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Unread 01-01-2008, 07:44 PM   #1
Barroom Hero
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Stock rotor thickness

Does anyone know the stock rotor thickness on a 2001 TJ? Changed my pads and rotors today and the rotors are too thick, which end up not letting the wheels turn once their bolted on. Got my rotors from NAPA, going back tomorrow, but I would like to know what to look for.

Thanks,
Keith

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Unread 01-01-2008, 08:09 PM   #2
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They changed how deep the rotors are in like 2002 or so IIRC. You need the earlier kind where the hat should measure 2-1/8", you got the ones that are 2-1/4". I ran into the same thing today at work on a Cherokee.
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Unread 01-01-2008, 09:00 PM   #3
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Thanks, amazing the difference 1/8" makes. Looks like I'll be bringing my ruler to NAPA tomorrow.
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Unread 01-01-2008, 09:02 PM   #4
Jerry Bransford
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Quote:
Originally Posted by Barroom Hero
Thanks, amazing the difference 1/8" makes. Looks like I'll be bringing my ruler to NAPA tomorrow.
Better yet, take in one of your old rotors to make sure the new rotor's dimensions match.
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Unread 01-01-2008, 09:05 PM   #5
Nonya
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there are two different rotors,2.75 inch and 3 inch.Ask me how i know?I ran into the same thing you did.If your jeep came with composite rotors you need 3 inch.
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Unread 01-01-2008, 09:24 PM   #6
Barroom Hero
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Not sure what kind mine came with, any way to tell? I would take the rotors with me to the store, but I had to put them back on so I could drive the car.
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Unread 01-01-2008, 09:28 PM   #7
Nonya
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Just measure the total thickness from outside to outside.Lay it flat on a surface and lay a straight edge across the lug flange then measure down to the surface.
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Unread 01-01-2008, 09:35 PM   #8
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Thanks, will do
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Unread 01-01-2008, 09:49 PM   #9
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Quote:
Originally Posted by Nonya
Just measure the total thickness from outside to outside.Lay it flat on a surface and lay a straight edge across the lug flange then measure down to the surface.
That won't work at a general rule if one rotor is composite and the other is full cast and both were made for the same years.

The important dimension is from the inside of the rotor hat to the inboard face of the rotor as it's mounted on the unitbearing.

The way you are having them measure will not take into account the difference in thickness of the cast versus drawn steel rotor hats.

In other words, you could wind up with a late composite and an early full cast and be nearly the same overall height.
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Unread 01-01-2008, 09:55 PM   #10
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So in summation in need a shorter hat, correct?
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Unread 01-01-2008, 10:11 PM   #11
Nonya
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when i went to buy rotors they had two different ones....2.75 thick and 3.00.I needed the 3 inch,just measure them like i said...actually just get the other ones...you already tried the wrong ones
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Unread 01-01-2008, 10:17 PM   #12
Barroom Hero
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Quote:
Originally Posted by Nonya
when i went to buy rotors they had two different ones....2.75 thick and 3.00.I needed the 3 inch,just measure them like i said...actually just get the other ones...you already tried the wrong ones
Good point
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