Not sure what you mean by beefier look or by improved performance. At 2.6" taller than stock, The 235 tire would be a detriment to performance (not to mention possible clearance issues).........increasing tire diameter places more load on the engine/drivetrain. For example, is it easier to pedal a 10 speed bike in 1st gear or 5th gear? Increasing the tire width by 1.18" (205mm vs 235mm, depending on the rim) could be considered beefier, I guess. Raising the center of gravity is a whole other issue.