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What Rotors
- Thread starter XJTJYJ
- Start date
RichP
NAXJA Forum User
- Location
- Effort, Pa
IMO the cast are the way to go, the composites seem to warp easier which is what the factory puts on. I had the recall done about 2 years ago where they put on new rotors to replace defective composite, they replaced them with newer composites. I just noticed lately that they have a bit of a warp to them [pulsating pedal even at low speed] and I have a set of wagners sitting on the shelf that I had cryogenically treated [frozen to -400F] a few years ago and never got to use, next warm day the rotors get changed and new pads put in.
natep1
NAXJA Forum User
- Location
- Rochester, MI
Cast rotors will have an overall height of 3 1/16"
Composites are 3 3/16"
HTH
Composites are 3 3/16"
HTH
natep1
NAXJA Forum User
- Location
- Rochester, MI
Bottom to top while it is laying down flat.
As for measuring, I have never tried to measure them on the vehicle, looks like a PIA though.
Good luck.
As for measuring, I have never tried to measure them on the vehicle, looks like a PIA though.
Good luck.
natep1 said:
It's also worth noting that they aren't interchangeable - if you get the wrong size, it'll foul the backing plate. I ran into this on my '01; had I been smart I would've bought both sets and returned the ones I didn't use - the 90-minute job turned into a full-day exercise in trying to locate the right set.
Urban Redneck
NAXJA Forum User
- Location
- Arlington Heights, IL
I did not mean that your advice is a PITA. It is priceless. I did not mean any disrespect. I woas looking for a magic shortcut so I will have more time tomarrow to get drunk and stare at the overgrown grass.
That is a sweet site! I would like to tube out my XJ but the ball and chain would complaint during winter months and when iI get it up on its rear like that, the Groceries would fall out.
That is a sweet site! I would like to tube out my XJ but the ball and chain would complaint during winter months and when iI get it up on its rear like that, the Groceries would fall out.
- Location
- Terra Firma
Confirm that they have different dimensions, so it isn't a question of buy the one you want, as RichP suggested. However, I was under the impression that 1999 was the year they made the change (mid-year, mid-production change), and that all 2000s were cast rotors.
Should be easy to check the overall depth on the vehicle. Jack up one wheel, remove tire, lay straightedge across wheel mating surface of rotor, hoof tape measure tip beind rotor ==> read tape.
Should be easy to check the overall depth on the vehicle. Jack up one wheel, remove tire, lay straightedge across wheel mating surface of rotor, hoof tape measure tip beind rotor ==> read tape.
Matthew Currie
NAXJA Member #760
- Location
- Vermont, land of big clay
You can tell which kind you have by looking at them. Think of the rotor as a hat. Look at the hat sideways. On the Cast, the top edge of the hat is a sharp corner, and on the composite it is slightly rounded.
RichP
NAXJA Forum User
- Location
- Effort, Pa
Eagle said:
I'm gonna be royally pissed if those rotors I bought back in 99 or 00, had cryo'd and have had on the shelf since then are the wrong ones I can tell you that.
:rattle: If it stops raining today I guess it will be a good time to jackstand the rig and rotate the tires, then I can check.I still think that you can or should be able to get either cast or composite, I may be wrong, we'll see. My only saving grace was that when I bought them they only listed one cast and one composite.
- Location
- Terra Firma
While I was hibernating in Chile over the winter, I did as much research as I could on this topic. The following is what I came up with. Please note that it is copyrighted, and I am NOT granting permission for this to be copied or reposted anywhere else.
Which means that RichP can use the cast rotors, but will probably have to change the hub/bearing units when installing them.
Which means that RichP can use the cast rotors, but will probably have to change the hub/bearing units when installing them.
RichP
NAXJA Forum User
- Location
- Effort, Pa
YEABUT, thats factory parts. I'm taking a leap here but it could also be that the aftermarket manufacturers produced cast rotors to replace OEM composite one's with. When my son did his 97TJ last summer his rotors were composite OEM and the wagners I picked up at the parts store were cast, they went right on. I could have sworn the part numbers for the 97TJ were the same as the 98XJ...
