2018 Brother Cycles Big Bro Base

Category
Rigid MTB
Design
Flat Bar, Rigid, suspension corrected
Frame
Steel
Fork
Steel
Features
Disc brake
Somewhat upright stack and reachvs category
Average stack and reachvs category
Average stack and reachvs category
Somewhat upright stack and reachvs category

Geometry

Small (16)
Medium (18)
Large (20)
xLarge (22)
Stack
598mm
605mm
616mm
630mm
Reach
392mm
410mm
427mm
437mm
Stack to Reach Ratio
1.53:1
1.48:1
1.44:1
1.44:1
Seat Tube Length, C-T
406mm
457mm
508mm
559mm
Top Tube Length, Effective/Horizontal HT Top
575mm
595mm
615mm
630mm
Top Tube Length, Actual C-C
556mm
571mm
590mm
607mm
Top Tube Slope
22.3deg
17.2deg
12.8deg
9deg
Head Tube Angle
69.5deg
70deg
70.5deg
70.5deg
Seat Tube Angle
73deg
73deg
73deg
73deg
Head Tube Length
95mm
100mm
110mm
125mm
Bottom Bracket Drop
60mm
60mm
60mm
60mm
Bottom Bracket Height
308.2mm
308.2mm
308.2mm
308.2mm
Chainstay Length
445mm
445mm
445mm
445mm
Chainstay Length Horizontal
440.9mm
440.9mm
440.9mm
440.9mm
Front-Center
644.9mm
659.8mm
674.7mm
690.7mm
Front-Center Horizontal
642.1mm
657.1mm
672.1mm
688.1mm
Wheelbase
1083mm
1098mm
1113mm
1129mm
Fork Offset/Rake
46mm
46mm
46mm
46mm
Fork Length (Axle-To-Crown)
483mm
483mm
483mm
483mm
Trail
88.6mm
very high
85.1mm
very high
81.6mm
very high
81.6mm
very high
Mechanical Trail
83mm
79.9mm
76.9mm
76.9mm
Wheel Flop
29.1mm
27.3mm
25.7mm
25.7mm
Standover Height
782mm
810mm
840mm
871mm
Tire to Pedal Spindle
106.7mm
170 mm cranks
121.6mm
170 mm cranks
136.5mm
170 mm cranks
152.5mm
170 mm cranks
Pedal Spindle to Ground Clearance
138.2mm
170 mm cranks
138.2mm
170 mm cranks
138.2mm
170 mm cranks
138.2mm
170 mm cranks

Base Build

Small (16)
Medium (18)
Large (20)
xLarge (22)
Wheel Size
650B/27.5 in
584 mm BSD
650B/27.5 in
584 mm BSD
650B/27.5 in
584 mm BSD
650B/27.5 in
584 mm BSD
Tire Width
3in
3in
3in
3in
Tire Outer Diameter
736.4mm
736.4mm
736.4mm
736.4mm
Bike Length with Tires
1819.4mm
1834.4mm
1849.4mm
1865.4mm
Handlebar Width
730mm
730mm
730mm
730mm
Stem Length
70mm
70mm
70mm
70mm

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
Rigid MTB
Source:https://www.brothercycles.com/shop/bikes/big-bro-complete/