The flip chip is a simple way to adjust the geometry on your Firebird 29. It allows you to either adjust the geometry for different trail conditions (using 29” wheels) or can allow for the use of 27.5” wheels with 2.6”-2.8” tires and a 27.5” rear/29” front “reverse mullet” setup as well. The chip comes set up in the low BB setting.  This is perfect for riding fast, technical and steep terrain. However, if your preference is for a little more crank clearance and slightly quicker handling for tighter terrain with more climbing and/or roots and rocks, you may prefer the high BB setting.  The high BB setting will raise the bottom bracket and steepen the head angle by ½ degree giving the bike faster turn in. The high setting is also a great starting point for running a 27.5” rear/29” front “reverse mullet” setup. Additionally, if you want to run 27.5” wheels with 2.6”-2.8” tires, you would also need to run the bike in the High BB setting combined with our 17mm extended headset cup (more on that below). The combination of the higher BB setting and the taller cup allow the smaller diameter wheels to be used while maintaining the same geometry and similar BB height to the bike set up with 29” wheels.