Is nb5740 too big or too small?

Small.

Newbalance5740 shoe size is not big, one size smaller. New Balance 5740 is both retro/trendy/comfortable. Suede material makes this pair of shoes full of texture, and it is very calm with mesh and thick midsole.

The brand NewBalance founded by Mr. WilliamJ. Riley in Boston, the American marathon city, is called "the president's jogging shoes" and "the king of jogging shoes" in the United States and many countries.