2021 Kona Bicycle Company Fire Mountain Base S

Build

650B/27.5 in × 2.25 in

Insights

Somewhat aggressive stack and reach vs trend of hardtail trail mtb bikes
Design deviates from other sizes of Kona Bicycle Company Fire Mountain
Suspension sag unknown
Geometry may mis-represent actual riding geometry

Stack and Reach vs. Category Trend
View all sizes

Geometry

Stack
585mm
Reach
415mm
Stack to Reach Ratio
1.41:1
Seat Tube Length, Unknown
370mm
Top Tube Length, Effective/Horizontal Unknown
572mm
Top Tube Slope
23.9deg
Head Tube Angle
68deg
Seat Tube Angle
74deg
Head Tube Length
100mm
Bottom Bracket Drop
50mm
Bottom Bracket Height
299.2mm
Chainstay Length
435mm
Chainstay Length Horizontal
432.1mm
Front-Center
678mm
Front-Center Horizontal
676.9mm
Wheelbase
1109mm
Fork Offset/Rake
42mm
Fork Length, Unknown
490mm
Trail
95.8mm
very high
Mechanical Trail
88.8mm
Wheel Flop
33.3mm
Standover Height
654.9mm
Tire to Pedal Spindle Distance
With 170 mm cranks
158.9mm
Pedal Spindle to Ground Clearance
With 170 mm cranks
129.2mm

Base Build

Wheel Size
650B, 27.5 inch (584mm BSD)
Tire Width
2.25in
Tire Outer Diameter
698.3mm
Bike Length with Tires
1807.3mm
Suspension Type
Hardtail (Front suspension)
Bar Type
Flat Bar
Fork Travel
100mm
Suspension Sag
Unknown
Frame Material
Aluminum
Fork Material
Aluminum
Brake Type
Disc
Source:https://konaworld.com/fire_mountain.cfm