Mountain bike handlebar diameters seem to be undergoing a slow motion evolution with 35mm bars becoming more common. Moving from 31.8mm to 35mm generally results in stiffer handlebars, but not everyone wants a stiffer bar. (Plus other factors play into bar stiffness including material choice, carbon layup, length, and shape.)
If you’re running 35s, tell us in the comments if you chose to swap out the bars on your bike or if they came stock on a new bike that you purchased.
