2018 Borealis Fat Bikes Flume Base

Design
Flat Bar, Rigid, suspension corrected
Frame
Aluminum
Fork
Carbon/Composite
Features
Disc brake
Average stack and reachvs category
Average stack and reachvs category
Average stack and reachvs category
Somewhat upright stack and reachvs category

Geometry

S
M
L
XL
Stack
596.9mm
610.9mm
625.1mm
639.1mm
Reach
407.4mm
422.9mm
437.4mm
451.1mm
Stack to Reach Ratio
1.47:1
1.44:1
1.43:1
1.42:1
Seat Tube Length, C-T
381mm
432.1mm
484.1mm
533.9mm
Top Tube Length, Effective/Horizontal HT Top
604mm
610.1mm
629.9mm
650mm
Top Tube Slope
24.1deg
19.8deg
15.6deg
12deg
Head Tube Angle
70deg
70deg
70deg
70deg
Seat Tube Angle
73deg
73deg
73deg
73deg
Head Tube Length
104.9mm
119.9mm
134.9mm
150.1mm
Bottom Bracket Drop
59.9mm
59.9mm
59.9mm
59.9mm
Bottom Bracket Height
319.6mm
319.6mm
319.6mm
319.6mm
Chainstay Length
454.9mm
454.9mm
454.9mm
454.9mm
Chainstay Length Horizontal
451mm
451mm
451mm
451mm
Front-Center
659.9mm
680.4mm
699.9mm
718.7mm
Front-Center Horizontal
657.1mm
677.7mm
697.4mm
716.2mm
Wheelbase
1108.1mm
1128.7mm
1148.3mm
1167.1mm
Fork Offset/Rake
51mm
51mm
51mm
51mm
Trail
83.9mm
very high
83.9mm
very high
83.9mm
very high
83.9mm
very high
Mechanical Trail
78.8mm
78.8mm
78.8mm
78.8mm
Wheel Flop
27mm
27mm
27mm
27mm
Tire to Pedal Spindle
110.4mm
170 mm cranks
130.9mm
170 mm cranks
150.4mm
170 mm cranks
169.2mm
170 mm cranks
Pedal Spindle to Ground Clearance
149.6mm
170 mm cranks
149.6mm
170 mm cranks
149.6mm
170 mm cranks
149.6mm
170 mm cranks

Base Build

S
M
L
XL
Wheel Size
26 in
559 mm BSD
26 in
559 mm BSD
26 in
559 mm BSD
26 in
559 mm BSD
Tire Width
100mm
100mm
100mm
100mm
Tire Outer Diameter
759mm
759mm
759mm
759mm
Bike Length with Tires
1867.1mm
1887.7mm
1907.3mm
1926.1mm

Published Sizing Recommendations

Height
5 ft 2 in
to
5 ft 6 in
5 ft 5 in
to
5 ft 10 in
5 ft 9 in
to
6 ft 2 in
6 ft 1 in
to
6 ft 5 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
Rigid Fatbike
Source:https://www.fatbike.com/store/FLUME-EAGLE-NX-p124043621