Marin Bolinas Ridge 2 27.5" Mountain Bike 2021 - Hardtail MTB
The Bolinas Ridge family of mountain bikes are designed for the recreational mountain biker looking to explore the local singletrack or dirt paths. Utilizing our lightweight Series 1 aluminum alloy frames, 100mm travel suspension forks, and reliable Shimano drivetrains, these bikes are capable of tackling real trails and pushing your own boundaries. Size-specific 27.5” or 29” wheels, disc brakes, and 2.25” MTB tires mean comfort, traction, and control through any rough terrain. Get outside and explore with the Marin Bolinas Ridge.
Key Features:
Series 1 Aluminum Frame.
The Bolinas Ridge series has a disc specific Series 1 6061 aluminum frame with a replaceable derailleur hanger and an integrated headset.
29” or 27.5” Wheels.
The Bolinas Ridge has a growing wheel size for the best fit and performance with the choice of 27.5” or 29” platforms on the size M, 27.5” wheels on size S, and 29” wheels on sizes L, XL, and XXL.
Disc Brakes.
All Bolinas Ridge models feature disc brakes for minimal maintenance and all-conditions stopping power.
Trail Ready Components.
The Bolinas Ridge line features durable double wall rims, serviceable cassette freehubs, proven Shimano drivetrains, and readily available parts that are built to last.
Occasionally, without notice, manufacturers change product design and/or specifications.
Frame | Series 1 6061 Aluminum, 27.5”/29" Wheels, Low Stanover, 68mm BB shell, 135mm Forged Dropouts, Chainstay Mounted Disc Brakes |
Fork | SR Suntour XCM DS 27.5”, 100mm Travel, Preload Adjustment, 46mm Offset |
Headset | FSA No.10-P |
Stem | Marin Alloy, 31.8 Bar Bore, 45mm |
Bars | Marin 31.8 Riser, 12mm Rise, 780mm Width |
Front Brake | Power CX7 Mechanical Disc, Shimano Pad Compatible, 160mm Rotor |
Rear Brake | Power CX7 Mechanical Disc, Shimano Pad Compatible, 160mm Rotor |
Brake Lever | Shimano w/ Integrated Shifters |
Front Mech | Shimano FD-TY700 |
Rear Mech | Shimano Altus, 8-Speed |
Shifters | Shimano ST-EF51 3x8-Speed |
Speed | 24 |
Rims | Marin, Double Wall Alloy |
Front Hub | Forged Alloy, 6-Bolt Disc, 32H |
Rear Hub | Forged Alloy, 6-Bolt Disc, 32H |
Spokes | 15g 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 |
Chainset | Shimano FC-TY301, 42/34/24t |
Bottom Bracket | Sealed Cartridge Bearings, Square Taper |
Chain | KMC Z51 |
Cassette | SunRace 8-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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