Deleting Part of a Peg?

I have created a walking cycle that is 60 frms long. I want to turn it into a loop — BUT I created this cycle on Pegs that I had previously set to 360 frms, therefore I’d like to delete the part of the set peg i’m not using. – Only problem is it compresses all effects on the peg, instead of leaving them as is.

Help!
Thanks