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Old 08-08-2019, 11:38 PM   #1
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Are the roll hoops functional as a roll bar?

Or are they merely decorative? They look like “style bars” on the Miata which are not meant to protect driver and passenger.

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Old 08-09-2019, 12:18 AM   #2
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They're a safety feature.
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Old 08-09-2019, 07:15 AM   #3
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Definitely functional. It is a properly-reinforced steel bar that attaches to the frame of the vehicle. Part # 986 580 011 01(roll-over bar), page 323 of the parts catalog.
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Old 08-09-2019, 07:53 AM   #4
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According to PCA they are good enough for the track, so I'd say yes.
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Old 08-09-2019, 08:38 AM   #5
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They are quite beefy
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Old 08-10-2019, 05:35 PM   #6
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They are PCA track certified, and from what I have heard they are certified with most track events.
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Old 08-14-2019, 05:30 PM   #7
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Unless you are too tall in the seat to pass the broomstick test, then you need a roll bar extension.i
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Old 02-25-2020, 06:25 AM   #8
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some tracks require the Brey Krause Roll Bar Extension regardless of driver height, like the track near me (Virginia Int'l Raceway); but most will let you drive as long as the top of the helmet is below the top of the roll-bar.
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Old 02-27-2020, 07:50 PM   #9
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Ha, ha ... shame on you for thinking Porsche would install "cosmetic" bars.
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Old 02-27-2020, 07:52 PM   #10
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Ha, ha ... shame on you for thinking Porsche would install "cosmetic" bars.
The fact that anyone would think that just gives credit to how cool they look, though!
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Old 02-28-2020, 08:56 AM   #11
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I'm curious as to how integral they are to the structural rigidity. Could I go without them for 3-6 months (street) while doing some interior work?
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Old 02-28-2020, 11:17 AM   #12
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some tracks require the Brey Krause Roll Bar Extension regardless of driver height, like the track near me (Virginia Int'l Raceway); but most will let you drive as long as the top of the helmet is below the top of the roll-bar.
2 in mim distance between the top of the helmet to the top of the roll bar. Hence extensions.Belts stretch.
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Old 03-01-2020, 06:13 AM   #13
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I'm curious as to how integral they are to the structural rigidity. Could I go without them for 3-6 months (street) while doing some interior work?
I'm not an engineer nor do I play one, but my guess based on steved0x photo is they aren't important for structural rigidity
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Old 03-01-2020, 06:57 AM   #14
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I'm curious as to how integral they are to the structural rigidity. Could I go without them for 3-6 months (street) while doing some interior work?
They're critical. It's effectively your B-pillar. Convertibles require reinforcements there (and in the front, around the windshield) since they do not have the hard-top roof providing rigidity.
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Old 03-01-2020, 08:23 AM   #15
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just to play devil's advocate (and because I really don't know) can you explain the load paths that make it critical for structural integrity. I can understand a small contribution to torsional rigidity but nothing longitudinal.
as an extreme example, this 914 still has the roll hoop intact but is obviously dead


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Old 03-01-2020, 02:13 PM   #16
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Rear side impact protection perhaps.....but really the whole structures behaviour needs to be considered
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Old 03-01-2020, 02:29 PM   #17
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Hasbro, I think you're perfectly fine driving for a while without it.
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Old 03-03-2020, 05:03 PM   #18
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Hmmm, thanks all. I'll give it a try for a week or so and put it back on. It will eventually be replaced with a custom set up.

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