MSG C5

I had a few exhanges on different threads regarding Baer Eradispeed rotors, best pads to match up, etc., however after reviewing other threads and vendors offers, I am still confused on the various options.

My history - I purchased a set of used Baer Eradispeed rotors from a friend of mine who was trading in his Z06 back in 2005. They were the 13" two-piece front rotors and the 12" one-piece rear rotors. I matched them up with GM ceramic pads.

Since it's time for new pads, I'm considering upgrading the rotors again to a new set of Baer Eradispeeds. Per my research there are four options for the C5 Corvette; (1) Eradispeed which are 1-piece rotors for both the front and rear wheel in OEM sizes, (2) Eradispeed Plus which are 2-piece rotors for both the front and rear wheels in OEM sizes, (3) Eradispeed Plus One which are 1-piece rotors for both the front and rear wheels in larger than OEM sizes and includes hardware to relocate the OEM calipers and (4) Eradispeed Plus Two which are 2-piece rotors both the front and rear wheels in larger than OEM sizes and includes hardware to relocate the OEM calipers.

I think my confusion is that there are more options now than there were back in 2005. Since I'm running CCW wheels with a 3" lip in the rears, I know that Plus One and Plus Two sizes will require spacers or shaved calipers in order to fit.

My question is whether or not the Eradispeed Plus, 2-piece rear rotors will also require any type of modifcation to the wheels or calipers even if they are OEM size? Also, what is the benefit of 2-piece rotors vs. 1-piece? Are 2-piece rotors larger than the 1-piece rotors? I just wonder why my original set is 2-piece in the front and 1-piece in back. Note - I installed these when I had my original factory wheels and they fit. They also fit my Ace Slick and CCW wheels.



Thanks!

WKMCD

The 14 inch +2 2 piece rears come with an adapter block that bolts right up. You don't have to change anything.

I run them with my 19x13 CCW SP500's and also ran them with the 18x11.5 CCW Big Street Classics.

MSG C5

I have the 19"/11.5" CCW 505As in the rear. I think your 13" barrels/offset helped clear the calipers. Toque had to shave his calipers in order to make his 11.5" CCW SP500s fit over the calipers even with the adapter block. I'm not sure if the 505As fit that much differently than the SP500s.

Toque

My rear wheels are 11", and not 11.5". That may make a difference in clearance for you.

The 2 piece rotors are lighter in weight since the center is Aluminum.

Stock rotors are :
Front 12.75"
Rear 12"

My Eradispeed +2's are :
Front 13.35"
Rear 14"

I don't remember the exact weights on my bathroom scale, but the front Bear was 1lb lighter than the smaller stock rotor.
The rear rotors were the same weight (even though the Bear was 2" wider in diameter ).


Here is what I got:


Baer EradiSpeed-Plus-Two Brake Rotors Baer PN 2301053 - Front 13.35"






Baer EradiSpeed-Plus-Two Brake Rotors Baer PN 2302021 - Rear 14"

MSG C5

I would like to think that helps, but in looking at my current set up in the rear wheels, I have very little space in between the 12" rotor/caliper and the spokes of my 505As. I imagine by moving the rotor out towards the barrel another inch from center would cause it to hit.

Also, what is the major difference between 1-piece and 2-piece rotors? Lighter weight?

Toque

Yes I believe that to be true. It was when I compared the weight of the above rotors before I installed them.

TOque

MSG C5

Funny because back in 2005, I don't think there were as many options. Although I like the idea of the larger rotors in back, I'm not sure I want to add spacers or shave the calipers. As long as the 2-piece Plus rotors fit, that might be my first choice.

LS2NSUV

MSG and Toque,

I'm also seriously considering the Eradispeed 2 piece rotors, but now I'm not clear.

I thought I read on their site where the +2 option with the larger diameter rotors will fit the stock ZO6 18/17 set up. One just needs to use the retrofit brackets supplied with the rotors. You guys are running 19/18 and having to refab. Am I reading the site wrong?

Thx, mik

$$$frumnuttin'

mine will most likely be for sale in about 6 weeks, assuming the install of C6 calipers goes well. Here's one of the rears comparing the C6 rotor, which must be used with the new calipers due to interference.

LS2NSUV

Just found the other thread from Southern Car Parts. I think I'm clear now. CCWs dictate the refabing to the calipers. Stock wheel setup should be no prob. Correct?

JW Motorsports

It's best to measure to be 100% sure.

I have the templates loaded on my site. Scroll all the way down http://www.shop.jwmotoring.com/produ...categoryId=364

JW Motorsports

Baer says the fronts won't work behind the OEM wheels (not sure if that's base and/or z06). They do claim the rears fit. It's best to measure to be sure.

MSG C5

The challenge is that most CCW wheels have a 3" lip in the back and cause the face of the wheel (spokes) to have a different offset than the OEM wheels pushing the face closer to the calipers. Unless you are running OEM wheels, the published Baer Eradispeed fitment promise does not apply.

That's where all the confusion comes in as to which B.E. model will work with what wheel. As JWM points out, it's best to measure however since many of us have CCW or similar aftermarket wheels, I'm trying to compare notes to determine my options.

As long as the 2-piece rotors are the same width as the 1-piece rotors from a center hat perspective, not from a rotor diameter perspective, I think my choice is between the Eradispeed Plus (2-piece rotors with 12" in the back and 12.75" in the front) or the Eradispeed Plus 2 (2-piece rotors with 14" in the back and 13.35" in the front which will require either shaved calipers or wheel spacers in order for my 19"/11.5" rear CCW 505As wheels to fit around the rotors). The larger rotors in the front should not be a problem based on the smaller wheel lip.

MSG C5

Why are you moving to C6 capiers/rotors? Just curious.

Toque

I have the 13.35" front, and 14" rear. (both 2 piece)
Bear also makes a 12.75" front (2 piece). That would fit your stock 17" rotor fine (since 12.75" is the same size as stock)
I mounted my front stock 17" Z06 wheel with my 13.35" rotors and the caliper was WAY too close to the wheel for my liking.

I installed my stock Z06 wheels as a test on my rear 14" rotor setup and it works ok. I actually ran them for about 10 miles with my stock Z06 wheels (I had a flat last summer). There is about a 1/4" gap between the wheel and the caliper.

I have seen others on here running the 14" rears on stock Z06 wheels with no reported issues.

LS2NSUV

Quoting the Southern Car Parts thread: "All EradiSpeed rotors listed on our website will fit perfectly behind the stock wheels." And yes, they do list the 13.25" fronts.

What gives.

LS2NSUV

Thanks Toque.

Have you ever tried installing the stock front wheels with the 13.25" rotors?

MSG C5

Great comparison! I guess it's our love for the deep dish lips (CCW) that's the issue preventing a direct bolt on. Those larger 14" rotors in back look really good. They really fill in the space inside the barrels.

Toque

Yes, read my post again.
13.35 rotor was way too close for my 17 inch stock z06 wheel

Toque

c5vetteguy

I can't vouch for the Z06 wheels (as Toque already has) but the 13.35 rotors won't cut it on the stock 17" wagon wheels. I went with the stock size Eradispeeds (12.8") in front and 14" in the rear. Even though I run the 18x9.5" magnesiums all around, I could have gone with the larger fronts. I didn't because I still have my wagons as a backup set, and if I need to slap them on, I can.

I also added the DRM heavier brake proportioning spring to the master cylinder. It transfers a bit more bias to the rear so the car stops flatter, with little nose dive.