Sir 9 29er Hardtail Steel Frame Yellow Medium - 1001140455
Niner Bikes SIR 9 29er Frame Niner Bikes SIR 9 29er Steel Frame At a time when carbon super bikes (including Niners own flagship models) dominate the stage, why would Niner shine a spotlight on the SIR 9? Perhaps its better to ask just what is it about steel bikes? Why, when we get on a steel frame, are we all instantly transported back to that first bike we had as a kid? Why is steel just as relevant today as it was 50 years ago while other materials have come and gone? There wasnt anything wrong with Niners SIR 9 like other Ninerds we rode it and loved it. But something about Steel being equated with Retro seemed almost unfair to such a great bike. There is simply no reason frames built with one of the best metals on the planet shouldnt benefit from and take full advantage of cool technologies like updated headsets standards, tapered forks and through axles. Introducing the new SIR 9 all the fun, all the advantages, all the steel. NEW TUBESET WITH AWARD WINNING NINER GEOMETRY - All steel is not created equal. The SIR 9 tubing is a custom-selected set that utilizes the best tube options for each application within the frame.For the front triangle, we employ the new Reynolds 853 DZB (Double Zone Butting) tubing. Developed for mountain bikes, and specifically 29ers, Reynolds 853 DZB offers two significant advantages:Downtube fork clearance in 29ers is tricky because of the relatively high HT-to-BB height. A straight downtube needs to be welded high on the back of the headtube to achieve fork clearance, often requiring either a gusset between the headtube and the downtube or a thicker heavier downtube to achieve desired strength. The Reynolds 853 DZB tube overcomes these limitations by incorporating two different butting profiles on the same downtube extra strength at the headtube combines with a butting profile in the rest of the tube that maintains ride quality and avoids weight penalties strong where we need it, compliant where we want it. Another advantage and a significant first for this 853 DBZ tube is the proprietary bend. We worked with Reynolds to shape this tube for the SIR 9 so the tube can attach lower on the headtube, reducing front end torsional flex, increasing steering precision and adding strength. For the stays, we incorporate steel custom bent in 3 dimensions with investment cast bridges and dropouts for ride quality and tire clearance. This shaping is proprietary to Niner and is not found on other steel mountain bikes.