Marin San Quentin 3 27.5 Mountain Bike
Marin San Quentin 3 27.5 Mountain Bike Angle

San Quentin 3 27.5 Bike


Regular price$3,188.00
No tax included. Shipping calculated at checkout.


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Bike and frame supply has vastly improved since the pandemic, but pre-ordering is still essential for some models and sizes. Hope HB916 frames are made to order too, so we have updated our pandemic bike deposit policy to take the current situation into consideration.

Please note - we can only deliver complete bikes to UK Addresses.

The ETA's (estimated times of arrival) we quote are from the information provided by the manufacturers and distributors. These dates are not guaranteed, as the manufacturers are also at the mercy of component suppliers. We will tell you the same dates as the manufacturer tells us.

We only take deposits on bikes we have on order with suppliers and have confirmation that we are going to receive them. We want to make it clear that there might be issues outwith our control that will prevent us from supplying the bike you want. If that happens, we will do our best to provide an alternative.

Deposits are non-refundable, except for when an ETA date changes by a month or more. If it looks like the date might change, we will do our best to find you an alternative.

If a bike arrives earlier than expected, it will be offered to the person with the oldest outstanding deposit, then the second, and so on. We'll then offer the bike to anyone with a similar bike on order. We should point out that this is a rare occurrence!

Bikes and frames up to £3500 require a £500 deposit.
Bikes over £3500 require a £1000 deposit.

We ring-fence deposits in a separate bank account until the balance of the bike or frame is paid, then the bike or frame is delivered.

We've tried to be as honest and open about the situation as it stands and not make promises we know we are not in the position to fulfil! We have great relationships with our suppliers, and we will work with them and you to try to get you your bike as soon as possible.

If you've read this and have any questions or would like to place a deposit, please phone us on 01330 828562.

We offer free UK delivery on all bikes unless bought through a Ride To Work Scheme.

We don't currently deliver complete bikes outside the UK.

Custom-built bikes can be delivered in kit form (for you to assemble) - we can include shipping to your country in your quote.

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Sale price bikes bought though Cycle To Work schemes will have a handling fee added.

This information is intended as a guide only.

Cycle To Work is a Government Initiative to encourage cycling to work. The idea is that by cycling to work, you get fitter and healthier, and at the same time reduce congestion and improve air quality.

In simplest terms, your employer pays for the bike, and you hire it from them through salary deductions. At the end of the hire period, the employer can sell you the bike. (Until the bike is paid for, you hire it from your employer, so don't get fired).

Your employer might administer the scheme themselves, or use a third party like one of the following:

Green Commute Initiative
Cycle Solutions
My Benefits World

If your employer doesn't offer Cycle To Work as a benefit, you can send them this employer information from the Government that outlines how it all works.

For more information, click here to contact us or call 01330 828562.

Sorry, we can't ship this item to New Zealand.

27.5 is sometimes called the "fun" wheel size and this bike is a shining example of why that is! Marin makes a big deal about the bike being influenced by their Alcatraz dirt jump frame and having development input from freerider Matt Jones.

Marin's San Quentin 3 is the top of their 27.5 range of hardtails, so the spec is great and the frame has refinements over the other models in the range. The tubing is more advanced with fully internal cable routing, but more importantly as far as we're concerned, the rear axle is Boost 148 mm spaced. Wider spacing allows the wheel builder to use a wider hub, allowing for a stiffer rear wheel, and opening up the choices should you want to upgrade the wheels in future.

The frame also features ISCG05 chainguide tabs; adding a guide makes a big difference to chain retention when you've no rear suspension on rougher trails.


Frame Series 3 6061 Aluminum, Double Butted Frame, Internal Cable Routing, Hardtail, 30.9 mm Seatpost, 148x12 mm Boost Rear Axle, 160 mm Post Mount Brake Mount, 73 mm Threaded BSA BB
Front Suspension Marzocchi Bomber Z2, RAIL Damper, 140 mm Travel, 37 mm Offset, 27.5, 110x15 mm Boost Axle
Rear Suspension
Front Wheel 27.5, Hub: Shimano HB-TC500. Rim: Marin Aluminum Double Wall, 29 mm Internal Width, 32h, 110x15 mm Boost, Centrelock
Rear Wheel 27.5, Hub: Shimano FH-TC500, MS Driver. Rim: Marin Aluminum Double Wall, 29 mm Internal Width, 32h 148x12 mm Boost, Centrelock
Front Tyre Maxxis Assegai 2.5", 3C MaxxTerra, EXO, TR, 27.5
Rear Tyre Maxxis Assegai 2.5", 3C MaxxTerra, EXO TR, 27.5
Derailleur Shimano Deore M6100, SGS, Shadow+, 12 Speed
Shift Lever Shimano Deore M6100-IR, Rapidfire Plus, I-Spec EV, 12 Speed
Crankset FSA Comet, 170 mm, MegaTooth Technology, 52 mm Chainline , 32T Chainring
Chain KMC X12, 12 Speed
Cassette Sunrace, 11-51T, 12 Speed
Front Brake TRP Slate Evo
Front Brake Rotor TRP RS01, 203 mm, Centrelock
Rear Brake TRP Slate Evo
Rear Brake Rotor TRP RC01E, 180 mm, Centrelock
Handlebar Marin Mini-Riser, 6061 Double Butted Aluminum, 28mm Rise, 5º Up, 9º Back
Stem Marin 3D Forged Alloy
Grips Marin Grizzly Lock On
Headset FSA No 57E, Semi-Sealed Cartridge Bearings
Seatpost Brand X Ascend Internal
Saddle Marin Speed Concept
Pedals Marin Oso OE Flat

Geometry & Sizing

20Twenty Bike Sizing Chart

Marin San Quentin 27.5 Geometry

140 mm Fork

Sizes in MM S M L XL
A: Stack 618 622.5 631.5 636
B: Reach 422 450 470 500
C: Head Tube
64° 64° 64° 64°
D: Head Tube
110 115 125 130
E: Effective
Seat Tube Angle
77° 77° 77° 77°
F: Seat Tube
310 340 375 414
G: Effective
Top Tube
564.70 593.70 615.80 646.80
H: BB Height 316 316 316 316
I: BB Drop -50 -50 -50 -50
J: Chainstay Length 425 425 425 425
K: Wheelbase 1173.40 1203.60 1228 1260.20
L: Standover 627.7 656.40 664.80 681
M: Fork Offset 37 37 37 37
Handlebar Width 780 780 780 780
Stem Reach 35 35 35 35
Seatpost Diameter 30.9 30.9 30.9 30.9
Seatpost Drop 125 150 170 200
Size Rider Height
S 158 cm - 165 cm
M 165 cm – 173 cm
L 173 cm – 180 cm
XL 180 cm – 188 cm

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