Marin Alcatraz 2024 Frame Kit

The Alcatraz allows the rider to follow in Matt Jones’ footsteps to build and personalize the best dirt jump bike possible. At home boosting your local 6 pack, ripping up the pump track, or hitting the local skate park the Alcatraz has what you need to take care of business.

The Alcatraz features a 6061 Series 3 alloy frame, with a burly double butted tubesets for the best ride quality and stiffness, tapered headtubes for maximum strength on big jumps, and horizontal drop out with slotted IS disc brake tabs.

We have optimized the chainstay length of the Alcatraz to make sure you can have the shortest chainstays possible, giving you the ability to pop a wheelie or manual anywhere at anytime.

The Alcatraz features 135×10mm horizontal dropouts — the standard in dirt jump technology for axle and dropout strength.

Slopestyle

Pump track

Skate park

Specification

Frame	Series 3 6061 Aluminum Frame, 26” Wheels, 135×10mm Horizontal Dropouts, 73mm Threaded BB, ISCG 05 Tabs
HEADSET	FSA No 57E, Semi-Sealed Cartridge Bearings, 1 1/8” × 1 1/2”
Extras	Marin Chain Tension Device
Extras	Marin MTB Seat Clamp, Bolt Type

Specifications are subject to change without notice

Geometry

Frame Size	Short	Long
A – Stack	575	580
B – Reach	385	430
C – Headtube Angle	69°	69°
D – Headtube Length	115	120
E – Seattube Angle	69°	69°
F – Seattube Length	320	320
G – Toptube Effective	600	646
H – BB Height	317	317
I – BB Drop	22	22
J – Chainstay	395	395
K – Wheelbase	1037	1083
L – Standover Height	370	400
M – Fork Offset	42	42
Seatpost Diameter	30.9	30.9
Handlebar Width	750	750
Stem Length	40	40
Crank Length	170	170

Want to compare the size of your current bike to this one? Read our Reach and Stack guide here.