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Old 11-26-2012, 06:58 PM   #1
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6 Piston Cts-V2 Front Brembo Gto Bolt On Bracket

These are available now at bohnman customs! www.bohnmancustoms.com





Hey guys, I've been wanting to create a bracket to fit v2 calipers onto a gto for some time now and finally got around to doing so. If you have seen any of my other bracket threads (http://www.ls1gto.com/forums/showthr...53#post8747353 & http://www.ls1gto.com/forums/showthr...821&highlight= ) you'll notice that I have a set set of requirements & will make them happen if they are not available to me. Same goes for this.

Evenso that the CTSV2 front rotors are 370mm (14.56") and originally ride on vehicle equipped with 19"+ wheels I've been wanting to fit a cts-v caliper in an 18" wheel. I figured out that the gen 5 Camaro SS/Pontiac G8 GXP rotors should do the job, they were smaller in diameter (355mm - 14") and utilize the oem brembo 32mm grasp thickness since they come from a car equipped with them from the factory already, also the 5x120 bolt pattern is retained as well, so it was pretty much a win in almost every category for me. The challenges to be dealt with were the Hub diameter & wheel stud differences between the gto & GXP/SS rotors.
The G8/SS rotors have a smaller hub diameter/circle on them than the gto; the gto seems to be a unique case as most cars aside from larger saloons/sedans or even trucks only trump it in hub diameter clearance.

Being as the gto hub clearance is 71.4mm and the GXP/SS is 67.4mm, I had to do some work to open it up to gto specs, which can be even done with regular demurring bit attachments or fanciers ways via a lathe. After the clearance was dealt with, the wheel stud holes were adressed.

As you can see the G8/SS have larger wheel stud bolt holes, this is due to them using an m14 stud opposed to the Gto m12 studs. I didn't like the looser fit of the rotor around the studs so I went ahead and designed small sleeves that slip/press into the G8/SS stud clearance holes. These sleeves replicate the gto stud clearance and sit below the rotor surface in order to not cause any clearance issues. They make the rotor feel as if it was meant to be on there in the first place.

The bracket is pretty much bolt on, with no compromise at all, the calipers go on without issue over the rotor/bracket setup. I even test fitted an oem gto 18" wheel and it cleared, minimal clearance but it clears. And those 6 Piston V2 Brembos do look menacing behind the stock wheels!
I do not wanna blow my own horn but I think I really did outdo myself on this one, I knew wheel clearance with the stock +48 offset 18's would be tight or even close where I would have to use a spacer but it all bolts in!
Rotor clearance is held with oem spec as well:


Bolted in pre wheel test:

Spinning free (bolted in pre wheel test):

Spacer in pics cause lugs were too short lol.

The GM part #'s for the 6 Piston CTS-v2 Brembo Calipers are 25912967 & 25912477

They can be had thru many retailers, in ranges of 700-900$ per set, amazon for example has them roughly 340$ a piece:

Amazon Amazon
Amazon Amazon

GM# 25912477 (AC Delco# 172-2487) - Silver 6 Piston Front Brembo Caliper LH
GM# 25912967 (AC Delco# 172-2488) - Silver 6 Piston Front Brembo Caliper RH
GM# 20982719 (ACDelco #172-2521) - Yellow 6 Piston Front Brembo Caliper LH
GM #20982734 (ACDelco #172-2522) -Yellow 6 Piston Front Brembo Caliper RH

Remanufactured CARDONE 18-5200 & 18-5201 units can be had for 160-200$ each.
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My 4 Piston Front Brembo 340mm Setup http://www.ls1gto.com/forums/showthr...821&highlight=
My stock 17 4 Piston Brembo Setup http://www.ls1gto.com/forums/showthr...448&highlight=
My 4 Piston Front CTSV Brembo 355mm Setup http://www.ls1gto.com/forums/showthr...659&highlight=
My 6 piston Front CTSV2 Brembo 355mm Setup http://www.ls1gto.com/forums/showthread.php?t=454917
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Last edited by itsme4g63; 07-14-2013 at 11:44 AM.
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Old 11-26-2012, 06:58 PM   #2
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On the hub prior wheel fitment:




Assembled with stock 18" gto wheel:








LET ME KNOW WHAT YOU GUYS THINK!!111

Last edited by itsme4g63; 11-29-2012 at 05:39 PM.
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Old 11-26-2012, 07:02 PM   #3
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Old 11-26-2012, 07:04 PM   #4
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What size rotor?
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Old 11-26-2012, 07:10 PM   #5
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Are those the 14" camaro rotors?
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Old 11-26-2012, 07:12 PM   #6
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Quote:
Originally Posted by choicesmade24...View Post
Are those the 14" camaro rotors?

Yezzir, 355mm (14" ).
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Old 11-26-2012, 07:19 PM   #7
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let try fit that on the goat on saturday since its sitting lol,look good behind thoses 18's
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Old 11-26-2012, 07:56 PM   #8
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That is definitely cool. The brakes on the V2 are superb.

That said, I don't get why people don't just get a BBK designed for the car. For just a bit more you can get a Stoptech kit.

Is the price the incentive here?
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Old 11-26-2012, 08:39 PM   #9
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$810 for the calipers, ~$160 rotors, $200? adapters, and $50 for pads. $1220. We're up in the aftermarket BBK price range now, though still a couple hundred cheaper, but that's using OEM quality rotors/pads too
i still want em :P

See if you can find a 6pot caliper made for an 18" rim on rockauto that has re-manufactured options, like the 17Z Brembos Bohman tried. Re-manufactured calipers will be the biggest selling point, since they're usually half the cost of new calipers. That's what makes the 17Z caliper so attractive: it costs more for one of these calipers new than a pair of reman. 17Zs.

Awesome work in the world of GTO brakes though! Keep it up!
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Last edited by HunterKiller89; 11-26-2012 at 08:44 PM.
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Old 11-26-2012, 09:44 PM   #10
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Awesome! This is much cheaper than the factory Aussie bbk.
Just out of curiosity, what is the specs for the Aussie factory bbl? I assume that they are 4 or 6 pistons?
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Old 11-26-2012, 11:38 PM   #11
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Quote:
Originally Posted by Afroman...View Post
Awesome! This is much cheaper than the factory Aussie bbk.
Just out of curiosity, what is the specs for the Aussie factory bbl? I assume that they are 4 or 6 pistons?

well, which setup are you referring?
Harrop's 6pot is for 15" rotors/19" rims whereas their 4pot is for 13.5" rotors, both of which are more expensive than the OEM stuff

StopTech has 332mm and 355mm (13" and 14") rotor setups, both using the same 4pot caliper for $2200 and $2700 respectively

Wilwood has 13" and 14" setups, both using a 6pot caliper, for $1500 and $1700. This is the closest any aftermarket solution matches the OP brake setup, but still costs you $500 more, or even more than that if you compare them with one of the other retrofit solutions out there (be it CTS-V V1 /w 17" rim, 18" rim, or 17Z brembos)

OEM equip is a 4pot 13" rotor setup($2100), a 4pot 13.5" rotor setup($4000), or a 6pot 14.25" ($5000) (optional DBA rotors available in same size), but I can't find who makes the calipers. I would assume Brembo or Harrop.
Note: OEM prices are in AUD, not USD

Last edited by HunterKiller89; 11-27-2012 at 12:05 AM.
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Old 11-27-2012, 12:17 AM   #12
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Quote:
Originally Posted by HunterKiller89...View Post
well, which setup are you referring?
Harrop's 6pot is for 15" rotors/19" rims whereas their 4pot is for 13.5" rotors, both of which are more expensive than the OEM stuff

StopTech has 332mm and 355mm (13" and 14") rotor setups, both using the same 4pot caliper for $2200 and $2700 respectively

Wilwood has 13" and 14" setups, both using a 6pot caliper, for $1500 and $1700. This is the closest any aftermarket solution matches the OP brake setup, but still costs you $500 more, or even more than that if you compare them with one of the other retrofit solutions out there (be it CTS-V V1 /w 17" rim, 18" rim, or 17Z brembos)

OEM equip is a 4pot 13" rotor setup($2100), a 4pot 13.5" rotor setup($4000), or a 6pot 14.25" ($5000) (optional DBA rotors available in same size), but I can't find who makes the calipers. I would assume Brembo or Harrop.
Note: OEM prices are in AUD, not USD

Wow! Thank you for clarifying that for me. I was thinking about the Harrop kit. Which isn't cheap.
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Old 11-27-2012, 09:34 AM   #13
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Quote:
Originally Posted by HunterKiller89...View Post
StopTech has 332mm and 355mm (13" and 14") rotor setups, both using the same 4pot caliper for $1700 and $2100 respectively

Fixed
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Old 11-27-2012, 10:04 AM   #14
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Oem aussie brakes are made by AP, which is a subsidiary of Brembo.

I wasn't concerned with cost here, but more with form/function, which I wasn't going to sacrafice over cost. Ending result is a totally bolt on bracket & I replicated oem spec grasp thickness, which for ctv1/2 (and most others) brembos are 32mm. The camaro/g8-gxp utilize rotors with such a thickness since they are basically a 5x120 version of the ctsv-1 front rotor.

The great thing about this for me is that I can piece everything together and have a plethora of rotor/pad choices.

All I have to say regarding the 17z calipers is that the pricing for them seems to be on par with these, also their oem grasp thickness is 32mm. I see others are utilizing the bmw 745 rotor with them, which is 30mm thick, which is at the service limit of what those calipers are already meant to grab prior replacement, which means its out of its optimal squeeze/operating range. With that in mind, I can only imagine what happens to the brake pad and/or rotor when those pistons push into them, I don't want to speculate but that's why I stick with the oem rotor thickness. But, I'm not trying to make this a confrontational/comparison post/thread of any sort (it's just something I wouldn't get into myself.), but one about the ctv2 calipers bolting on. So I'd appreciate if it would be the end of that here.

Thanks for the input/interest guys!

More deets/pics comming soon.



Edit: I was looking at 18z specs and listed them as 17z specs.

Last edited by itsme4g63; 11-28-2012 at 10:08 AM.
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Old 11-27-2012, 12:31 PM   #15
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Quote:
Originally Posted by itsme4g63...View Post
Oem aussie brakes are made by AP, which is a subsidiary of Brembo.

I wasn't concerned with cost here, but more with form/function, which I wasn't going to sacrafice over cost. Ending result is a totally bolt on bracket & I replicated oem spec grasp thickness, which for ctv1/2 (and most others) brembos are 32mm. The camaro/g8-gxp utilize rotors with such a thickness since they are basically a 5x120 version of the ctsv-1 front rotor.

The great thing about this for me is that I can piece everything together and have a plethora of rotor/pad choices.

All I have to say regarding the 17z calipers is that the pricing for them seems to be on par with utuhese.

Thanks for the input/interest guys!

More deets/pics comming soon.

$350 vs $810. Again, that's why i was wondering if you had any plans to experiment with
a re manufactured caliper to help bring the cost way down. Maybe I'll check if any of the
OEM 17Z rotors are in 5x120, as i was unaware there was such a huge thickness variation. Maybe just machine a set to fit our bolt pattern/hub?

This is the most attractive BBK option available, but I can imagine the other kit selling more due to cost, despite less than ideal rotors. I'm just trying to help you out by
suggesting a way to be more competitive financially, since your already win the performance category. It just so happens that helping you helps me
Someone should make a database of rotors that can be sorted by diameter, bolt pattern, and thickness to make diy kits like this easier to spec. Likewise for the calipers

That's the last I'll mention of other kits..just throwing info out there for everyone

Last edited by HunterKiller89; 11-27-2012 at 12:35 PM.
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Old 11-27-2012, 12:55 PM   #16
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Any spacers or anything required to run these brakes? Didnt you have a kit that needed a spacer added to the wheel to fit? Can you just bolt on your bracket and go with it or is there some other modifications that need to happen first (grinding the hub, the hub carrier?) Thanks!
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Old 11-27-2012, 06:42 PM   #17
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i would stay with factory brembo's if its a six piston design,not rebuild VW made for a truck or you might as well put a tundra front calipers on,Cts-v and Zr1 +Zl1 calipers are made for cars not trucks.His bracket made for it and at a minimal cost of calipers plus bracket and no cutting or smurfing shit up that dont have too do its a plus and its bolt on,all RD done....just saying
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Old 11-27-2012, 06:48 PM   #18
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Thumbs up brembos

Quote:
Originally Posted by CGMike...View Post
Any spacers or anything required to run these brakes? Didnt you have a kit that needed a spacer added to the wheel to fit? Can you just bolt on your bracket and go with it or is there some other modifications that need to happen first (grinding the hub, the hub carrier?) Thanks!

test fit on 18's on wednesday nite and im sure he will post pics
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Old 11-27-2012, 08:24 PM   #19
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FWIW, I am doing the same thing except I will be using the Brembo 2 piece rotors designed to work with this caliper on the CTSV. Got them for $685, and with very little work it was a bolt on affair. The calipers will be utilized with a custom built bracket like the OP has made. The only downfall is the much larger rotor may require a 19" wheel. I'm still waiting to hear back from Forgeline on if they can make it work or not with an 18".

The work done thusfar looks great OP.
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Old 11-28-2012, 07:48 AM   #20
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Quote:
Originally Posted by itsme4g63...View Post
I see others are utilizing the bmw 745 rotor with them, which is 30mm thick, which is 2mm below the service limit of what those calipers are already meant to grab prior replacement, which means its out of its optimal squeeze/operating range. With that in mind, I can only imagine what happens to the brake pad and/or rotor when those pistons push into them, I don't want to speculate but that's why I stick with the oem rotor thickness.

Nothing.

I thought Konnie the Goat already clarified that...
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Old 11-28-2012, 07:54 AM   #21
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Originally Posted by Kingsize...View Post
FWIW, I am doing the same thing except I will be using the Brembo 2 piece rotors designed to work with this caliper on the CTSV. Got them for $685, and with very little work it was a bolt on affair. The calipers will be utilized with a custom built bracket like the OP has made. The only downfall is the much larger rotor may require a 19" wheel. I'm still waiting to hear back from Forgeline on if they can make it work or not with an 18".

The work done thusfar looks great OP.

That's a heck of deal on the 2 piece rotors, but what are replacement rings going to cost? Just out of curiosity, what do those weight? Some of the Mercedes AMG models have 2 piece rotors and despite the aluminum hat they're still tanks compared to Brembo's aftermarket unit.
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Old 11-28-2012, 08:06 AM   #22
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Quote:
Originally Posted by itsme4g63...View Post
Oem aussie brakes are made by AP, which is a subsidiary of Brembo.

I wasn't concerned with cost here, but more with form/function, which I wasn't going to sacrafice over cost. Ending result is a totally bolt on bracket & I replicated oem spec grasp thickness, which for ctv1/2 (and most others) brembos are 32mm. The camaro/g8-gxp utilize rotors with such a thickness since they are basically a 5x120 version of the ctsv-1 front rotor.

The great thing about this for me is that I can piece everything together and have a plethora of rotor/pad choices.

All I have to say regarding the 17z calipers is that the pricing for them seems to be on par with these, also their oem grasp thickness is 34mm, good luck finding a rotor that thick besides the car it came from (only other one I know of is in the Nissan GTR, which rotors are 1k a piece for). I see others are utilizing the bmw 745 rotor with them, which is 30mm thick, which is 2mm below the service limit of what those calipers are already meant to grab prior replacement, which means its out of its optimal squeeze/operating range. With that in mind, I can only imagine what happens to the brake pad and/or rotor when those pistons push into them, I don't want to speculate but that's why I stick with the oem rotor thickness. But, I'm not trying to make this a confrontational/comparison post/thread of any sort (it's just something I wouldn't get into myself.), but one about the ctv2 calipers bolting on. So I'd appreciate if it would be the end of that here.

Thanks for the input/interest guys!

More deets/pics comming soon.

I'm glad your not making a comparison but your information is not correct above.

Nominal thickness on a VW rotor is 32mm Minium Rotor thickness is 30mm meaning that rotor can be cut to 30mm and still be used. Nominal thickness of a BMW rotor is 30mm meaning that if you cut the VW rotor down to it's minium thickness you are still within safe optimal operating conditions set by the OEM. Normally these thickness are set becuase of the metal left on the rotor will get to thin this woudl not be the case if the rotor started out at 30mm.

Would you be interested in fitting a CCW on there or any aftermarket wheel on there with a lip?


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Old 11-28-2012, 10:07 AM   #23
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Quote:
Originally Posted by kuzsgto...View Post
i would stay with factory brembo's if its a six piston design,not rebuild VW made for a truck or you might as well put a tundra front calipers on,Cts-v and Zr1 +Zl1 calipers are made for cars not trucks.His bracket made for it and at a minimal cost of calipers plus bracket and no cutting or smurfing shit up that dont have too do its a plus and its bolt on,all RD done....just saying

Easy there killer! Yes I am attempting a test fit of 18" tonight.

Quote:
Originally Posted by bohnman...View Post
I'm glad your not making a comparison but your information is not correct above.

Nominal thickness on a VW rotor is 32mm Minium Rotor thickness is 30mm meaning that rotor can be cut to 30mm and still be used. Nominal thickness of a BMW rotor is 30mm meaning that if you cut the VW rotor down to it's minium thickness you are still within safe optimal operating conditions set by the OEM. Normally these thickness are set becuase of the metal left on the rotor will get to thin this woudl not be the case if the rotor started out at 30mm.

Would you be interested in fitting a CCW on there or any aftermarket wheel on there with a lip?


The problem with the midwest is it cold out and makes it time to mod cars and escape the women inside.


Aye I did make a mistake and will correct it, I was looking at the 18z caliper specs which utilize the 350mm 34mm rotors, the 17z 330mm utilize the 32mm ones. Either way, I stick with oem thickness.

I can try the ccw but imagine if offset is any more than +38, than it will rub.
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Old 11-28-2012, 10:55 AM   #24
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Originally Posted by Havoc...View Post
That's a heck of deal on the 2 piece rotors, but what are replacement rings going to cost? Just out of curiosity, what do those weight? Some of the Mercedes AMG models have 2 piece rotors and despite the aluminum hat they're still tanks compared to Brembo's aftermarket unit.

It is around $400 for both, but I can also get ones from Coleman for around $360 if need be. They are the ones who are currently making my custom hats for the rear as well.

The Hat and Rotor weigh in at -.34 pounds from my stock rotor, so it's basically a wash.
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Old 11-28-2012, 12:10 PM   #25
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FWIW, I am doing the same thing except I will be using the Brembo 2 piece rotors designed to work with this caliper on the CTSV. Got them for $685, and with very little work it was a bolt on affair. The calipers will be utilized with a custom built bracket like the OP has made. The only downfall is the much larger rotor may require a 19" wheel. I'm still waiting to hear back from Forgeline on if they can make it work or not with an 18".

The work done thusfar looks great OP.

Aye, those are for a 19" wheel minimum thats guaranteed lol. Unless its a very large 18! I am 90% done with the 370mm ctv2 front rotor conversion bracket as well, at this point its overkill, and I'm just doing it to get it done. I beieve brembo makes both 1 & 2 piece rotors for ctsv2 front.
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Old 11-28-2012, 01:47 PM   #26
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Originally Posted by itsme4g63...View Post
Aye, those are for a 19" wheel minimum thats guaranteed lol. Unless its a very large 18! I am 90% done with the 370mm ctv2 front rotor conversion bracket as well, at this point its overkill, and I'm just doing it to get it done. I beieve brembo makes both 1 & 2 piece rotors for ctsv2 front.

Yes they do, but the single piece is HEAVY. Lol
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Old 11-29-2012, 05:40 PM   #27
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Finally got around to mounting stock 18's over them, clearance is minimal but they fit nonetheless! If they clear these ridiculously offset (+48) stock 18's then they should clear pretty much anything else! First/second post updated!

Last edited by itsme4g63; 11-29-2012 at 05:42 PM.
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Old 11-29-2012, 06:26 PM   #28
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I can try the ccw but imagine if offset is any more than +38, than it will rub.

CCW fronts are +42mm with the big lip. If they clear I may opt for this setup over the VW setup.
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Old 11-29-2012, 09:40 PM   #29
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Cool

Quote:
Originally Posted by itsme4g63...View Post
Finally got around to mounting stock 18's over them, clearance is minimal but they fit nonetheless! If they clear these ridiculously offset (+48) stock 18's then they should clear pretty much anything else! First/second post updated!

Hooray!!
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Old 11-30-2012, 06:03 AM   #30
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Subaru sti 4-pot brembo calipers spec the same exact pad that are used on the cts-v brembo calipers. the Subaru rotors are 30mm thickness; same as the 745i. this proported "caliper grasp" issue is a non issue.

each brembo pad is 15mm X 2 thick (about the thickness of the rotor itself!) so that leaves 1mm of variance on each side-- it comes down to be pretty insignificant to the functionality of the squeezing range of the caliper. I am all for a thicker rotor ( more heat dissipation) but its just not neccessary.
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