1999 TJ, 2/99 Build Date - Composite or Cast rotors? - Jeep Wrangler Forum

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Old 11-01-2007, 09:39 PM   #1
Join Date: Nov 2007
Location: Cumming, GA
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1999 TJ, 2/99 Build Date - Composite or Cast rotors?

Hey guys,

I just purchased a 1999 SE with severely warped front rotors. I bought a pair of composite rotors from Advance, only to find out that there may be 2 different styles for 99 Wranglers. So, I've done some research, called the dealer with my Vin # (they couldn't tell me anything useful) and come to a few conclusions:

The build date of my Jeep is 2/99. I think I've determined that it has full cast rotors.

I pulled out a composite rotor and a full cast rotor at Advance and compared them side-by-side. I can barely tell any difference that would affect performance. In fact, sitting on the counter at the parts store - the full cast rotor looks like a composite piece and the composite rotor looks fully cast.

The full cast rotor looks closest to what the Jeep has on it now. Does all this sound Kosher? I've heard that the 2 styles are completely incompatible. Also, I would really like to do this right the first time.

Thanks in advance,


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Old 11-01-2007, 10:37 PM   #2
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dont know what is a composite rotor.. i just know vented or solid if it fits get vented.. i never asked a question like that when i buy rotors for any car..

btw origional rotors for wranglers are composit

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Old 11-01-2007, 10:43 PM   #3

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Its been a while so if I am wrong sorry.... But as I recall the difference is in the height of the center section. I think its around 3/16" or something.. which means if you get the wrong one your jeep will not move.. no really it will not move. The composite rotors should look like different metals between the rotor and the center center where the studs go, as where the cast will look like the same.
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Old 11-02-2007, 09:09 AM   #4
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That's exactly what I measured - the cast's center section is slightly shorter. Sounds good, I feel better about it now.
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Old 11-05-2007, 05:49 PM   #5
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I go thru this same thing myself. I have 2 different sets of rotors in the garage at all times in case I need either or. If I remember right the switch happened sometime in August of 99.
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Old 11-06-2007, 02:29 PM   #6
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Forgot to update:
The cast rotors were the right fit for my 99. Thanks for the help!

So, for anyone searching this later on: There's a height difference in the hubs - shorter rotors are of the cast variety and the taller rotors are composite. Rather than determining the style based on looks alone, I would measure the heights of what's on the car vs. what they have at the parts store.

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Old 08-04-2015, 07:35 PM   #7
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Ah yea. I know that you need to match up the correct rotor to the correct hub. IIRC if you measure the height of the center of the hub it's either 1/2in or 3/4in. 1/2in is composite where 3/4in is cast. I was wondering if I can buy new wheel bearing/hub assembly that is 3/4in and buy cast rotors. Right now my 99 has the 1/2in hub which should mean I have composite rotors, but I suspect one of my wheel bearings is shot and the other is not far behind. I guess my question boils down to: Are the wheel bearing hub assemblies interchangeable? Can I buy the 3/4in hub and put it in my Jeep that has 1/2in hub?

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