I\'m using Twitter Bootstrap 2.0.1 in a Rails 3.1.2 project, implemented with bootstrap-sass. I\'m loading both the bootstrap.css and the bootstrap-respon
bootstrap.css
bootstrap-respon
As of August 2013, a Bootstrap 3 "Customize and download" page can be found at http://getbootstrap.com/customize/
With Bootstrap 3, the relevant variable is @grid-float-breakpoint.
The following Stack Overflow page has additional details: Bootstrap 3 Navbar Collapse