Front Rotor Size? - JeepForum.com
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post #1 of 27 Old 08-25-2005, 10:23 AM Thread Starter
DutchmanAZ
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Front Rotor Size?

I have a 99 TJ Sahara and need to replace the rotors. I called the local parts house and they say there are 2 different sizes: 3 3/16 inch and 3 1/16 inch .
I don't have my jeep here....does anyone know which size is considered standard or does it vary by individual jeep? I'm also assuming the measurements are for the size of the hub itself, not the rotor.
Any ideas? Thanks in advance

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post #2 of 27 Old 08-25-2005, 10:42 AM
Jerry Bransford
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It's the "hat" size that varies... from the top of the rotor surface to the top surface where the stud holes are drilled. Just take one or your rotors to the parts house and sit yours and theirs down flat on the counter top. Take the size that matches your rotor's overall height when they're sitting flat on the countertop.

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post #3 of 27 Old 08-25-2005, 10:46 AM Thread Starter
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Thanks Jerry. Much appreciated.
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post #4 of 27 Old 08-26-2005, 11:56 AM Thread Starter
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Thanks again Jerry!
Just a warning to everyone - I called several more parts houses this morning and was promised they had the correct rotor. After comparing them with mine, it was obvious they were not correct.
Be careful about what the parts monkeys tell you!
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post #5 of 27 Old 08-26-2005, 12:03 PM
Jerry Bransford
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I'm not sure if you have the taller or shorter "hat" but rather than just looking at rotors for the '99 which uses both sizes, have them pull out rotors for a '97/98 and a '00 and one of those two should be your TJ's size. Just an idea.

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post #6 of 27 Old 06-26-2007, 08:54 AM
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What about the rotor size on my TJ? Are there different sizes in my year?

*Edit*
Here's my old vs. what Advance Auto sold me:

Name:  100_1704.jpg
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post #7 of 27 Old 06-26-2007, 09:08 AM
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Quote:
Originally Posted by Jerry Bransford
It's the "hat" size that varies... from the top of the rotor surface to the top surface where the stud holes are drilled. Just take one or your rotors to the parts house and sit yours and theirs down flat on the counter top. Take the size that matches your rotor's overall height when they're sitting flat on the countertop.
That only works comparing full cast to full cast.

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post #8 of 27 Old 06-26-2007, 09:15 AM
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So what about mine? I thought the different sizes were different years compared to my 2001.

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post #9 of 27 Old 06-26-2007, 10:02 AM
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Quote:
Originally Posted by Conundrum
So what about mine? I thought the different sizes were different years compared to my 2001.
It's too hard to tell anything from your picture.

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post #10 of 27 Old 06-26-2007, 10:09 AM
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Well, I just put new rotors and pads on my Jeep Sunday night. After I was all done, the Jeep couldn't move. Look on the new rotor in that pic, it was rubbing on the bracket. I torqued the lug nuts on the passenger side to spec. Went ot check them again after torquing them just in case, they weren't tight enough. This happened three times before I tried to move the Jeep.

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post #11 of 27 Old 06-26-2007, 10:42 AM
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Quote:
Originally Posted by Conundrum
Well, I just put new rotors and pads on my Jeep Sunday night. After I was all done, the Jeep couldn't move. Look on the new rotor in that pic, it was rubbing on the bracket. I torqued the lug nuts on the passenger side to spec. Went ot check them again after torquing them just in case, they weren't tight enough. This happened three times before I tried to move the Jeep.
Sounds like you figured out the problem, although I still can't figure what question you are asking nor can I tell much from your picture.

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post #12 of 27 Old 06-26-2007, 10:50 AM
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I have a '99 and found out the hard way that the rotors were changed mid way through the '99 model year.. the sizes changed only slightly, but i had to buy rotors for a 2000 for them to work on my '99. I had them installed and was all proud and ready to go when i tried to drive forward and the jeep wouldn't move. Since this is my only vehicle and i was doing it during the work day when everyone else was at work - getting back to the parts store was a pain. It is worth either buying both sets and taking back the wrong ones, or take one in with you.

Overall, the process of replacing rotors and pads was much easier than i had anticipated and the money i saved doing it myself was well worth it - i just needed a BFH for the rotors.
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post #13 of 27 Old 06-26-2007, 11:16 AM
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Quote:
Originally Posted by Conundrum
Well, I just put new rotors and pads on my Jeep Sunday night. After I was all done, the Jeep couldn't move. Look on the new rotor in that pic, it was rubbing on the bracket. I torqued the lug nuts on the passenger side to spec. Went ot check them again after torquing them just in case, they weren't tight enough. This happened three times before I tried to move the Jeep.
Looks to long, I would say it rub.

I always remove my parts then go to parts store's that away you dont have to make 2-4 trips or get the wrong part.

Alot of them dumbazz down here that work at the part stores have no idea what the part even does! they have a computer and you give them the info, what happen to mechaniclly incline workers

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post #14 of 27 Old 06-26-2007, 11:54 AM
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Quote:
Originally Posted by iceman6533
i had the same thing happen, except i had another vehicle to use, but the rotors that fit my 99 are for a 2000, weird s**t
The rotor dimensions changed mid-'99 model year.

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post #15 of 27 Old 06-26-2007, 12:18 PM
Conundrum
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Then how come my '01 has a different size?

Matt
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