Marin Bolinas Ridge 1 ST 27.5" Mountain Bike 2026 - Hardtail MTB

The Marin Bolinas Ridge 1 ST 27.5 is an easy-to-use mountain bike with a step-through frame, the Bolinas Ridge 1 ST is designed for comfort and confidence. It’s well suited to new riders exploring paths, parks and light off-road terrain.
Key Features:
- Series 1 6061 aluminium step-through frame with low standover
- SR Suntour XCE Disc fork with 100mm travel and preload adjust
- Shimano Tourney 2x7-speed drivetrain
- Tektro MDM280 mechanical disc brakes
- 27.5" wheels with 2.25" MTB tyres
- Upright riding position for comfort and control
- Wide gear range for varied terrain
- Available with 0% APR finance
The Marin Bolinas Ridge 1 ST 27.5 is built to make cycling more accessible and enjoyable, especially for riders who prefer a lower step-through frame. This design makes getting on and off the bike easier, while also improving confidence at slower speeds or when stopping on uneven ground.
The Series 1 aluminium frame offers a balance of durability and comfort, with geometry that promotes an upright riding position. This helps reduce strain on longer rides and improves visibility when riding on shared paths or local routes.
Up front, the SR Suntour XCE fork provides 100mm of suspension travel to smooth out bumps, gravel paths and light trail features. Preload adjustment allows you to fine-tune the feel based on rider weight and preference.
The Shimano Tourney 2x7 drivetrain offers a wide range of gears, making it easier to handle climbs and maintain a steady cadence on flatter terrain. Integrated shifters keep controls simple and intuitive for newer riders.
Mechanical disc brakes from Tektro deliver dependable stopping power in a variety of conditions, with straightforward maintenance and consistent performance.
Rolling on 27.5” wheels with 2.25” tyres, the bike provides a stable and comfortable ride, with enough grip for light off-road use while still rolling efficiently on smoother surfaces.
Overall, the Bolinas Ridge 1 ST is a practical and approachable mountain bike, ideal for riders looking to build confidence, enjoy relaxed rides and explore beyond the tarmac.
Occasionally, without notice, manufacturers change product design and/or specifications.
| Frame | Series 1 6061 Aluminum, 27.5”/29" Wheels, Low Standover, 68mm BB shell, 135mm Forged Dropouts, Chainstay Mounted Disc Brakes |
| Fork | SR Suntour XCE Disc, 100mm Travel, Preload Adjustment, 46mm Offset |
| Headset | FSA No.10-P |
| Stem | Marin Alloy, 31.8mm, 45mm |
| Bars | Marin 31.8 Riser, 12mm Rise, 780mm Width, XS/S models have 740mm Width. |
| Front Brake | Tektro MDM280 Mechanical Disc, 160mm Rotor |
| Rear Brake | Tektro MDM280 Mechanical Disc, 160mm Rotor |
| Brake Lever | Shimano w/ Integrated Shifters |
| Front Mech | Shimano FD-TX600 |
| Rear Mech | Shimano Tourney, 7-Speed |
| Shifters | Shimano Tourney 2x7-Speed |
| Speed | 7 |
| Rims | Marin, Double Wall Alloy |
| Front Hub | Forged Alloy, Disc, 32H |
| Rear Hub | Forged Alloy, Disc, 32H |
| Spokes | Black Stainless Steel |
| Front Tyre | MTB, 27.5/29x2.25" |
| Rear Tyre | MTB, 27.5/29x2.25" |
| Seat Post | Marin Alloy, 27.2mm |
| Saddle | Marin MTB |
| Bottom Bracket | Sealed Cartridge Bearings, Square Taper |
| Chain | KMC Z8 |
| Cassette | Shimano, CSHG200, 7-Speed, 11-32T |
| Pedals | Nylon Platform |
Bolinas Ridge Sizing
See the table below to find the right size Marin Bolinas Ridge.
|
Size |
XS |
S |
M |
L |
XL |
XXL |
|
Rider Height Range |
5’0” – 5’4” |
5’4” – 5’7” |
5’7” – 5’10” |
5’10” – 6’0” |
6’0” – 6’2” |
6’2” – 6’4” |
Read our bike size guide for more information on sizing.
Bolinas Ridge Geometry
|
Size |
S |
M |
L |
XL |
XXL |
|
Stack (mm) |
567 |
574 |
583 |
593 |
612 |
|
Reach (mm) |
387 |
420 |
432 |
434 |
432 |
|
Head Tube Angle |
71 |
72 |
72 |
72 |
72 |
|
Head Tube Length |
123 |
123 |
133 |
143 |
163 |
|
Seat Tube Angle Virtual |
74 |
73.5 |
73.5 |
73 |
72 |
|
Seat Tube Angle Actual |
74 |
73.5 |
73.5 |
73 |
72 |
|
Seat Tube Length (mm) |
381 |
432 |
483 |
521 |
559 |
|
Top Tube Actual (mm) |
535.6 |
566.6 |
581.6 |
592.3 |
606.8 |
|
Top Tube Effective (mm) |
550 |
590 |
605 |
615 |
630 |
|
Bottom Bracket Height (mm) |
283 |
283 |
283 |
283 |
283 |
|
Bottom Bracket Drop (mm) |
70 |
70 |
70 |
70 |
70 |
|
Chainstay (mm) |
445 |
445 |
445 |
445 |
445 |
|
Wheelbase (mm) |
1052 |
1070 |
1086 |
1090 |
1094 |
|
Standover Height (mm) |
663 |
705 |
748 |
779 |
811 |
|
Fork Offset |
51 |
45 |
45 |
45 |
45 |
|
Seatpost Diameter (mm) |
27.2 |
27.2 |
27.2 |
27.2 |
27.2 |
|
Handlebar Width (mm) |
680 |
680 |
680 |
680 |
680 |
|
Stem Length (mm) |
51 |
45 |
45 |
45 |
45 |
|
Crank Length (mm) |
170 |
175 |
175 |
175 |
175 |
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Marin Bolinas Ridge 1 ST 27.5" Mountain Bike 2026 - Hardtail MTB
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