Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Niner
2021 Niner SIR 9 4-Star
Previous used estimate
$1,732 - $1,781
Actual value depends on condition, size, and local demand.
Value Guide market data · 2021 Niner SIR 9 4-Star
12-month projected trend
13%
Direction and magnitude, not judgment
vs. category average
8%
Drops faster than category avg
Price over time - 2021 Niner SIR 9 4-Star
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All SIR model years
Overview
About this bike
The SIR 9 is a comfortable, capable, hand-built bike made from proven, air-hardened, heat-treated Reynolds 853 steel. When you're spinning up the steeps, bombing down the backcountry, and grinding out the final miles as the sun sinks into the horizon, you need a bike you can trust. This 4-Star SIR 9 is dressed for success with a light, stiff FOX 34 120mm travel suspension fork, Shimano XT drivetrain, and DT Swiss M1700 wheels. No excuses—get out and ride! - DT Swiss M1700 wheels - FOX 34 SC Float Factory EVOL FIT 4 fork w/Kashima coat, 120mm travel - KS LEV Si dropper post
Specifications
- Subtype
- Cross Country
- Category
- Mountain
- Component Fork
- Fox 34 SC Float Factory EVOL Fit4, 3 Position w/Adj, Kashima Coat, 120mm, 110x15mm, 44mm Offset
- Component Size
- Small, Medium, Large, X-Large
- Component Stem
- Race Face Turbine R 40mm, 35mm Clamp
- Product Family
- SIR
- Component Chain
- Shimano XT M8100 w/Quicklink
- Component Color
- Cement/Black/Copper
- Component Frame
- Hand welded Reynolds 853 steel; external cable routing; integrated bottle, bag, rack and fender mounts; 12x148 thru axle
- Component Brakes
- Shimano XT M8100, Metal Pad w/Fin
- Component Pedals
- Sold separately
- Component Rotors
- 180/160 MT800 Rotors
- Component Saddle
- Niner Custom TR With CrN-Ti Rails, Printed Niner Graphic
- Component Headset
- Niner Internal ZS SHIS Description ZS44/28.6|ZS56/40
- Component Crankset
- Raceface NEXT R Carbon 12sp, 32T
- Component Seatpost
- KS LEV Si (XS/S-100mm, M/L/XL-150mm)
- Component Shifters
- Shimano XT M8100 12sp I-Spec EV
- Component Handlebar
- Race Face NEXT R 800mm Wide, 35mm Rise, 35mm Clamp
- Component Wheel Set
- Front: DT Swiss XM 1700 Spline 30, Center Lock 110x15mm Rear: DT Swiss XM 1700 Spline 30, Center Lock 148x12mm
- Component Front Tire
- Front: Schwalbe Nobby Nic Evo Super Trail TLE Addix Speedgrip 2.6" Rear: Schwalbe Nobby Nic Evo Super Trail TLE Addix Speedgrip 2.35"
- Component Tape Grips
- Niner Grrrips L/O Soft Compound
- Component Brake Levers
- Shimano XT M8100
- Component Bottom Bracket
- Raceface PF30
- Component Rear Derailleur
- Shimano XT M8100 SGS 12sp
- Component Accessories Extras
- Stans No Tubes Sealant (2 x 2oz Bottles)
- Component Cassette Freewheel
- Shimano XT M8100 12sp, 10-51T
- Crankset
- Raceface NEXT R Carbon 12sp, 32T
- Pedals
- Sold separately
- Bottom Bracket
- Raceface PF30
- Chain
- Shimano XT M8100 w/Quicklink
- Seatpost
- KS LEV Si (XS/S-100mm, M/L/XL-150mm)
- Saddle
- Niner Custom TR With CrN-Ti Rails, Printed Niner Graphic
- Handlebar
- Race Face NEXT R 800mm Wide, 35mm Rise, 35mm Clamp
- Headset
- Niner Internal ZS SHIS Description ZS44/28.6|ZS56/40
- Rear Derailleur
- Shimano XT M8100 SGS 12sp
- Stem
- Race Face Turbine R 40mm, 35mm Clamp
- Accessories & Extras
- Stans No Tubes Sealant (2 x 2oz Bottles)
- Brake Levers
- Shimano XT M8100
- Brakes
- Shimano XT M8100, Metal Pad w/Fin
- Fork
- Fox 34 SC Float Factory EVOL Fit4, 3 Position w/Adj, Kashima Coat, 120mm, 110x15mm, 44mm Offset
- Frame
- Hand welded Reynolds 853 steel; external cable routing; integrated bottle, bag, rack and fender mounts; 12x148 thru axle
- Shifters
- Shimano XT M8100 12sp I-Spec EV
- Tape/Grips
- Niner Grrrips L/O Soft Compound
- Color
- Cement/Black/Copper
- Size
- X-Large
- Cassette/Freewheel
- Shimano XT M8100 12sp, 10-51T
- Rotors
- 180/160 MT800 Rotors
- Wheel Set
- Front: DT Swiss XM 1700 Spline 30, Center Lock 110x15mm Rear: DT Swiss XM 1700 Spline 30, Center Lock 148x12mm
- Front Tire
- Front: Schwalbe Nobby Nic Evo Super Trail TLE Addix Speedgrip 2.6" Rear: Schwalbe Nobby Nic Evo Super Trail TLE Addix Speedgrip 2.35"
What to check when buying used
Inspection
Drivetrain wear
Check chain stretch, cassette teeth, chainrings, and shifting under load before negotiating price.
Inspection
Service history
Ask for service records covering bearings, brakes, drivetrain, and any frame or fork warranty work.
Inspection
Suspension service
Confirm fork and rear shock service intervals and check pivot bearings for play.