Marin San Quentin 20 2026 - Kids Bike









- Stout Series 2 aluminum frame for durability and agility
- SR Suntour XCM suspension fork with 80mm travel for bump absorption
- Shimano Altus 8-speed drivetrain for smooth shifting
- Tektro kid's specific hydraulic disc brakes for reliable stopping power
- Marin double wall alloy rims with Vee Tire Crown Gem 20x2.6" tyres for traction and durability
- Available with 0% APR finance for easy affordability
Occasionally, without notice, manufacturers change product design and/or specifications.
| Frame | Series 2 661 Aluminum, 20” Wheels, Disc Specific, 135mm Dropouts |
| Fork | SR Suntour XCM 24 BOOST, 80mm Travel, 110mm Axle Spacing |
| Headset | FSA No. 10P |
| Stem | Marin Alloy, 35mm |
| Bars | Marin Riser, 31.8 clamp, 3mm Rise, 59mm Width |
| Front Brake | Tektro HD-J285 Kid's Specific Hydraulic Disc |
| Rear Brake | Tektro HD-J285 Kid's Specific Hydraulic Disc |
| Brake Lever | Tektro Kid's Specific Short Reach Lever for Hydraulic Brake |
| Rear Mech | Shimano Altus |
| Shifters | Shimano Altus SL-M315, 8-Speed |
| Speed | 8 |
| Rims | Marin, Double Wall Alloy, 25mm 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, 20x2.6”, Wire Bead |
| Rear Tyre | Vee Tire Crown Gem, 20x2.6”, Wire Bead |
| Seat Post | Marin Alloy, 3.9mm |
| Saddle | Marin Kids MTB |
| Chainset | Forged Alloy, Narrow Wide 3T, 14mm |
| Bottom Bracket | Sealed Cartridge Bearings, Square Taper |
| Chain | KMC Z8 |
| Cassette | Shimano 8-speed, 11-32T |
| 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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