Rollbar Dimension Survey (or, Please Get Out Your Tape Measures and Yardsticks) - Miata Turbo Forum - Boost cars, acquire cats.

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Old 03-24-2011, 09:47 PM   #1
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Default Rollbar Dimension Survey (or, Please Get Out Your Tape Measures and Yardsticks)

I've been trying to figure out why my rollbar limits my seating position so much. I'm not a tall guy (5'10"), and I don't generally drive in a "laid-back" or severely reclined position. And yet I feel like I have to position my seat uncomfortably forward and upright to avoid putting my head on the rollbar.

I decided to see how my Kirk Racing bar compares to the more common Hard Dog and Bull Frog bars. I figure the most easily measured (and most pertinent) dimension would be the distance from the center of the windshield header to the top cross tube of the rollbar.

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The numbers are hard to read, but mine measures out just a bit over 22" using this admittedly-imprecise method. Call it 22 and a quarter inches. I measured it with the padding in place, not the tube itself.

Anyone who has a rollbar, I'd be very grateful if you are willing to take a tape measure and 5 minutes to measure as shown in my pics and report here with the distance, what brand and model rollbar you have, and whether you measured to the actual tube or to the outer layer of padding.
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Old 03-24-2011, 10:13 PM   #2
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I measure 24.5" from windshield header to tube in the 92 with the Hard Dog Hard Core and 25" in the 91 with Boss Frog Clear View.
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Old 03-24-2011, 10:23 PM   #3
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Old 03-24-2011, 10:29 PM   #4
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Damn. Why did Kirk Racing build this bar so far forward? I was under the impression they had basically copied the Hard Dog design.
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Old 03-24-2011, 10:39 PM   #5
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Why are some girls bigger than others?
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Old 03-24-2011, 10:42 PM   #6
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So, you think genetics, diet, and exercise are the reasons my rollbar is drastically different?
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Old 03-24-2011, 10:43 PM   #7
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Lolz.
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Old 03-24-2011, 10:46 PM   #8
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Those results are pretty conclusive already, but at this point I'm kind of curious if anyone's rollbar sits as far forward as mine does.
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Old 03-25-2011, 09:36 AM   #9
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I'll do mine at lunch, I actually have tape measure sitting in my passenger seat.
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Old 03-25-2011, 03:35 PM   #10
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I guess this leads to a second question -- has anyone removed one rollbar and then installed a different (especially from a different company) rollbar into the same car?

I'm assuming the mounting plates won't be same, and I'm wondering how swiss-cheesed the mounting areas will be once I drill a second set of holes. Not to mention the holes in the carpet that may not match, holes in the floorboard from the integrated door bars on this Kirk Racing bar, etc.
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Old 03-25-2011, 03:46 PM   #11
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I know that someone with a boss frog bought some of the door bars I was selling because he didn't realize they were only for the hard-dog bars and the holes weren't close.

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Old 03-25-2011, 04:13 PM   #12
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26" from windsheild to rollbar. 3.5" above top of seat.

NA HDHCHT
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Old 03-28-2011, 12:20 PM   #13
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Damn.

So...do I:

1. Yank the rollbar/door bars and sell them to some poor unsuspecting soul, buy HD/BF roll bar.
2. Yank the rollbar/door bars and sell them only to someone 5'6" or under.
3. Remove parts I want to keep and sell car with rollbar, start looking for a 94-95 or an NB.
4. Leave it as is and pursue foamectomy/race seat solutions to keep my head intact.
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Old 03-28-2011, 04:49 PM   #14
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While you will be outside with a measuring tape onto your rollbar.

I would have something to ask for the one you who drives a

HardDog HardCore HardTop X Diagonal for NA 1990-1997


I would appreciate alot if you might take some time to take more measure


Thanks alot






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Old 03-28-2011, 04:55 PM   #15
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thats a lot of mesaurements you want.


ill print and do it before i drive home. some of them will not be possible.
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Old 03-28-2011, 05:06 PM   #16
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I have cut a cage out of my car, and its getting a new one welded in. Going from a Hard Dog street cage to a custom built cage. You want to buy the old cage? At least the main hoop, then you can go forward with it.
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Old 03-28-2011, 05:13 PM   #17
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@brain : Thanks alot, the more measure I can have, the better it would be
I guess the hard ones will be "F" & "G"?

@Ryan : I am from Montreal, In Canada ...
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Old 03-28-2011, 05:21 PM   #18
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My reply was directed towards the OP.
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Old 03-28-2011, 05:28 PM   #19
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Ooops, Sorry
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Old 03-28-2011, 06:36 PM   #20
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best I could.

A 47"
B 35.5"
C 13"
D 12"
E 24"
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