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



Our test riders felt that the build we rode was a great mix of high-end yet affordable components; however, we would have loved to have thrown on a carbon wheelset instead of the alloy Stan’s we tested, just to feel the bike ride a little bit lighter on the trail. If you are a diehard fan of 27.5+, you could always have a second wheelset to run what you’d prefer on particular terrain. We know a PF30 bottom bracket is not the most popular feature, especially for bike packers, given that specialty tools are needed if problems arise; however, you could install an eccentric insert known as Niner’s BioCentric30. With that upgrade, a threaded bottom bracket could easily be installed. Yes, 120mm of front-end travel is what the SIR 9 2.0 frame was intended for, but, as we mentioned earlier, the 130mm fork we tested did not feel like it sacrificed performance in any way.


The Niner SIR 9 2.0 is a reliable frame with well-priced build options to give any rider miles of enjoyment. Okay, so it’s not a park bike, but it does the job of bringing you on an adventure to the top of almost any mountain, perhaps even a multi-day journey with your buddies. We feel that the type of rider purchasing this bike will most likely modify the bike with parts to meet his or her needs. Luckily for this type of consumer, the frame is highly compatible with various options, even if the buyer wanted to change setups, season to season or week to week. Overall, the SIR 9 2.0 is a great hardtail that happily brings to mind the phrase, “Steel is real.”

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