Most of the mag wheels are relatively narrow because they are meant for road tires anyway. Wider tires may look good, but they add rolling resistance and slow you down. That is one of 2 reasons I wanted to use a 700c bike/wheel on my build. I am not going off road. They are narrower by default and much better suited to running higher pressures to support my weight and go down the road. Much more stable at speed too. I actually quite like my 40mm width tires, they are a great compromise. A bit more meat than the standard 23, but not quite mountain bike.