There are some unique attributes to Globex exchange supported intercommodity spreads (different products, like Fives vs Tens or a Crude Oil Crack); specifically, the way in which these intercommodity spreads are quoted and filled. This is different beast than, let's say, an intracommodity spread (same product different expiries) like a Dec17-Mar18 1:1 Crude Oil Calendar Spread or a Dec17-Dec18-Dec19 Eurodollar 1:2:1 Butterfly.
https://www.cmegroup.com/confluence/display/EPICSANDBOX/Implied+Intercommodity+Ratio+Spreads
For the CBOT Treasuries, the exchange intercommodity spreads are quoted as net change from the previous trading session's settlement. This is quite unique in the world of electronic exchange supported spreads. As a side, this was also the methodology used by floor brokers and their desk clerks to quote Treasury Spread pricing in the days of open outcry pit trading.
Here's a Daily Chart of the Fives versus Tens (FIT) where you can see how the net change rolls from session to session:
Here is a synthetic spread chart using the correct exchange supplied ratios for Dec 17. This is important to track and model because these spreads indeed trend and have usually have their own unique price action:
Here is the official CBOT Implied Treasury Pricing Sheet for the Dec 17 contracts. You can use it to create synthetic spread charts:
Notice how during this time period the Five Year Notes rallied and then sold off:
And during the exact same time period, the Fives versus Tens Ratio'ed Spread more or less continued a gradual sell-off in a narrow channel no more than a few tics wide in terms of daily trading ranges:
https://www.cmegroup.com/confluence/display/EPICSANDBOX/Implied+Intercommodity+Ratio+Spreads
For the CBOT Treasuries, the exchange intercommodity spreads are quoted as net change from the previous trading session's settlement. This is quite unique in the world of electronic exchange supported spreads. As a side, this was also the methodology used by floor brokers and their desk clerks to quote Treasury Spread pricing in the days of open outcry pit trading.
Here's a Daily Chart of the Fives versus Tens (FIT) where you can see how the net change rolls from session to session:
Here is a synthetic spread chart using the correct exchange supplied ratios for Dec 17. This is important to track and model because these spreads indeed trend and have usually have their own unique price action:
Here is the official CBOT Implied Treasury Pricing Sheet for the Dec 17 contracts. You can use it to create synthetic spread charts:
Notice how during this time period the Five Year Notes rallied and then sold off:
And during the exact same time period, the Fives versus Tens Ratio'ed Spread more or less continued a gradual sell-off in a narrow channel no more than a few tics wide in terms of daily trading ranges: