|
|
|
|
XL |
|
|
6’3” / 191cm |
|
|
|
|
|
XL |
XXL |
|
6’4” / 193cm |
|
|
|
|
|
|
XXL |
|
6’5” / 196cm |
|
|
|
|
|
|
XXL |
|
6’6” / 198cm |
|
|
|
|
|
|
XXL |
Read our bike size guide for more information on sizing.
San Quentin Geometry
|
Size |
S |
M |
L |
XL |
|
Stack |
586.1 |
590.7 |
599.7 |
604.3 |
|
Reach
|
422 |
444 |
464 |
484 |
|
Head Tube Angle |
65 |
65 |
65 |
65 |
|
Head Tube Length |
105 |
110 |
120 |
125 |
|
Seat Tube Angle (Virtual) |
75 |
75 |
75 |
75 |
|
Seat Tube Angle (Actual) |
75 |
75 |
75 |
75 |
|
Seat Tube Length |
385 |
420 |
475 |
515 |
|
Top Tube (Actual) |
564 |
582 |
604 |
626 |
|
Top Tube (Effective) |
579.1 |
602.3 |
624.7 |
645.9 |
|
Bottom Bracket Height |
310 |
310 |
310 |
310 |
|
Bottom Bracket Drop |
50 |
50 |
50 |
50 |
|
Chain Stay |
425 |
425 |
425 |
425 |
|
Wheelbase |
1144.8 |
1168.9 |
1193.1 |
1215.3 |
|
Standover Height |
664 |
677 |
714 |
745 |
|
Fork Offset |
46 |
46 |
46 |
46 |
|
Seatpost Diameter |
30.9 |
30.9 |
30.9 |
30.9 |
|
Handlebar Width |
780 |
780 |
780 |
780 |
|
Stem Length |
45 |
45 |
45 |
45 |
|
Crank Length |
170 |
175 |
175 |
175 |
Read our Mountain Bike Geometry Explained guide for more information on MTB geometry.
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Marin San Quentin 24 2026 - Junior Bike
Available with supplier
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