rotor not lining up

[Apogee]

How are the camaro and firebird drum hubs different? If the bird hubs are shorter can I get away with spacers?

I'm pretty sure that the Pontiac hubs are wider than the Camaro hubs...hence the "WideTrack" marketing campaign. They certainly look that way in the pictures you posted. For reference, the Chevy drum hub measures ~2.415" from the face of the flange to the back lip where the oil seal installs measuring parallel to the axis of the hub.

I'm not a fan of spacers between the hub and rotor due to runnout issues that typically go with them, so KORE3 does not offer anything like that at this time.

Tobin
KORE3

[Ishmael]

So if Pontiac hubs are wider and I have determined my spindles are normal than why are my rotors running inboard? Additionally what's the difference between a shim and a spacer? Does anyone make spacers that will fit inside the hub?

[JRouche]

Additionally what's the difference between a shim and a spacer? Does anyone make spacers that will fit inside the hub?

Just to clarify. I didnt mean to shim the rotor or hub. I meant shimming the caliper to spindle. Thats a common practice.

Shims or spacers?? Its all the same. Basically its a thin piece of metal that is either ground for parallelism or a thin sheet of metal (can be soft metal or spring hard) that is measured for a correct thickness. Its a uniformed piece of metal that can be anywhere from .001" thickness up to what ever the supplier provides. If you need a thicker shim then a machined (ground) spacer covers that area. JR

[Ishmael]

What I need is a wheel spacer that will fit inside under the rotor hat. I know it isn't the best action but I can't figure out why the rotor won't line up since the spindle is the same as a camaro spindle at the boss and the hub is the same as a camaro hub according to what came from touring-classics. Is it possble that the spindle had been machined bringing the flange ( or whatever its called) where the hub is supposed to stop, back a little ways or that the bearings have been pressed in too far on both hubs? Does somebody have some spindles that could measure that distance for me? Or does someone know where I can find a spacer that is 5.9 inches in diameter and 3mm thick? Short of having some made, I can't find them anywhere.

[a67]

See the eBay link in this thread:

https://www.pro-touring.com/forum/sh...ad.php?t=68230

Appears that kit comes with shims for between the hub & rotor. Maybe contact the ebay seller for the thickness and if they may be purchased separately.

Bob.

[Ishmael]

thanks for the link,
Tobin I hope you are reading this cause I got some new numbers.
First, I've got spindles that look like camaro spindles but have the smaller boss bolts.
2. I can't get the seal on the back of the hub to within a 1/4" inch of the back of the spindle so maybe I have the wrong bearings in the wrong hubs - see number 3
3. Pontiac hubs are 2 5/8" and the Chevy hubs are 2 3/8" if you measure them like touring classics from the bottom of the hub to the face. My hubs are 6 cm which is 2.36 inches or 2 3/8" I imagine. If I chev hubs on a somehow pontiac spindle and the wrong bearings could it locate the hub in the wrong place? If I was able to move it over the problem would be worse.
4. The rotor is 18mm or 0.708 inches thick - not sure the conversion on that. The hat is 6mm or 0.236 inches thick. I ordered c4 rotors from my parts place. Is this the right thickness.
As the pirate with the ship's wheel sticking out of his pants said, "arrrg, this is is drivin' me nuts!"

[a67]

It sounds like the difference between the Chevy and Pontiac hub is 1/4".

At the same time it would move the rotor out further for too much of a misalignment in the other direction.

It sounds like these are the standard duty C4 rotors (12" x .80"). Note that the rear C4 rotors have slightly less offset. Using those instead of a front rotor will move the disc portion toward the outside of the car by about 1/8".

Don't know if you currently have front or rear rotors.

Since this was a kit, have you contacted the vendor?

Bob.

[Ishmael]

It wasn't a kit. I got the adapter from Touring classics. Then I got the rest of the parts from my local parts place. I've got front rotors. if the rears are the same size I might be able to make them work. What diameter are c4 rear rotors? Should I be worried that the hubs aren't closer to the spindle which would actually make the problem worse?

[LSx_88_Ciera]

What diameter are c4 rear rotors? Should I be worried that the hubs aren't closer to the spindle which would actually make the problem worse?

12"
I wouldn't worry.

[Ishmael]

Sounds like trying on the rears is a better option than using a spacer. I'd still like to figure out why it isn't working properly as is.

[LSx_88_Ciera]

Sounds like trying on the rears is a better option than using a spacer. I'd still like to figure out why it isn't working properly as is.

Aren't the fronts 13" if so the caliper won't line up right if you use a rear, the pad will hang over the edge of the rotor.

[Ishmael]

Aren't the fronts 13" if so the caliper won't line up right if you use a rear, the pad will hang over the edge of the rotor.

Ya, I'm getting tired and stupid.
I just reread Tobin's post about the chev drum hub. Mine are 2.36 if I measured right. 0.09" is 2.28mm which is close to the 3mm I'm out. I'll have to remeasure tomorrow but I'm pretty sure that's the right measurement. Where would those hubs have come from and why would they be on my car?

[a67]

It wasn't a kit. I got the adapter from Touring classics. Then I got the rest of the parts from my local parts place. I've got front rotors. if the rears are the same size I might be able to make them work. What diameter are c4 rear rotors? Should I be worried that the hubs aren't closer to the spindle which would actually make the problem worse?

OK, so doesn't Touring Classics state what remaining parts are required to work with their adapters? Geez, any body can sell parts, why don't they back them up??

C4 standard brake rotors, front & rear, are 12" x .80". Only difference is the offset.

Go back to the vendor of the adapters!!!!

When they are selling something, THEY HAVE TO SUPPORT IT!

If not, then they should be gone, out of business!!!!

How are we supposed to guess what their design goals are?!?!?!

Are they a supporting vendor of Pro-Touring?

Bob.

[LSx_88_Ciera]

C4 standard brake rotors, front & rear, are 12" x .80". Only difference is the offset.

Bob.

Depends on the year 84-94 Base 12/12, 95-96 13/12, ZR1 13/12

[gort69]

OK, so doesn't Touring Classics state what remaining parts are required to work with their adapters? Geez, any body can sell parts, why don't they back them up??

C4 standard brake rotors, front & rear, are 12" x .80". Only difference is the offset.

Go back to the vendor of the adapters!!!!

When they are selling something, THEY HAVE TO SUPPORT IT!

If not, then they should be gone, out of business!!!!

How are we supposed to guess what their design goals are?!?!?!

Are they a supporting vendor of Pro-Touring?

Bob.

Touring Classics is out of business. They were first rate top notch nice people.

They used to show a photo on their site that demonstated the difference between some of the Pontiac hubs and the Chevy hubs. Somewhere Scott has some mismatched parts that're screwing things up.

[Ishmael]

OK, so doesn't Touring Classics state what remaining parts are required to work with their adapters? Geez, any body can sell parts, why don't they back them up??

C4 standard brake rotors, front & rear, are 12" x .80". Only difference is the offset.

Go back to the vendor of the adapters!!!!

When they are selling something, THEY HAVE TO SUPPORT IT!

If not, then they should be gone, out of business!!!!

How are we supposed to guess what their design goals are?!?!?!

Are they a supporting vendor of Pro-Touring?

Bob.

They are out of business unfortunately. Noel was helpful but it took me a long time to get this together. Something in there is outside of our control. I have the right hubs per his instructions. Perhaps the brackets are too thick but I doubt it. My spindle is isn't the one with 5/8 bolt boss - its the 1/2" but it looks just like the other two. Perhaps that's it. I thought the fronts were 13 -they were supposed to be and I thought that's what I ordered. Are the 13's a different thickness than the 12's?

[gort69]

The C4 13" rotors are 1.10" thick.

[LSx_88_Ciera]

What happened to the pics you had posted?

[Ishmael]

I took them down because I wanted to put up more and had exceeded my limit. By the time I was ready to post up the new ones, someone had answered the question that was related to the new ones so it no longer made sense to post. What pic do you need? I'll even take new pics to try to get this mystery solved.

[LSx_88_Ciera]

One showing where the pads would contact the rotor face and how much clearance there is between the rotor diameter and the caliper.
I know this may sound stupid but I am wondering if you have an caliper bracket for a 12" rotor and a caliper for a 13" given the diff in thickness between the 12 and 13" rotors and the high amount of clearance you have.
I am reaching I know.