You don't have too. It's actually recommended from actual racers that tubes can make things worse. These racers say they tend to wobble more at 100+MPH. I have used both and I actually liked the way the tubes felt. When I drove DrDCanaceu's car I had no issues. I ran an 11.2 @122MPH w/ a 1.67 60'. You will get different opinions. Try them w/o and if you feel it unpredictible try the tubes if you like. I am switching back and forth when I get my car back up again to see what it does, but I will be going w/ drag slicks no more ET Streets.