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I stand exactly 5 ' 7 tall. So about 5 '7 1/2 with cycling shoes on. Short inseam, long arm/torso.

Opinions on size S or M niner air 9 frame?
 

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big legs, small brains
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Measure the BB to saddle height on your current ride and use that measurement to figure out the geometry on the Niner. I have a 30" inseam and am on a medium.
 

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big legs, small brains
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p nut said:
Shouldn't you measure the TT as well?
Sure should.... As well as stem length, bar rise, saddle fore/aft, etc..... If you want the best set up go to your local Niner store and demo one.
 

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I am the same height and body style as you I got a SMALL fits great wish i could still get some seat height out of it but that will never happens on a 29er.
 

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Get the small - I am 5' 7 3/4 and I ride a medium, but I have a 31.5 inseam and short torso. I can make the small work so I know you could.
 

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Buy one and ride it. Then let me know, because I'm having the same issue, it's either a small all stretched out or a medium with a short stem. I haven't found anyone yet around 5'7 that has ridden one on a regular basis. Either way I'm sure it will be fine once you get it dialed in.
 

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Niners have a fairly long effective top tubes, keep that in mind. I am the same height and rode a small el mariachi for a couple of years (22.8" ett) and it felt great with a 90mm stem. My medium cannon 29er 1fg doesn't feel as good from a sizing standpoint, and I may eventually go back to a small. Your best bet, though, is to ride them both for an extended period of time, assuming your shop will let you......
 

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30-ton War Machine
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I am 5'6" with a 30" inseam, if I move my junk to the side, and I ride a small, I could ride a medium but, I like the way the small fits and it just feels like home for me.
 

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gone for a bike ride
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i'm 5 eight & have no grumbles about my medium 9 carbon

using a 90mm stem with 620mm bars + 350mm seatpost for my 31 inch legs

on another thread someone with a small a9c has problems using a full sized water bottle & complained that only small/medium bottles fit the frame - i'm very happy not to have that problem :)

good luck
 

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small member
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I'm 5'7'' too and I've been through the same question. we're right at the limit between sizes.
I think it depends on your type of riding.
If you're into racing, endurance, efficiency, covering ground at speed on "easy" terrain, go with the medium.
If you're more into recreationnal trail riding, with the odd small jump or log crossing mixed in, go with the small.
I hope it makes sense for you.
 

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kylemason said:
Measure the BB to saddle height on your current ride and use that measurement to figure out the geometry on the Niner. I have a 30" inseam and am on a medium.
This measurement is virtually useless in determining the proper frame size. Instead you should focus more on the effective top tube of a frame.
 

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Scooterist
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I`m 5`7, and on a medium. I had a small sir and don`t notice the difference in size.

I had a longer stem and setback post on the sir so the virtual TT is the same and standover is good on Niners bikes.

AC9 with 90mm stem and streight post

Bicycle tire Tire Bicycle frame Wheel Winter


Sir with setback and 100mm stem.

Bicycle tire Bicycle wheel Bicycle frame Tire Bicycle fork
 

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melonp said:
Get the small - I am 5' 7 3/4 and I ride a medium, but I have a 31.5 inseam and short torso. I can make the small work so I know you could.
He said that his body is basically the opposite of yours. He has a "long" torso and short inseam which would "ideally" make the medium a better fit for him than for yourself.
Long torso matches up better with a longer TT.
 

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wedge said:
I'm 5'7'' too and I've been through the same question. we're right at the limit between sizes.
I think it depends on your type of riding.
If you're into racing, endurance, efficiency, covering ground at speed on "easy" terrain, go with the medium.
If you're more into recreationnal trail riding, with the odd small jump or log crossing mixed in, go with the small.
I hope it makes sense for you.
I somewhat agree.

I had a medium years ago. Had to run a 50mm stem in order to put myself where I like to be. I liked having two bottle cages, but when I got my latest Niner I went with the small.

I race endurance, but I set my bike up for fun. If all I was doing is laying down watts and riding less mountainous terrain I woulda stayed with the medium and a slightly longer stem.

Oh yeah...

5' 6.5"
 

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Flat Ark said:
He said that his body is basically the opposite of yours. He has a "long" torso and short inseam which would "ideally" make the medium a better fit for him than for yourself.
Long torso matches up better with a longer TT.
Funny I am asking the same question myself and I am 5'7 and 1/2 maybe. I have a longer torso and smaller legs and I am thinking medium but like others have said I am going to demo. I am looking at a Rip9 though but then looking for a single speed One 9 or Air 9.
 

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I was in between for the RIP 9 Med/LG. I had rode a Medium Jet9, so I spoke with the Niner guys and went with the Medium, could not be happier. 6' w/ 32" inseam. Sitting at 110 on the stem. Debating a setback on the seatpost, not sure.
 

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Huh? Right.....what I meant was if I had a shorter inseam I would want a small. A longer inseam puts me up to a medium. I have friends who are 5'9 and 5'10 with the same inseam.
 
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