2019 Niner Bikes SIR 9 Frameset (27.5" wheels) SM
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 | 611mm |
| Reach | 410mm |
| Stack to Reach Ratio | 1.49:1 |
| Seat Tube Length, C-T | 396mm |
| Top Tube Length, Effective/Horizontal HT Top | 595mm |
| Top Tube Slope | 23.9deg |
| Head Tube Angle | 68deg |
| Seat Tube Angle | 74deg |
| Head Tube Length | 100mm |
| Bottom Bracket Drop | 52mm |
| Bottom Bracket Height | 311.1mm |
| Chainstay Length | 430mm |
| Chainstay Length Horizontal | 426.8mm |
| Front-Center | 693mm |
| Front-Center Horizontal | 691.2mm |
| Wheelbase | 1118mm |
| Fork Offset/Rake | 51.3mm |
| Trail | 91.4mm very high |
| Mechanical Trail | 84.8mm |
| Wheel Flop | 31.8mm |
| Standover Height | 721mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 159.9mm |
| 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 | 1844.2mm |
| 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 3 in to 5 ft 9 in |
Source:https://ninerbikes.com/products/sir-9?variant=18665213427810