- Detail Images
NinerSIR 9Mountain Bike Frame
Item # NNR0069
Find your size
Note: Actual inseam is not the same as pant inseam.
Based on the measurements you entered, this is the size we recommend in this bike.
Our size calculator is a starting point for finding the right size for you. To get personal advice talk to one of our fit experts at 1.888.276.7130 or chat now
What do you think about this product?
November 28, 2020
What is the recommended fork offset for this frame? I assume the longer 51 mm and not the shorter 42 mm or 44 mm?
Lindsay Gilbert - Gearhead
November 28, 2020
October 11, 2019
What bottom bracket do I need if using a Shimano XT M8100 drivetrain? Thanks!
November 1, 2019
Hi. If you are using the Shimano XT crank you need this BB: Item # WHL000E
April 30, 2018
Heavy Metal Trail Hardtail
- I've put it through the wringer
I am 5'11" and have a 32" inseam. I went with a size large frame and it fits great. I built mine up from the frame up (Deity cockpit, Ergon saddle & grips, PNW Components Bachelor Dropper, Rockshox Pike 130mm, GX Eagle drivetrain, and Guide RSC brakes) and it has been so fun. I've ran it with both 29" wheels (pictured here) and 27.5+ wheels - I personally prefer 27.5+ hands down. Its not that light, in fact I like to call it Heavy Metal!! (Insert rock hands here) What I like about it: - Pretty capable for a hardtail. I absolutely smash down rowdy trails and it can hold its own! Generally not as fast as a full squish bike, but its a steel hardtail that is a blast to ride. Not sure if its the steel frame or not, but it holds its own for sure. I definitely felt that the 27.5+ were more confidence inspiring on the downhill - better traction and feels like it lowers the bottom bracket a bit. - Short chainstays make for a snappy bike, just pretty playful in general. - Reynolds 853 Steel frame gives a lively feel on the trail. I would love to try a direct comparison of a non steel version (I know this doesn't exist) but does have a springy feel that is just fun to ride. What I don't like: - While I wasn't entirely concerned about the weight, it really is not a light bike (again, Heavy Metal). I think mine weighs in at 31-32ish lbs with my Crank Brother stamp pedals. - Niner says it should fit 29" tires that are up to 2.5" depending on brand - a Schwalbe 2.35" Nobby Nic mounted on Industry Nine Trail 245 wheels practically do not fit and rubs on hard cornering. Seriously millimeters of clearance. For having Niner as a name and barely fitting a pretty normal size tire on not that wide of rims is a bit weak. No issue with plus size tires though! If you're looking for a hardtail and are more concerned about having a rad time out on the trail than bother counting grams, this could be the bike for you! Feel free to reach out if you do have any questions on it or if you'd like any help putting together a custom build for yourself!
October 16, 2020
Same issue with tire clearance running 29. I have a Rekon 2.25 on a 30 mm inner rim and it clears but not by much. A 2.3 DHR basically didn't clear. Not sure where they're getting the 2.5 number, unless they changed the rear triangle as of the orange and blue version, which I doubt. Just a quibble though. It's a really fun bike.