loading.html

<template name='loadingWrapper'>
  {{#if loading}}
    <i class="icon-refresh icon-spin"></i>
    Loading...
  {{else}}
    <div class="span9">
      {{renderPage}}
    </div>
    {{> sidebar }}
  {{/if}}
</template>

routing.coffee

Meteor.autorun ->
  loaded = -> Session.set 'loading', false
  Session.set 'loading', true
  switch Meteor.Router.page()
    when 'bikes'
      Meteor.subscribe 'bikes-count'
      Meteor.subscribe 'bikes', {}, Session.get('page'), loaded
    when 'showBike'
      Meteor.subscribe 'bike', Session.get('bikeId'), loaded
    when 'messageDialog'
      Meteor.subscribe 'messages', Session.get('userId'), loaded
    when 'userProfile'
      Meteor.subscribe 'user', Session.get('userId'), loaded
    when 'partsCatalog'
      Meteor.subscribe 'parts_catalog', loaded
    else loaded()