With the new Genius, we wanted to make sure that versatility was still achieved. Unlike much of the competition, the new Genius can switch from 27.5" to 29" wheels with nothing more than the flip of a chip. No need to change the fork, all you need to do is flip a shock mount chip, change your wheels and off you go. The flip chip allows us to maintain a similar BB height when switching from one wheel size to the other which is key to keeping handling similar for both wheel sizes. With 27.5" wheels, you can run either 2.5", 2.6" or 2.8" tires. For the 29er, anywhere from 2.4"-2.6" is good to go. The Genius has always been a bike for everyone. Now, more so than ever this rings true. One frame, a multitude of options.