I rode one of these for eight years. The 29er version is the lightest and fastest MTB frame that I offer. I’ll be frank here- Aluminum for a mountain bike frame is really great in that it is very stiff and light. The drawback is that it has a finite fatigue life. Mine lasted eight years, through a season of racing and many crashes. I’m old man. I think that if I were in my 20’s racing every weekend on this frame I would get two seasons it. That said, I think that for the cross country racers out there this is the best tool for the job that I offer. The frame has hardware from Ahrens Design- the seat stay yoke and the rear dropouts. I do offer this in boost for either 27.5 or 29″ wheels.