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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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| << PREVIOUS PAGE |
NEXT PAGE >> |
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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- All measurements based on a FOX 80mm travel fork with 44mm rake offset and the EBB in the 6 o'clock position
- 27.2mm seat post, 400mm length recommended
- 73mm bottom bracket shell
- 28.6 front derailleur clamp, bottom pull, low mount (top swing)
- 29.6mm seat clamp diameter
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| SMALL (IN/MM) | MEDIUM (IN/MM) | LARGE (IN/MM) | X-LARGE (IN/MM) | | (A) EFFECTIVE TOP TUBE LENGTH | | 23.1/587 | 23.75/603 | 24.5/622 | 25.25/641 | | (B) SEAT TUBE LENGTH | | 15.5/394 | 16.5/419 | 19/483 | 21.5/546 | | (C) CHAIN STAY LENGTH | | 17.3/440 | 17.3/440 | 17.3/440 | 17.3/440 | | (D) FRONT CENTER | | 25.3/643 | 25.8/656 | 26.5/673 | 27.3/693 | | (E) WHEELBASE | | 42.3/1073 | 42.7/1085 | 43.5/1104 | 44.3/1124 | | (F) BB DROP | | 2.8/70 | 2.8/70 | 2.8/70 | 2.8/70 | | (G) HEAD TUBE LENGTH | | 3.5/90 | 3.9/100 | 4.3/110 | 5.1/130 | | (H) SEAT TUBE ANGLE | | 73° | 73° | 73° | 73° | | (I) HEAD TUBE ANGLE | | 71.5° | 72° | 72° | 72° | | STAND-OVER HEIGHT | | 27.8/706 | 28.6/728 | 30.7/780 | 32.8/832 | | HEIGHT RECOMMENDATION | | 5'3"-5'9"/ 1.6-1.75m | 5'8"-6'/ 1.73-1.83m | 5'11"-6'3"/ 1.8-1.91m | 6'3"-6'7"/ 1.91-2.01m |
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Niner Build Kit Options |
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| XT | SLX | | MSRP (NOT INCLUDING FRAME) | | $2,678 | $2,299 | | FORK OPTIONS |
RockShox Reba XX 1-1/8” 100 QR, White or Black
RockShox Reba XX 1-1/8” 100 20mm, White or Black
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RockShox Reba XX 1-1/8” 100 QR, White or Black
RockShox Reba XX 1-1/8” 100 20mm, White or Black
| | HEADSET | | Cane Creek S1 Black | Cane Creek S1 Black | | SEAT POST | | Thomson Elite | Truvative Stylo Race | | SEAT CLAMP | | DKG Bolt On Black | DKG Bolt On Black | | TIRE OPTION |
Conti Mountain King 29x2.4
Conti Race King 29x2.2
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Conti Mountain King 29x2.4
Conti Race King 29x2.2
| | WHEELSET OPTIONS |
ZTR Hub/355 Rims
ZTR Hub/Flow Rims
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ZTR Hub/355 Rims
ZTR Hub/Flow Rims
| | CRANKS | | Shimano XT 10spd 175mm triple | Shimano SLX 10spd 175mm triple | | CHAIN | | Shimano XT | Shimano SLX | | CASSETTE | | Shimano XT 10spd 11-36 T | Shimano SLX 10spd 11-36 T | | DERAILLEURS | | Shimano XT | Shimano SLX | | SHIFTERS | | Shimano XT | Shimano SLX | | SADDLE | | Fizik Gobi Black | Fizik Gobi Black | | HANDLEBAR | | Niner Flat Top Black | Niner Flat Top Black | | STEM | | Thomson X4 (80, 90, 100mm options) | Truvative Stylo Race (75, 90, 100mm options) | | GRIPS | | WTB Weirwolf | WTB Weirwolf | | BRAKES AND BRAKE LEVERS | | Shimano XT w 160mm rotors | Shimano SLX w 160mm rotors |
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A&W ROOT BEER |
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SOLID GOLD |
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KERMIT GREEN |
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MOONDUST GREY | |
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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."
 DOWNLOAD COMPLETE REVIEW
|  | "The S.I.R. 9 is light, fast, flexible, and comfortable for the long haul. It is an alternative to complicated and expensive full-suspension bikes for those riders who appreciate the simpler things in life."
DOWNLOAD COMPLETE REVIEW
|  | Best of MTBr 2007, 2008 & 2009
Three Time Winner
MTBr.com Reader’s Award
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The S.I.R. 9 frame retails for $849.00 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 $849.00 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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