heavy85 Posted November 16, 2008 Share Posted November 16, 2008 Looking at SCCA / NASA rules and the rollbar can either be 1.625x0.120 or 1.75x0.095. Since the 1.75 tubing is lighter and more stiff I dont see any reason to go with the smaller 1.625 tube. Before I start ordering stuff is there anything I'm missing why you would want to use the smaller tube? Thanks Cameron Quote Link to comment Share on other sites More sharing options...
JMortensen Posted November 16, 2008 Share Posted November 16, 2008 What class? They changed the rules last year and I thought we were good to go with 1.5 x .095. It kinda pissed me off when I heard that because i had gone 1.75 x .120 just in case they made the rules STRICTER, and then they go and make them more lax. Quote Link to comment Share on other sites More sharing options...
JIM73240Z Posted November 16, 2008 Share Posted November 16, 2008 i went 1.75x.120 as well. oh well. its for safty right? thats what i keep telling myself. jimbo Quote Link to comment Share on other sites More sharing options...
johnc Posted November 16, 2008 Share Posted November 16, 2008 You can download the SCCA GCR free from their web site. The pertinent section is "9.4 Roll Cages for GT and Production Based Cars" and it starts on page 93. The minimum allowable tubing sizes (as of 2008) are: 0 to 1700 lbs (without driver) - 1.375" OD x .095" wall. 1701 - 2699 lbs (without driver) - 1.5" OD x .095" wall. 2700 lbs and up (without driver) - 1.75" OD x .095" wall. If the tubing used is .250" larger in OD then required, the wall thickness can be reduced to .080". Quote Link to comment Share on other sites More sharing options...
heavy85 Posted November 18, 2008 Author Share Posted November 18, 2008 I must have been looking at an old copy plus I had 1.625 instead of 1.5 stuck in my head. NASA looks to have somewhat recently changed as well: 1501 - 2500 lbs. (was 2200) 1.500” x 0.095” Chrome-moly / Seamless mild steel (DOM) 1.500” x 0.120” ERW* (No issuance of log books for cars with ERW cages 04/30/03) 2501 (was 2201) - 3000 lbs. 1.500” x 0.120” Chrome-moly / Seamless mild steel (DOM) 1.750” x 0.095” Chrome-moly / Seamless mild steel (DOM) 1.750” x 0.120” ERW* (No issuance of log books for cars with ERW cages 04/30/03) Looks like I will be going with 1.50x0.095" Thanks Cameron Quote Link to comment Share on other sites More sharing options...
heavy85 Posted December 13, 2008 Author Share Posted December 13, 2008 OK so doing some more research and found where I got the original data. The 2008 SCCA solo rules say: a) Over 1500 lbs.-min. of 1-1/” 2 o.d. x .120" wall or 1-3/4" o.d. x .095" wall Over 1000 lbs.-min. of 1-1/4" o.d. x .090" wall c) Under 1000 lbs.-min. of 1" o.d. x .060" wall I wonder if the solo rules are now superseded by the GCR?? I'm confused. Cameron Quote Link to comment Share on other sites More sharing options...
johnc Posted December 13, 2008 Share Posted December 13, 2008 The GCR is always ahead of the Solo rules regarding safety items. If you are building a roll cage, build it to the GCR rules. If you are building a roll bar (which the GCR does not address) build it to the Solo rules. Quote Link to comment Share on other sites More sharing options...
heavy85 Posted December 14, 2008 Author Share Posted December 14, 2008 I guess that means I'll need 1.75x0.095. Never thought of the rollbar vs rollcage but it makes sense that a bar would need thicker tubing than a cage would. Glad I didn't buy the tubing or bender yet .... Cameron Quote Link to comment Share on other sites More sharing options...
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