Niner 2020 SIR 9 2-STAR Hardtail Mountain Bike (Slate Blue/Orange)

Price: $2,600.00
Discontinued Online
This item is discontinued and no longer available for purchase. You may want to search our site for a similar item.

There’s a new bike in town and it’s built to last, not let you down. When you’re spinning up steep climbs, bombing down the backcountry and grinding out the final miles as the sun sinks into the horizon, you need a bike you can trust. A comfortable, capable, hand-built bike made from proven, air-hardened, heat-treated steel. That’s right, steel. Because Steel Is Real and it’s fully optimized in the SIR 9.

The classic steel fame construction gives you the comfortable, durable, capable, "ride hard, put away wet" mentality that you have always wanted in a frame. To make it even more capable Niner strapped a 120mm fork up front, added no fewer than 18 threaded mounting bosses, and provided clearance for up to 29 x 2.4' tires so that you can go farther and stay out longer.


  • Reynolds 853 steel frame construction because "steel is real"
  • No fewer than 18 mounting bosses for bags, racks, bottles, and more
  • Biocentric 30 bb gives you the freedom to run whatever drivetrain you desire
  • Trail ready geometry provides a longer top tube and slacker head tube for more stability at speed
  • Integrated dropper post routing for a clean setup
  • Tire clearance for up to 29 x 2.4" or 27.5+ tires

Frame: Hand Welded Reynolds 853 steel  
Front Wheel: Niner alloy clincher (15 x 110mm TA)  
Front Tire: Maxxis Minion DHF 3C/EXO/TR (29" x 2.5" WT)  
Brakes: Sram Level
Rotors: Sram Level 
Front Shifter: N/A  
Front Derailleur: N/A  
Cassette: Sram PG 1210 (11-50t)  
BB: Sram Dub PF30
Seatpost: KS Lev SL  
Stem: Race Face Turbine R (40mm)  
Grips: Niner Grrrips w/ flange
Fork: Marzocchi Bomber Z2 Rail (120mm)
Rear Wheel: Niner alloy clincher (12 x 142mm TA)  
Rear Tire: Maxxis Rekon 3C/EXO/TR (29" x 2.4" WT)  
Chain: Sram SX Eagle 12sp
Rear Shifter: Sram SX Eagle 12sp  
Rear Derailleur: Sram SX Eagle 12sp  
Crankset: Sram X1 1K Eagle Dub (32t)  
Saddle: Niner Custom TR w/ crn-ti rails  
Handlebar: Race Face Aeffect R (780mm) (20mm Rise) (35mm Clamp)
Headset: Niner internal ZS

*Note: These bikes are fully built by our expert bike builders, then partially disassembled as needed for shipping. Bikes will arrive to you with some basic assembly still required. 

This product was added to our catalog on December 30, 2019

Sizing Recommendations for Riders Who Fall Between Sizes:

  • Sizing down will provide a more maneuverable ride while sizing up will provide more stability
Rider Height (Feet)Rider Height (Meters)
XS5' - 5'5"1.53 - 1.65m
S5'3" - 5'9"1.6 - 1.75m
M5'8" - 6'1.73 - 1.83m
L5'11" - 6'3"1.8 - 1.91m
XL6'3" - 6'7"1.91 - 2.01m

Note: All sizing recommendations are provided by the manufacturer and may differ for each rider.


Fork Travel120mm120mm120mm120mm
(A) Top Tube Length595mm603mm627mm652mm
(B) Seat Tube Length396mm421mm485mm533mm
(C) Chainstay Length Actual430mm430mm430mm430mm
(D) Horizontal Chainstay427mm427mm427mm427mm
(E) Front Center693mm711mm737mm764mm
(F) Wheelbase1118mm1136mm1162mm1189mm
(G) Bottom Bracket Drop52mm52mm52mm52mm
(H) Headtube Length100mm110mm125mm145mm
(I) Headtube Angle68.0°68.0°68.0°68.0°
(J) Seat Tube Angle74.0°74.0°74.0°74.0°
(K) Standover Height721mm739mm791mm830mm
(L) Reach410mm425mm445mm465mm
(M) Stack611mm620mm634mm652mm
Fork Travel120mm120mm120mm120mm
(A) Top Tube Length23.4"23.7"24.7"25.7"
(B) Seat Tube Length15.6"16.6"19.1"21"
(C) Chainstay Length Actual16.9"16.9"16.9"16.9"
(D) Horizontal Chainstay16.8"16.8"16.8"16.8"
(E) Front Center27.3"28"29"30.1"
(F) Wheelbase44"44.7"45.7"46.8"
(G) Bottom Bracket Drop2"2"2"2"
(H) Headtube Length3.9"4.3"4.9"5.7"
(I) Headtube Angle68.0°68.0°68.0°68.0°
(J) Seat Tube Angle74.0°74.0°74.0°74.0°
(K) Standover Height28.4"29.1"31.1"32.7"
(L) Reach16.1"16.7"17.5"18.3"
(M) Stack24"24.4"24.9"25.7"