Kona Big Unit, not to be confused with the steel unit—this is a Scandium aluminum frame(medium). This is a great, fast 29er with race ready components. Chris King throughout(including BB), and really nice newer SRAM Guide brake set. I love the handling of this bike and the 120mm travel Reba fork performs well. The gearing is set up ideally with the 29 inch wheels (tubeless) with 32/18 chainring/cog.