Niner Bikes S.I.R. 9 29er Hardtail

4.79/5 (66 Reviews)
MSRP : $999.00

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Product Description

  • Custom engineered steel tubeset for ideal function and ride quality
  • Custom bent double-butted Reynolds 853 DZB down tube
  • 44mm Reynolds 631 head tube allows use of tapered or 1-1/8” forks
  • Niner BioCentric II Bottom bracket system and removable down tube cable stops allows clean singlespeed or geared setup
  • 142x12 rear Maxle
  • Post mount brake bosses between seat stay and chainstay
  • Investment cast stay bridges and dropouts

User Reviews

Overall Rating:5
Value Rating:4
Submitted by S.O.B. a Cross Country Rider

Date Reviewed: December 17, 2012

Strengths:    This is not your papa's steel. This frame is relatively light for a steel frame @ ~4.5lbs (2042g). Love the clean lines of a steel framed bike.

Weaknesses:    Some might say the ebb, but I prefer this to sliders. This particular frame is set up with gears, so the ebb is a non-issue. No weakness that I can come up with and I have had this bike for almost a year now.

Bottom Line:   
I always use to joke, Steel is real...real heavy! Not so much the case with the SIR 9.
Purchased this bike as a backup/wife's bike...built up geared (1x9) to be used by me on occasion in place of my lighter (stiffer) Scandium One 9. I was impressed that the frame was only ~1.2 lb (or ~540grams) more...what was amazing is how it felt on the trail. I took it to a familiar trail, very rooty, rocky, was noticably smoother, and with the components almost identical to the One 9, it was only ~2lbs heavier. Did I notice the weight? Sure I did, when picking it up to place on the car rack, I did not feel it on the trail...I thought maybe I did on the climbs, but that could be the placebo affect of knowing you are riding a bike 2lbs heavier than your normal ride. Love the bike and will certainly use it in the future where a geared bike makes more sense (like trails with steep, grainy climbs)...other than that, it will serve as my wife's main ride (glad we ride the same size bike). :)

Expand full review >>

Favorite Trail:   286 (NC) Auburn SRA

Duration Product Used:   9 months

Price Paid:    $700.00

Purchased At:   Back Alley Bikes

Similar Products Used:   Misfit Dissent, Niner One 9

Bike Setup:   Stans, Thomson, Schwalbe, Avid, XT, Reba...

S.I.R. 9 / Niner Headset Assembaly Question...

I have a Niner headset (shown in picture) and feel that I installed it correctly however there's the slightest gap thats created by the compression ring... is that supposed to be there? I'm holding off cutting the forks until i get this figured out... thanks for anyone that can provide some insight! ... Read More »

Niner S.I.R 9 vs One 9 RDO?

The previously mentioned bikes are on my shortlist for my new single speed. Has anyone had experience with either of these bikes? Good or Bad? Any idea on stock weights? Sorry if this subject has been beaten to death but the Almighty Google is giving me nothing. [url=] ... Read More »

New S.I.R. 9 - IMBA Limited Edition Auction starts tonight!

Want the new S.I.R. 9 with 44mm head tube and 142x12 spacing? Want one of 6 that we have had painted for our IMBA benefit? The auction starts tonight - as soon as it is live we will post the link here and on our Facebook page. 100% of auction proceeds from this brand new product launch go to IMB ... Read More »

Niner S.I.R. 9 - First SS, First Build

So my first real post on mtbr, taken me a while, need to stop being such a lurker. (My first 5 were so I could post this in the SS forum, rather than general). I want to build a SS 29er, I've got some idea of the kind of bike I want, and I have the money (or will as I buy components) to put it t ... Read More »

Niner S.I.R. 9 Opinions

Hey guys what do you think of the Bio-Centric BB system? I am pretty much at wit's end for the ideal steel bike for SS and geared platform. I go either a Niner or something else. A bike I can race with but have fun with a SS, it must be steel or ti. A bike frame to end it all.Read More »

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