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