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- Niner's most versatile steel hardtail for dirt connoisseurs
- Run singlespeed or geared
- Custom drawn, 29er specific Reynolds 853 tubeset
- angled toptube to maximize standover clearance
- s-bend chainstays
- Niner's proven hardtail 29er geometry
- Optimized for 80 to 100mm suspension forks
- Disc brake only
- Niner BioCentric EBB system for easy singlespeed set up
- Breezer style forged vertical dropouts with 2 derailleur hanger options (singlespeed or geared)
The S.I.R. 9 is the most versatile bike in the Niner stable, fusing the “steel is real” feel of Reynolds tubing with the ability to run the frame as either a geared bike or single speed. The S.I.R. 9 uses the same custom drawn Reynolds 853 tubing as the M.C.R. 9 and combines it with Niner’s ultra-light eccentric bottom bracket. Custom “breezer” style forged dropouts have a replaceable alloy derailleur hanger and come with an |
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- Niner's most versatile steel hardtail for dirt connoisseurs
- Run singlespeed or geared
- Custom drawn, 29er specific Reynolds 853 tubeset
- angled toptube to maximize standover clearance
- s-bend chainstays
- Niner's proven hardtail 29er geometry
- Optimized for 80 to 100mm suspension forks
- Disc brake only
- Niner BioCentric EBB system for easy singlespeed set up
- Breezer style forged vertical dropouts with 2 derailleur hanger options (singlespeed or geared)
The S.I.R. 9 is the most versatile bike in the Niner stable, fusing the “steel is real” feel of Reynolds tubing with the ability to run the frame as either a geared bike or single speed. The S.I.R. 9 uses the same custom drawn Reynolds 853 tubing as the M.C.R. 9 and combines it with Niner’s ultra-light eccentric bottom bracket. Custom “breezer” style forged dropouts have a replaceable alloy derailleur hanger and come with an insert piece for running the bike as a single speed to eliminate the unnecessary derailleur hanger for a clean look.
Niner’s own EBB, at 100 grams, is the lightest eccentric bottom bracket on the market. In addition to being light, it’s extremely functional. The EBB has more swing than any other EBB, over a full link, so you will never have to hunt down a half link to get correct chain tension and vertical dropouts mean you’ll never have to futz with the disc brake to remove the wheel.
The S.I.R. 9 is truly a do-everything frame. Run it single speed at your local race, then convert it to a full gear set to do the Trans-Alp. Want a 1 x 9? No problem. Or, if you’re just not sure, the S.I.R. 9 will give you the option of trying it all.
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No more creaks, no more rounded EBB shells, no more debate about which system is best. Niner’s new Bio-Centric bottom bracket system eliminates ALL of the issues with any eccentric bottom bracket system in an amazingly simple way: It’s a two piece design.
One of the Bio-Centric’s cups goes into the frame on the driveside of a normal 68mm EBB shell. The other goes into the frame on the non-drive side. There is an offset bolt that goes in from the non-drive side cup and threads into the drive side cup. The combination of this offset bolt, and the close tolerance of the Bio-Centric cup’s internal fit means that the threads for the bottom bracket line up automatically. Rotate one cup around the EBB shell, and the other will rotate with it, keeping the threads for the bottom bracket aligned. Any minor mis-alignment of these threads will be corrected once the bottom bracket and cranks are installed.
The final part of the puzzle, the one that solves all of the current EBB problems, are the flanges on the outside of the Bio-Centric’s cups. These flanges go ALL the way around the EBB shell, and clamp down against the side wall of the shell as the offset bolt is tightened. |
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No more creaks, no more rounded EBB shells, no more debate about which system is best. Niner’s new Bio-Centric bottom bracket system eliminates ALL of the issues with any eccentric bottom bracket system in an amazingly simple way: It’s a two piece design.
One of the Bio-Centric’s cups goes into the frame on the driveside of a normal 68mm EBB shell. The other goes into the frame on the non-drive side. There is an offset bolt that goes in from the non-drive side cup and threads into the drive side cup. The combination of this offset bolt, and the close tolerance of the Bio-Centric cup’s internal fit means that the threads for the bottom bracket line up automatically. Rotate one cup around the EBB shell, and the other will rotate with it, keeping the threads for the bottom bracket aligned. Any minor mis-alignment of these threads will be corrected once the bottom bracket and cranks are installed.
The final part of the puzzle, the one that solves all of the current EBB problems, are the flanges on the outside of the Bio-Centric’s cups. These flanges go ALL the way around the EBB shell, and clamp down against the side wall of the shell as the offset bolt is tightened.
By using the sides of the shell to secure the EBB, Niner eliminates ANY possibility of rounding out the EBB shell, one of the plaguing problems of current EBB systems. In addition, by having 360° of contact around the EBB shell, the Bio-Centric’s cups SEAL the EBB from dirt and grime, which are the number one cause of creaking in other EBB systems. This seal also keeps moisture out of the system which is the key to noiseless EBB operation.
The Bio-Centric EBB has gone through over a year and a half of real world and simulated fatigue testing before we finalized the design, including a brutal CEN chain torque fatigue simulation test that put the Bio-Centric through it’s paces. The new EBB design went 100,000 cycles with no slipping or breakage.
Simple, light, and strong, we feel like the Bio-Centric is the perfect solution to chain tensioning needs. With one 6mm hex wrench, the EBB can be adjusted on the fly and in the field, and it’s still the lightest EBB system on the market.
Welcome to the new standard in EBB design, the Niner Bio-Centric EBB.
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Chris and Steve, Niner's founders, talk about the features of the S.I.R. 9. VIEW VIDEO | |
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Chris and Steve, Niner's founders, talk about the features of the S.I.R. 9. VIEW VIDEO | |
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SPECIFICATIONS & COMPATIBILITY: - 73mm BB width
- 27.2mm seatpost size
- 29.6mm seat collar size (not included)
- 28.6mm front derailleur, low-mount, top swing, bottom pull
- When using a front derailleur the Bio-Centric should be in the 3 o'clock position
- Standard 1.125” external bearing headset (not included)
- Replaceable derailleur hanger or SS insert
- Size Small has one inner triangle bottle mount and one under the downtube bottle mount
- Sizes Medium, Large and XL have two inner triangle bottle mounts
- 135mm QR rear spacing
- Can fit up to a 2.4” tire (tire size varies by brand, some tires may not fit)
- Compatible with current-standard 3x chainring systems
- Compatible with current-standard 3x chainring systems
- 2x chainring system recommendations:
- SRAM configs: 26/39 or lower
- SHIMANO XT configs: 28/40 or lower
- SHIMANO XTR double cranks have a non-standard chainline and are not recommended.
- The Niner EBB is designed for use with external bearing cranksets only
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SPECIFICATIONS & COMPATIBILITY: - 73mm BB width
- 27.2mm seatpost size
- 29.6mm seat collar size (not included)
- 28.6mm front derailleur, low-mount, top swing, bottom pull
- When using a front derailleur the Bio-Centric should be in the 3 o'clock position
- Standard 1.125” external bearing headset (not included)
- Replaceable derailleur hanger or SS insert
- Size Small has one inner triangle bottle mount and one under the downtube bottle mount
- Sizes Medium, Large and XL have two inner triangle bottle mounts
- 135mm QR rear spacing
- Can fit up to a 2.4” tire (tire size varies by brand, some tires may not fit)
- Compatible with current-standard 3x chainring systems
- Compatible with current-standard 3x chainring systems
- 2x chainring system recommendations:
- SRAM configs: 26/39 or lower
- SHIMANO XT configs: 28/40 or lower
- SHIMANO XTR double cranks have a non-standard chainline and are not recommended.
- The Niner EBB is designed for use with external bearing cranksets only
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XTR BUILD KIT |
| XTR | | BRAKES & ROTORS | | Shimano XTR M985, 160MM Rotors | | BRAKE LEVERS | | Shimano XTR M985 | | R/ SHIFTER | | Shimano XTR M980 10sp | | F/ SHIFTER | | Shimano XTR M980 3sp | | R/ DERAILLEUR | | Shimano XTR M985 SGS Medium Cage 10sp | | F/ DERAILLEUR | | Shimano XT M781 10sp | | CASSETTE | | Shimano XTR M980 11-36 10sp | | CHAIN | | Shimano XTR M980 10sp | | CRANK SET | | Shimano XTR M980 42/32/24 | | BOTTOM BRACKET | Shimano XT BB
Shimano XTR BB | | SADDLE | | Fizik Gobi XM, Black, Manganese Rail | | HANDLEBAR | | Niner Flat Top Carbon, Red Graphic | | STEM | | Niner Alloy, Red Graphic | | SEATPOST | | Niner Carbon, Red Graphic | | GRIPS | | Crank Bros Iodine, Black |
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XT BUILD KIT |
| XT | | BRAKES & ROTORS | | Shimano XT M785, 160MM Rotors | | BRAKE LEVERS | | Shimano XT M785 | | R/ SHIFTER | | Shimano XT M780 10sp | | F/ SHIFTER | | Shimano XT M780 3sp | | R/ DERAILLEUR | | Shimano XT M780 SGS Medium Cage 10sp | | F/ DERAILLEUR | | Shimano XT M781 10sp | | CASSETTE | | Shimano XT M771 11-36 10sp | | CHAIN | | Shimano XT HG-94 10sp | | CRANK SET | | Shimano XT M780 42/32/24 | | BOTTOM BRACKET | Shimano XT BB
Shimano XTR BB | | SADDLE | | Fizik Gobi XM, Black, Manganese Rail | | HANDLEBAR | | Niner Flat Top Carbon, Red Graphic | | STEM | | Niner Alloy, Red Graphic | | SEATPOST | | Niner Carbon, Red Graphic | | GRIPS | | Crank Bros Iodine, Black |
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X7 BUILD KIT |
| SRAM X7 (GXP or PF30) | | BRAKES & ROTORS | | SRAM Elixir 3, Pewter 180/160MM Rotors | | BRAKE LEVERS | | SRAM Elixir 3, Pewter w/Matchmaker | | R/ SHIFTER | | SRAM X7 10sp | | F/ SHIFTER | | SRAM X7 2sp | | R/ DERAILLEUR | | SRAM X7 Long Cage 10sp | | F/ DERAILLEUR | | SRAM X9 10sp | | CASSETTE | | SRAM PG-1050 10sp 12-36 | | CHAIN | | KMC X10L 10sp | | CRANK SET | | SRAM X7 38/24, GXP or PF30 | | BOTTOM BRACKET | | SRAM GXP or PF30 | | SADDLE | | WTB Silverado Race SL, Black, Crmo Rails | | HANDLEBAR | | Niner Flat Top Carbon, Red Graphic | | STEM | | Niner Alloy, Red Graphic | | SEATPOST | | Niner Carbon, Red Graphic | | GRIPS | | WTB Weirwolf Dual Density |
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X0 BUILD KIT |
| SRAM X0 (GXP or PF30) | | BRAKES & ROTORS | | Formula R1X, 180/160MM Rotors | | BRAKE LEVERS | | Formula R1X | | R/ SHIFTER | | SRAM X0, Red Graphic 10sp | | F/ SHIFTER | | SRAM X0, Red Graphic 2sp | | R/ DERAILLEUR | | SRAM X0 Long Cage, Red Graphic 10sp | | F/ DERAILLEUR | | SRAM X9 10sp | | CASSETTE | | SRAM PG-1070 10sp 12-36 | | CHAIN | | KMC X10L 10sp | | CRANK SET | | SRAM X0 38/24, Red Graphic, GXP or PF30 | | BOTTOM BRACKET | | SRAM GXP or PF30 | | SADDLE | | WTB Silverado Team, Black, NiCro Tub. Rails | | HANDLEBAR | | Niner Flat Top Carbon, Red Graphic | | STEM | | Niner Alloy, Red Graphic | | SEATPOST | | Niner Carbon, Red Graphic | | GRIPS | | WTB Weirwolf Dual Density |
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Niner Build Kit Options Complete your parts kit and customize your Niner with suspension forks from Fox or Rock Shox and wheelsets from Sun-Ringle and Stans. Prefer a rigid fork? Niner Steel, Carbon and RDO forks are a perfect complement to your Niner hardtail. Complete specs are available as a PDF Download. Talk to your Niner dealer for availability and pricing. |
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NINER GREEN |
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MOONDUST GREY | |
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The S.I.R. 9 frame retails for $899.00 and includes the Niner Bio-Centric Bottom Bracket and both singlespeed and rear-derailleur compatible dropouts. To order a Niner bicycle, find and contact your local dealer here. If you do not have a local dealer, contact us. |
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The S.I.R. 9 frame retails for $899.00 and includes the Niner Bio-Centric Bottom Bracket and both singlespeed and rear-derailleur compatible dropouts. To order a Niner bicycle, find and contact your local dealer here. If you do not have a local dealer, contact us. |
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 | "Niner is the only multi-bike brand based entirely around 29" wheels. Its deveotion to the 'big revolution', as it calls it, is showcased beautifully in the S.I.R. 9."
|  | Best of MTBr 2007, 2008 & 2009
Three Time Winner
MTBr.com Reader’s Award
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