If u wanna know the ratios for the spreads, you should look at the daily Average True Rate (ATR) for both of the contract. For the bund and bobl, the ratio is 2 bobl for 1 bund. This means, the bund will move twice faster in comparison to the Bobl. You can create a chart for bund and bobl using this formula: Bar (DL*2-DB,1). If you wanna long in the spread, you long in the Bobl and you short in the Bund. And if you wanna short in the spread, you should short in the bobl, and long in the bund. In other words, you should long in the Bobl if you wanna long, and you should short in the Bobl if you wanna short in the spread. I'm an full time trader in a prop firm. A trainee actually. I've done some research on this field to improve my trading. If you wanna trade in a very short term period, i.e intraday, there is a different skill that you should consider if compared to seasonal. You may consider the butterfly spreading, which is a very complicated spreading, involving three market. For example, the Bund, Bobl and the Shutz. But then, if you're an intraday trader and you want to know more, you can e mail me. However, it's just an overview fr a trainee, not a very professional and experienced trader. Good luck with your spreading.