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    frame wall thickness
    #1
    Member 1993KA24DET's Avatar
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    Im going for extreme lite wieght but keeping it ridged. Im coping the Rage Motorsports R180RT Buggy. 1.5 tube, but should i use .095, .083 or .065
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    Re: frame wall thickness
    #2
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    From the SCORE rule book

    Minimum tubing size for the roll cage is:
    Up to 2000 lbs. - 1.500" x 0.095" CDN/4130/Seamless or ASTM 1018/1026 CDS/DOM
    2001 - 2500 lbs. - 1.500" x 0.120" CDN/4130/Seamless or ASTM 1018/1026 CDS/DOM
    2501 - 3000 lbs. - 1.750" x 0.095" CDN/4130/Seamless or ASTM 1018/1026 CDS/DOM
    3001 - 4000 lbs. - 1.750" x .120" CDN/4130/Seamless or ASTM 1018/1026 CDS/DOM
    Over 4000 lbs. - 2.000" x 0.120" CDN/4130/Seamless or ASTM 1018/1026 CDS/DOM
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    Re: frame wall thickness
    #3
    Member 1993KA24DET's Avatar
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    the buggy is going to weigh in at 820lbs
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    Re: frame wall thickness
    #4
    Super Moderator TutTech's Avatar
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    What material you thinking of using?
    Chromoly you can go .065 on that light of weight and that tube size easy enough.. ask K-fab his .065 car took a major hit to the nose and nothing wrong he said at all.
    Going .065 will also make your buggy weigh less too.

    On DOM you may want to go .083 but also you can probably use the .065.
    For safety I would go the .083 if you can find and get it for a decent price etc.
    The .065 DOM is softer and will bend and dent etc. if hit or maybe in a major roll or damage if landing on a rock etc. as it is not as hard as the chromoly so I would build it in chromoly for that thin.
    But either way you will not need .095 if you are really that light.
    Hard to say how much you will weigh no? Just changing your tubing thickness can alter a cars weight etc.
    Also going 1.5 tubing helps and so going .065 may not be to bad.

    Think of where your driving it and the abuse your going to do to it also. Jumping, desert racing, hitting rocks etc. you want thicker to make your frame last longer. If you go to thin it will start to crack etc. and fail sooner.

    On my Mini Desert Lite because of racing and the rules Cup Cake posted I had to go .095 on just the main frame rails and then .120 for shock mounts and arms then .065 on all the webbing and any inner bars that are for just support. Saves weight and those bars are not as likely to get hit or damaged so don't need to be as thick.
    They are just triangulation, like cables holding a bridge in place to help suport the load etc.

    Cool good luck and keep us posted on what you do.
    Also welcome to the site and thanks for serving in the military very cool.


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    Re: frame wall thickness
    #5
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    Here's a link to weights:

    Weight of Round and Square Steel Tubing

    You can do the math if you know how many feet of tubing you will be using and decide if the lighter weight is worth it.
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    Re: frame wall thickness
    #6
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    I like mixing the best. Properly designed, you won't have the cage collapse with the .065. However, it dents much more easily. I like .083-.095 for lower frame rails and bumper if intergrated (so rocks ect. don't dent the frame). Also for the verticals directly behind the drivers head. Then usually .065 for most everything else.
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