Roval Traverse 38 SL Fattie 27.5 148While there may be a linear relationship between increased tire size and increased fun, this relationship only holds true when wider tires are paired with the correct width rims. Having a 2. 8"; or high volume, tire mated to a narrow rim makes for a squirmy, poor handling experience, and when youre on the hunt for additional fun, these characteristics are undesirable. Lucky for you, the new age of traction, stability, and speed has arrivedand its name