2012 Niner SIR 9 - 2012 - Road Bike Shop
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|Niner S.I.R. 9 Mountain Bike Frame - 2014
Aside from an occasional oddball, like magnesium or something from the kingdom Plantae, material choices for mountain bike frames are aluminum, steel, and carbon fiber. Each one has distinct advantages and disadvantages, and the amount of time that's been spent deviling into their nuances is...