Group4 Wheels Usually 15" wide?

Robert,

The more common GP4/GT5 wheels are 13" wide and the less common ones you have are 14" wide. The measurement is actually taken from the inside of the bead lips.

Julian

quote:

Originally posted by Joules5:
Robert,

The more common GP4/GT5 wheels are 13" wide and the less common ones you have are 14" wide. The measurement is actually taken from the inside of the bead lips.

Julian

Thank you for the info. Obviously I didn't know that. I was going to say "you learn something new every day," but I seem to learn more than one new thing. I am not nearly as smart as I was when I was 18.

So, I guess he was telling the truth. I didn't know they came in two sizes. Well, see I have learned at least two new things today.

Hi Robert
If you are selling, I am interested to buy.

THOSE WHEELS AGAIN ...HER SIZE LOOKS MORE LIKE 29 25 34 .... LOL

Robert, Do you know what the backspace is on those ? (with straight edge across the inboard edge,the backspace is the distance to the surface that bolts up to the car.)

quote:

Originally posted by tecnosound-Jim Coyne:
Robert, Do you know what the backspace is on those ? (with straight edge across the inboard edge,the backspace is the distance to the surface that bolts up to the car.)

No, I will need to measure the backspacing. Not sure what they "inboard edge" is, but Google probably will. Heh. I should be able to take a pic of the measurement so you can see if I am doing it correctly.

Robert. Is that you in the white bikini? You look good.

Put the wheel face down on the ground. Put a stick, a 1 x2, a 2 x 4 on top of the wheel from edge to edge.

Now measure from the bottom of the 2x4 to the wheel mounting flange. That is the backspacing.

I wouldn't expect anyone who looks like that in a biki to know this anyway. I suppose I am a sexist?

Different manufacturers quote backspace in different ways, more often it is the mounting flange to the inside of the inner tire bead lip.

Less confusing would be to quote 'offset', the distance the mounting flange is offset from the centerline of the rim.

Julian

quote:

Originally posted by PanteraDoug:
Robert. Is that you in the white bikini? You look good.

I wouldn't expect anyone who looks like that in a biki to know this anyway. I suppose I am a sexist?

I have put on quite a few pounds of muscle since that photo was taken, but I still look good.

Yeah, that sounds sexist...but the truth is, when you look that good it is easier to get others to do silly stuff like measure "offset."

The wheels are in storage since my move, so I will try to run over there this weekend and measure. I will take a picture or two as well so it is obvious exactly what I am measuring.

I had a set of group 4 wheels on my Pantera and here are their measurements: front 10x15, backspacing of 4 5/8 inch and negative offset of 3/4 inch; rear 14x15, backspacing of 5 1/2 inch and negative offset of 2 1/32 inch. Hope this helps! Note: my wheels are now in Belgium, I did not feel like driving on the track with 35 year old rims at 185 mph!

If you are selling these wheels, I'm intrested in them even if 35 year old wheels could mean a risk as 74IMSA states.

actually, someone sent me a PM, offered to buy them as-is, needed them right away, threw some money in my PayPal account and they are gone.

I am really happy to have them be used rather than sit in a garage.