If your old rvmrc is not ensuring a bundle then you can add this bit...

post_rvmrc.rb

#This bit goes at the end of rvmrc and makes sure that bundle is installed and it installs gems

#If you use bundler, this might be useful to you:
if [[ -s Gemfile ]] && {
  ! builtin command -v bundle >/dev/null ||
  builtin command -v bundle | grep $rvm_path/bin/bundle >/dev/null
}
then
  printf "%b" "The rubygem 'bundler' is not installed. Installing it now.\n"
  gem install bundler
fi
if [[ -s Gemfile ]] && builtin command -v bundle >/dev/null
then
  bundle install | grep -vE '^Using|Your bundle is complete'
fi