Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Niner
2021 Niner AIR 9 RDO 4-Star
Previous used estimate
$1,591 - $1,637
Actual value depends on condition, size, and local demand.
Value Guide market data · 2021 Niner AIR 9 RDO 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 AIR 9 RDO 4-Star
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All AIR model years
Compare AIR 9 RDO 4-Star models
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Overview
About this bike
Our flagship carbon fiber hardtail: AIR 9 RDO. Niner's purest expression of light, stiff Race Day Optimized carbon fiber rules the racecourse. This efficient yet compliant frame makes the most of carbon's unique properties to give you the best ride, no matter if you're gunning for a podium or cruising local singletrack. This 4-Star Shimano XT AIR 9 RDO is dressed for success with a 100mm travel suspension fork, Shimano XT drivetrain, and DT Swiss XR 1700 SPLINE 25 wheels. No excuses—get out and ride! - DT Swiss XR 1700 SPLINE 25 wheels - FOX 32 SC Float Factory FIT 4 EVOL fork w/Kashima coat, remote lockout, 100mm travel - Shimano XT 2-piston "race" brakes
Specifications
- Subtype
- Cross Country
- Category
- Mountain
- Component Fork
- Fox 32 SC Float Factory EVOL FIT4, w/Remote L/O, Kashima Coat, 100mm, 110x15mm, 44mm Offset
- Component Size
- X-Small, Small, Medium, Large, X-Large
- Component Stem
- Niner RDO Stem, Niner Graphic
- Product Family
- AIR
- Component Chain
- Shimano XT M8100 w/Quicklink
- Component Color
- Satin Carbon/Silver, Sand/Orange
- Component Frame
- Niner RDO Carbon Fiber, Internal Cable Routing, PF30 BB, Single-Speed Compatible
- Component Brakes
- Shimano XT M8100, Metal Pad w/Fin
- Component Pedals
- Sold separately
- Component Rotors
- 180/160 Shimano MT800
- Component Saddle
- Niner Custom With CrN-Ti Rails, Embossed Niner Graphic
- Component Headset
- Niner Integrated SHIS Description IS42/28.6|IS52/40
- Component Crankset
- Raceface NEXT R Carbon 12sp, 32T
- Component Seatpost
- Niner RDO Seat Post, 400mm, Niner Graphic
- Component Shifters
- Shimano XT M8100 12sp I-Spec EV
- Component Handlebar
- Niner Flat Top RDO, 780mm, Niner Graphic
- Component Wheel Set
- Front: DT Swiss XR 1700 Spline 25, Center Lock 110x15mm Rear: DT Swiss XR 1700 Spline 25, Center Lock, 148x12mm
- Component Front Tire
- Front: Schwalbe Racing Ray EVO Super Terrain TLE Addix Speedgrip 2.35" Rear: Schwalbe Racing Ralph EVO Super Terrain TLE Addix Speed 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
- Niner RDO Seat Post, 400mm, Niner Graphic
- Saddle
- Niner Custom With CrN-Ti Rails, Embossed Niner Graphic
- Handlebar
- Niner Flat Top RDO, 780mm, Niner Graphic
- Headset
- Niner Integrated SHIS Description IS42/28.6|IS52/40
- Rear Derailleur
- Shimano XT M8100 SGS 12sp
- Stem
- Niner RDO Stem, Niner Graphic
- 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 32 SC Float Factory EVOL FIT4, w/Remote L/O, Kashima Coat, 100mm, 110x15mm, 44mm Offset
- Frame
- Niner RDO Carbon Fiber, Internal Cable Routing, PF30 BB, Single-Speed Compatible
- Shifters
- Shimano XT M8100 12sp I-Spec EV
- Tape/Grips
- Niner Grrrips L/O Soft Compound
- Color
- Sand/Orange
- Size
- X-Large
- Cassette/Freewheel
- Shimano XT M8100 12sp, 10-51T
- Rotors
- 180/160 Shimano MT800
- Wheel Set
- Front: DT Swiss XR 1700 Spline 25, Center Lock 110x15mm Rear: DT Swiss XR 1700 Spline 25, Center Lock, 148x12mm
- Front Tire
- Front: Schwalbe Racing Ray EVO Super Terrain TLE Addix Speedgrip 2.35" Rear: Schwalbe Racing Ralph EVO Super Terrain TLE Addix Speed 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.