Mountain Bike Action Bike Test: Niner Sir 9 2.0 Trail Bike


The first versions launched back in the day of the SIR 9 was designed to use a rigid fork or accommodate 80–100mm-travel forks. Now, the SIR 9 2.0 is designed for 120mm forks, but as we mentioned, our build had 130mm of front travel. Sticking to the recommended setting, we dialed in the Fox 34 SC Float Factory on this bike right at 30-percent sag and got to experiment with its abilities on the dirt.

Even if you decide to boost off roots the steel frame remains comfortable and durable.


The SIR 9 is made for a rider looking for a bike that can spend long days in the saddle, bombing the backcountry, bike-packing to remote camping sites and having all-around fun days on the dirt. The frame’s geometry is meant to satisfy this kind of rider with what Niner calls “trail country” geometry. The idea is to have a geometry that is a cross between modern trail and traditional cross-country.

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