both thresholds in bootstrap-responsive.css must be adjusted accordingly.
@media (max-width: 979px) {
...
}AND
@media (min-width: 980px) {
...
}- shooting for a collapse threshold of
1120px.
@media (max-width: 1120px) {
...
}AND
@media (min-width: 1121px) {
...
}I simply edited the contents of bootstrap-responsive.css, overwriting the contents in a separate *.css file is entirely possible.