When do Bonds/Notes Roll?

[Mike Marcott <omegalist@xxxxxxxxxxx>]

Hello List,

When do the Bonds/Notes (US, TY, FV, TU)  roll to the next contract?  Is 
it a set date or is it based on volume?  Where would I find info on this?

S&P contract rolls on the Thursday the week prior to expiration - do the 
bonds/notes do the same?

Any info would be greatly appreciated.  Thank you.
--
Best Regards,

Mike