2019 Niner Bikes SIR 9 Frameset (27.5" wheels) MD

Build

650B/27.5 in × 2.8 in

Insights

Average stack and reach vs trend of hardtail trail mtb bikes
Suspension sag unknown
Geometry may mis-represent actual riding geometry

Stack and Reach vs. Category Trend
View all sizes

Geometry

Stack
620mm
Reach
425mm
Stack to Reach Ratio
1.46:1
Seat Tube Length, C-T
421mm
Top Tube Length, Effective/Horizontal HT Top
603mm
Top Tube Slope
21.7deg
Head Tube Angle
68deg
Seat Tube Angle
74deg
Head Tube Length
110mm
Bottom Bracket Drop
52mm
Bottom Bracket Height
311.1mm
Chainstay Length
430mm
Chainstay Length Horizontal
426.8mm
Front-Center
711mm
Front-Center Horizontal
709.2mm
Wheelbase
1136mm
Fork Offset/Rake
50.7mm
Trail
92mm
very high
Mechanical Trail
85.3mm
Wheel Flop
32mm
Standover Height
739mm
Tire to Pedal Spindle Distance
With 170 mm cranks
177.9mm
Pedal Spindle to Ground Clearance
With 170 mm cranks
141.1mm

Frameset (27.5" wheels) Build

Wheel Size
650B, 27.5 inch (584mm BSD)
Tire Width
2.8in
Tire Outer Diameter
726.2mm
Bike Length with Tires
1862.2mm
Stem Length
40mm
Suspension Type
Hardtail (Front suspension)
Bar Type
Flat Bar
Fork Travel
120mm
Suspension Sag
Unknown
Frame Material
Steel
Fork Material
Unknown
Brake Type
Disc
Features
Single-speed capable

Published Sizing Recommendations

Height
5 ft 8 in
to
6 ft 0 in
Source:https://ninerbikes.com/products/sir-9?variant=18665213427810