Originally Posted by redlude97

you can probabaly get used to them, but bars are so cheap run what you like. I use 38cm on the road bike for aero purposes, 42cm dirt drops that flair to 50cm+ on the gravel bike, and 46cm bars of the cross bike. Make sure you account for the extra width in terms of reach. I like to measure at an angle from the tip of the saddle to the hoods to check effective reach between different setups

Originally Posted by Litespud

There's no "ideal" bar width, any more than there is an "ideal" shoe size. If you're comfortable with 42s, then use them, regardless of what some measurement says you "should" use. You can probably get used to anything, but why should you?