About rails version

Hello all.

I'm planning to use the ruby 1.8.5.
And I was wondering which version of rails should I use.

In the official web site it seems that rails still supports v 1.8.5

  We recommend Ruby 1.8.7 for use with Rails. Ruby 1.8.6, 1.8.5, 1.8.4
and 1.8.2 are still usable too, but version 1.8.3 is not.

  Source: Compile it yourself
  Windows installer: Ruby, popular extensions, editor
  OS X 10.4: Ships with broken Ruby, follow this guide
  OS X 10.5: Included with developer tools
  (then do "gem update rails")

However, it does not describe which version of rails fits to v 1.8.5.

Could someone educate me which version of gems and rails
fits to ruby v 1.8.5?

Best Regards,
Yu Watanabe