2024 Niner Bikes SIR 9 Frameset (29" wheels)
- Category
- Hardtail Cross-country MTB
- Design
- Flat Bar, Hardtail (Front suspension)
- Frame
- Steel
- Suspension
- 120mm fork travel, 20% sag
- Features
- Disc brake
Geometry
Small | Medium | Large | Extra Large | |
Stack | 611mm | 620mm | 634mm | 652mm |
Reach | 410mm | 425mm | 445mm | 465mm |
Stack to Reach Ratio | 1.49:1 | 1.46:1 | 1.42:1 | 1.4:1 |
Seat Tube Length, C-T | 396mm | 421mm | 485mm | 533mm |
Top Tube Length, Effective/Horizontal Center | 595mm | 603mm | 627mm | 652mm |
Top Tube Slope | 23.9deg | 21.7deg | 16.2deg | 12.9deg |
Head Tube Angle | 68deg | 68deg | 68deg | 68deg |
Seat Tube Angle | 74deg | 74deg | 74deg | 74deg |
Head Tube Length | 100mm | 110mm | 125mm | 146mm |
Bottom Bracket Drop | 52mm | 52mm | 52mm | 52mm |
Bottom Bracket Height | 320mm | 320mm | 320mm | 320mm |
Chainstay Length | 430mm | 430mm | 430mm | 430mm |
Chainstay Length Horizontal | 426.8mm | 426.8mm | 426.8mm | 426.8mm |
Front-Center | 693.1mm | 711.1mm | 737mm | 763.9mm |
Front-Center Horizontal | 691.2mm | 709.2mm | 735.2mm | 762.2mm |
Wheelbase | 1118mm | 1136mm | 1162mm | 1189mm |
Fork Offset/Rake | 44mm | 44mm | 44mm | 44mm |
Trail | 102.8mm very high | 102.8mm very high | 102.8mm very high | 102.8mm very high |
Mechanical Trail | 95.3mm | 95.3mm | 95.3mm | 95.3mm |
Wheel Flop | 35.7mm | 35.7mm | 35.7mm | 35.7mm |
Standover Height | 721mm | 739mm | 791mm | 830mm |
Tire to Pedal Spindle | 151.2mm 170 mm cranks | 164.1mm 175 mm cranks | 190mm 175 mm cranks | 217mm 175 mm cranks |
Pedal Spindle to Ground Clearance | 150mm 170 mm cranks | 145mm 175 mm cranks | 145mm 175 mm cranks | 145mm 175 mm cranks |
Frameset (29" wheels) Build
Small | Medium | Large | Extra Large | |
Wheel Size | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD | 700C/29 in 622 mm BSD |
Tire Width | 2.4in | 2.4in | 2.4in | 2.4in |
Tire Outer Diameter | 743.9mm | 743.9mm | 743.9mm | 743.9mm |
Bike Length with Tires | 1861.9mm | 1879.9mm | 1905.9mm | 1932.9mm |
Crank Length | 170mm | 175mm | 175mm | 175mm |
Handlebar Width | 780mm | 780mm | 780mm | 780mm |
Stem Length | 40mm | 40mm | 40mm | 50mm |
Published Sizing Recommendations
Height | 5 ft 3 in to 5 ft 9 in | 5 ft 8 in to 6 ft 0 in | 5 ft 11 in to 6 ft 3 in | 6 ft 3 in to 6 ft 7 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 ScaleCategory Trend
Hardtail Cross-country MTBSource:https://www.ninerbikes.com/sir-9-frames-only/