2022 Marin Bikes Alcatraz Base

Design
BMX Bar, Hardtail (Front suspension)
Frame
Aluminum
Features
Disc brake
Very upright stack and reachvs category
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Somewhat upright stack and reachvs category
Suspension sag unknown
Geometry may mis-represent actual riding geometry

Geometry

SHORT
LONG
Stack
575mm
580mm
Reach
385mm
430mm
Stack to Reach Ratio
1.49:1
1.35:1
Seat Tube Length, Unknown
320mm
320mm
Top Tube Length, Effective/Horizontal Center
600mm
646mm
Top Tube Slope
28.9deg
27.3deg
Head Tube Angle
69deg
69deg
Seat Tube Angle
69deg
69deg
Head Tube Length
115mm
120mm
Bottom Bracket Drop
22mm
22mm
Bottom Bracket Height
315.9mm
315.9mm
Chainstay Length
395mm
395mm
Chainstay Length Horizontal
394.4mm
394.4mm
Front-Center
643mm
689mm
Front-Center Horizontal
642.6mm
688.6mm
Wheelbase
1037mm
1083mm
Fork Offset/Rake
42mm
42mm
Trail
84.7mm
very high
84.7mm
very high
Mechanical Trail
79.1mm
79.1mm
Wheel Flop
28.4mm
28.4mm
Standover Height
370mm
400mm
Tire to Pedal Spindle
135.1mm
170 mm cranks
181mm
170 mm cranks
Pedal Spindle to Ground Clearance
145.9mm
170 mm cranks
145.9mm
170 mm cranks

Base Build

SHORT
LONG
Wheel Size
26 in
559 mm BSD
26 in
559 mm BSD
Tire Width
2.3in
2.3in
Tire Outer Diameter
675.8mm
675.8mm
Bike Length with Tires
1712.8mm
1758.8mm

Published Sizing Recommendations

Height
5 ft 1 in
to
5 ft 9 in
5 ft 6 in
to
6 ft 3 in

Stack and Reach vs. Category Trend

Very Upright
Somewhat Upright
Average
Somewhat Aggressive
Very Aggressive

The Bike Insights Upright/Aggressive scale is based on analysis of a bike’s proportions relative to similar sized bikes in the same category.

Learn more about the Upright/Aggressive Scale
Category Trend
BMX/Dirt Jump
Source:https://www.marinbikes.com/ww/bikes/2022-alcatraz-frame-kit