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Hi
First of all, are you looking for a race certified rollcage for such clubs like the SCCA? There are certified bolt-in rollcages on the market but they are rare. I don't know why, because on a structural point of view, if well designed they sould be as strength as welded rollcages. The thing is in structural engineering (like bridge building), designers are prone to use bolt assemblies instead of welding the whole thing together. I study mechanical engineering and have a teacher telling us this almost every course!! Welded structures are good but all resides in strong welds, and thats where it gets complicated. Bolted stuff is all standardised, welds are also but you need to get a certified welder, someone who can weld up to the standard needed and that costs a lot! It is also easier to predict what happens in a bolted assembly rather than welded (mostly because of the quality of the welds) If you find a certified bolt-in roll cage you only need to assemble it and respect the manufacturers instructions like required torque in bolts. It's easier and cheaper than certifying a welded rollcage. If it's only for looks, it's up to you!
Frank
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