Marin Alcatraz Dirt Jump Mountain Bike Frame
Marin Alcatraz Frame Front

Alcatraz Frame


Regular price£535.00
VAT included. Shipping calculated at checkout.

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.

OK, so this is the first thing we've added to the site that doesn't really fit in with our Enduro-only ethic! Pump tracks and skateparks are bang on for keeping your fitness and skills up during the shorter days. If you're lucky enough to live near a pump track, you've probably already realised how much fun they are, without committing to getting soaked and covered in mud.

This frame is made to be responsive, made from Series 3 6061 Aluminium with beefy double butted aluminium tubing and a tapered headtube. The Alcatraz has short chain stays with the DJ standard 135x10 horizontal drop-outs. Two sizes are available.

An awesome base for your jump bike build!

  • 135x10mm horizontal dropouts.
  • 6061 Series 3 aluminium frame.
  • Tapered headtube.
  • Slotted IS disc brake tabs.
  • 73 mm threaded BB with ISCG05 tabs.
  • 30.9 seat tube.


Frame Series 3 6061 Aluminum, Double Butted Frame, Internal Cable Routing, Hardtail, 30.9 mm Seatpost, 135x10 mm Horizontal Rear Axle, IS Brake Mount, 73 mm Threaded BSA BB
Rear Suspension None -
Headset FSA No 57E, Semi-Sealed Cartridge Bearings

Geometry & Sizing

Marin Alcatraz Geometry
Sizes in MM Short Long
A: Stack 575 580
B: Reach 385 430
C: Head Tube
69° 69°
D: Head Tube
115 120
E: Effective
Seat Tube Angle
69° 69°
F: Seat Tube
320 320
G: Effective
Top Tube
600 646
H: BB Height 317 317
I: BB Drop 22 22
J: Chainstay Length 395 395
K: Wheelbase 1037 1083
L: Standover 370 400
M: Fork Offset 42 42
Seatpost Diameter 30.9 30.9
Stem Length 40 40
Crank Length 170 170


Size Rider Height
Short 155 cm - 175 cm
Long 168 cm - 190 cm