Editing NHRA-legal roll bar (section)
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====Roll bar padding==== <blockquote> ''"Roll bar must be padded anywhere drivers helmet may contact it while in driving position. Adequate padding must have minimum 1/4-inch compression or meet S.F.I. Spec 45.1. All cars running 180-mph or faster, S.F.I. Spec 45.1 mandatory."'' </blockquote> Whether you think so or not, seat and shoulder belts stretch when you're flippin' and rollin', so make sure you've covered all your bases here with every possible place your helmet could make contact with the bars. There is no restriction on improving a rollbar into a rollcage, even though you must use 1 3/4" minimum diameter tubing for a rollbar and can use smaller 1 5/8" for the rollcage. Just build onto the existing rollbar material with your new 1 5/8" tubing. Also, there is no restriction on using 1 3/4" material for the entire rollcage. There is just a 1 5/8" minimum for a rollcage and 1 3/4" minimum for a rollbar. You could even use larger material if you want to, you just can't use smaller than the rules call for. Of course, there has been much hoopla about the choice between mild steel and chromoly. Mild steel is less expensive than chromoly and can be migged or tigged in. Chromoly is more expensive to buy and must be tigged in. A car with a moly bar or cage may be easier to sell. This article was written pursuant to the 2008 NHRA Rulebook and will be updated in the future.
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