It depends on the chain you have installed on the chainsaw. You can look at the numbers stamped on the drive link side of the cutting chain and it should have a 2 digit number that correlates to the size.
The factory chain supplied with the #455 rancher was a .325" pitch 3/8" chain.
Here's a link to the specs for your saw with some useful info
http://www.husqvarna.com/us/homeowner/products/sawing/chainsaws/455-rancher/#specifications
Hope you found this very helpful and best regards!
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