I'm getting ready to purchase a set of rear drag radials and need help on choosing the size I did. I currently have 18"x10" DD Bullets on the rear with 275/40-18 tires. What is the biggest DR I can fit on these rims and on my car. The rear is lowered around 1" with the Roush lowering springs. Pics would be great in helping me decide. I use the car as a show and go car so I need to mount them on my current rims, swapping rim size is not an option.