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Old 07-17-2008, 05:16 PM
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Default Wilwood aluminum rotor hat

I have Wilwood front rotors but I am concerned with the thickness of the hat. I will be running aluminum wheels so the hat is thicker as well as the mounting surface of the wheel. I have stock length studs. The hat + wheel mounting flange = 7/8”, not including the conical seat. I have not measured how much stud protrudes. The Wilwood rotors are stock size, I was surprised how there seems to be little weight difference, maybe the difference is more than I think as I did not use a scale. Currently I am using stock rotors.
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Old 07-17-2008, 05:23 PM
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Install some longer 1/2" studs, the stock 7/16 are pretty weak. What hat & rotors do you have? Do you, or anyone else, know the hat offsets for front & rear?
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Old 07-17-2008, 05:52 PM
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C3 Rotor Dimensions
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File Type: jpg C3 Rotor copy.jpg (28.4 KB, 28 views)
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Old 07-17-2008, 06:27 PM
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The rotors are the same ones this guy sells…. [Only registered and activated users can see links. Click Here To Register...]

I would like ½” studs, but is it really necessary on the street with street tires?

Last edited by 68L71; 08-27-2008 at 02:17 PM..
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Old 07-17-2008, 06:51 PM
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Larry, is that front or rear? they are different in offset too.
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Old 07-17-2008, 07:33 PM
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Quote:
Originally Posted by Twin_Turbo View Post
Larry, is that front or rear? they are different in offset too.

Good question. It's what I had here at work. I'll check when I get home.

I can't imagine that the Wilwood hats are thicker than the stockers. C3 roteors seem thicker there than any I have ever seen. 68L71, you should have at least 1.25 stud length (beyond the hub face).
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Old 07-17-2008, 07:47 PM
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Stock = 1/4"
Wilwood = 1/2"

With steel wheels the wheel is thin but aluminum wheels have thicker mount flange. The only reason I am concerned is I would be using both thicker hats and wheels. If I upgraded to longer ½” studs it would solve the problem, but if I don’t need too, I do not want to go to the trouble of adding ½” studs. I need to measure how much stud protrudes but I need to pull the caliper to test fit.
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Old 07-17-2008, 08:11 PM
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Quote:
Originally Posted by 68L71 View Post
Stock = 1/4"
Wilwood = 1/2"

With steel wheels the wheel is thin but aluminum wheels have thicker mount flange. The only reason I am concerned is I would be using both thicker hats and wheels. If I upgraded to longer ½” studs it would solve the problem, but if I don’t need too, I do not want to go to the trouble of adding ½” studs. I need to measure how much stud protrudes but I need to pull the caliper to test fit.

Stock should be at least 3/8". 1/2" hub face thickness for an alumunum hat is thick.
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Old 07-17-2008, 08:57 PM
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Quote:
Originally Posted by BBShark View Post
Stock should be at least 3/8". 1/2" hub face thickness for an alumunum hat is thick.
That was a factory rear rotor I measured.
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Old 07-24-2008, 12:19 AM
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I`m using this one on the front...HD series fixed mount. please note, they measure offset kinda funny...you can (I think) get longer 7/16 studs, I don`t think I would use a 7/16 stud in a hat with a 1/2" hole...redvetracr

8 x 7.62" rotor circle

5 x 4.75" bolt pattern


1.50" offset


.51" stud hole

2.85" center hole

.50" face thickness

6.51"

.323"

Wilwood #170-0176
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