Some things for you all to consider:
I've used a 255 BFG Drag Radial on a 7" rim.
NoShoes has put a 275 BFG on a 7" rim.
Drag radials are not like regular street tires so you can squeeze them on a narrower rim.
As for the M/T's they grip a lot more from what I understand.
What kind of power levels are you guys running?
It is very easy to get too much tire back there.
If you start grabbing too much you are going to break something OR you are just going ot be carrying unnessecary weight down the track.
Tires are rotatioanl weight so that is even worse.
On a drag radial, you only want to do a big burnout the first time you are at the line for EACH day.
After that, a healthy dry hop to clean the tire of debris is all that is necessary.
This is one of my 2nd-gear burnouts on the 275 BFG Drag Radials:
http://www.jekylhyderacing.com/images/h ... y_2005.mpg
240/250, you will be fine with a 235 drag radial.
280/350, you might consider a 255 and 350-500 go for the 275s.
These are not hard-and-fast numbers, just a general guide based one what I have experienced and seen.
Anyone you know that is pushing 300 rwhp that plans on drag racing
(especially on drag radials) should consider getting the umpgraded CV joints from ATSRacing.com.
The OEM CVs are known to explode under hard launches above 280rwhp.
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