Rule book discrepancy: ROLL BAR

[Bobby Zlatkin]

If I'm reading the NHRA rule book correctly, there is a discrepancy on pg. #76, 4:10 Roll Bar.

In diagram, 4:10, it states, "All materials must be 1 3/4" O .D. mild steel ................except A, (rear braces that go into the trunk) which is 1 1/4" O.D.

In the paragraph just above the diagram, it states: "Rear braces must be of the same diameter ,,,,,,,,,
as the roll bar.

Which is it? Can I use 1 1/4" for the rear braces or do I have to use 1 3/4"?

[Dave Goob Cook]

Wow, I never noticed that, and it does need clarified.
Kits all come with 1 3/4" for all tubes.

Better check with your Division Tech director for a clarification....I'm going to do the same this weekend.

[55 Chevy]

That discrepancy has been in the rule book for a long time. I remember noticing that sort of thing and asking about it 15 years ago as it effected me at the time. I think it was all 1 3/4" if I remember right, but not positive.

[RPinoski1]

The cross bar that the seat bolts to is the "A" bar. Not the rear bars. Hope this helps.
Rich

[John Mason]

Rich is correct. In older rule books using this picture there was an arrow from the "A" to the cross bar that has been deleted somewhere but the intent remains the same - all parts of the roll bar must be the same size EXCEPT the cross bar.

[goinbroke2]

Here's a question, does the hoop have to be a single piece? What I mean is, I have a bunch of 8ft pieces of 1.75 tube. I am building the roll bar and 8ft is not long enough to go from floor up over and back down to floor. Can I use two pieces of tube and run a joint or splice tube inside? (not a class car but could relate)
I need a piece approx 10 1/2ft long to do it in one piece.