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PostPosted: Wed Mar 11, 2015 11:00 am 
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Ok, as some of you know I am going to try the brembo upgrade on my GP with CTS-V brakes. I have some of the stuff together and I did a test fit just now. These won't clear the spokes on my wheels so I am going to need some spacers and longer studs. The studs shouldn't be an issue but I know that only certain spacers are safe to use, any recommendations?

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PostPosted: Wed Mar 11, 2015 11:02 am 
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I think what you want are the hub centric ones. Not sure entirely.

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PostPosted: Wed Mar 11, 2015 2:08 pm 
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If you're spacing your wheel out past where the hub isn't centering the wheel, you'll need hubcentric spacers.

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PostPosted: Wed Mar 11, 2015 2:10 pm 
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haro1225 wrote:
Ok, as some of you know I am going to try the brembo upgrade on my GP with CTS-V brakes. I have some of the stuff together and I did a test fit just now. These won't clear the spokes on my wheels so I am going to need some spacers and longer studs. The studs shouldn't be an issue but I know that only certain spacers are safe to use, any recommendations?


Or you could sell the wheels to me and buy CTS-V wheels instead... :beerchug:

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PostPosted: Wed Mar 11, 2015 2:14 pm 
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CTS-V wheels would require a re-drill or adapters.

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95 SLE... a keeper. 241k miles. Low and Slow.
97 BMW 528i
98 Infiniti vq35'd i30: 13.3@104mph, 30MPG Hwy (RIP)
02 Jag X-type
03 BMW M5
05 Chevy Cobalt LS
07 Infiniti G35s 6MT (Sold)
07 Ducati Monster S2R 800 with DS1000 swap
83 Yamaha IT175K
72 Yamaha DS7: '74 RD250 swap, JL chambers

Info on dropping a 92-99: Here.


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PostPosted: Wed Mar 11, 2015 3:01 pm 
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95naSTA wrote:
CTS-V wheels would require a re-drill or adapters.

It was just a stab at trying to score the proper rims for my car...

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2004 Bonneville GXP Crimson Tintcoat- Casual fuel gauge | Brake Performance drilled/slotted rotors front and rear| Retrofit Morimoto mini H1 | clear corners | disabled DRL | 3000K HID fogs | 5% tint | K&N | Yakima rack with fairing, bike rails and kayak rack | Intermittent radio display
1995 Bonneville SSE Deep Amethyst Pearl- SSEI tails | 5% tint | 3 12jlw3v2 in custom enclosure -Gone
1991 Bonneville LE Blue- Alloy spokes -Deceased(deer)


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PostPosted: Wed Mar 11, 2015 4:02 pm 
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I don't think they will need to come out that far. This is what it looked like while I was test fitting.
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2004 GTO....LS1, LSA supercharged 525whp, 6MT
96 SSEi...September 2010 COTM........GONE
04 GTP comp G.... December 2015 COTM........GONE
2013 Audi Allroad Quattro

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PostPosted: Wed Mar 11, 2015 4:43 pm 
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You just have to figure out if the hub is still centering the wheel at that point.

Take the distance the hub sticks out past the rotor, subtract the depth of the chamfer in the hub hole of the wheel and subtract the distance of gap shown in that pic (as long as the caliper isn't touching). If you have a positive number, you're good to go.

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95 SLE... a keeper. 241k miles. Low and Slow.
97 BMW 528i
98 Infiniti vq35'd i30: 13.3@104mph, 30MPG Hwy (RIP)
02 Jag X-type
03 BMW M5
05 Chevy Cobalt LS
07 Infiniti G35s 6MT (Sold)
07 Ducati Monster S2R 800 with DS1000 swap
83 Yamaha IT175K
72 Yamaha DS7: '74 RD250 swap, JL chambers

Info on dropping a 92-99: Here.


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PostPosted: Wed Mar 11, 2015 6:58 pm 
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I would also suggest leaving yourself enough room for new brake pads/rotors. It would be awkward putting new brakes on the upgrade, and finding you need more spacer.

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PostPosted: Wed Mar 11, 2015 7:23 pm 
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The brembos use a fixed caliper. :wink:

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2004 GTO....LS1, LSA supercharged 525whp, 6MT
96 SSEi...September 2010 COTM........GONE
04 GTP comp G.... December 2015 COTM........GONE
2013 Audi Allroad Quattro

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PostPosted: Wed Mar 11, 2015 7:41 pm 
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Since I'm assuming you have been doing a bunch of research on this already, what all is involved in the swap other than the wheels not fitting? I think I'm going to be due for brakes soon and the car could use a little more stopping power. Is the bonnie the same as the GP brake wise? I'm not completely opposed to replacing wheels if necessary.

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PostPosted: Wed Mar 11, 2015 7:51 pm 
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Randy (yourgrandma) has done them on his Bonneville so I know it's possible. You have to have 18's at the very least. And then it's calipers, pads, 2007 Mustang GT500 front rotors, zzp extended SS brake hoses, caliper bracket bolts and banjo bolts from an 00ish F body, and then these little sleeves that go around the bracket bolts as the new bolts are thinner (I don't know if that step is needed on the bonneville.)

I am following this write up.
http://www.grandprixforums.net/threads/ ... S-V-brakes

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2004 GTO....LS1, LSA supercharged 525whp, 6MT
96 SSEi...September 2010 COTM........GONE
04 GTP comp G.... December 2015 COTM........GONE
2013 Audi Allroad Quattro

yourgrandma wrote:
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PostPosted: Wed Mar 11, 2015 9:52 pm 
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If you're looking to keep your 17s, there's always F-body brake calipers or better yet C5 Z06 ones. Both will still fit under the 17 inch rim, and can be used with the stock rotor or the larger GXP rotors.

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PostPosted: Tue Mar 17, 2015 9:01 pm 
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Well things aren't going so well, I did manage to figure out what size spacer I'll need, but in the process I snapped a stud. Also the caliper is slightly scraping the rotor, but I can fix that with washers. I want to have these done before the Michigan meet, but every time I attempt something I run into a snag so I have doubts.

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2004 GTO....LS1, LSA supercharged 525whp, 6MT
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04 GTP comp G.... December 2015 COTM........GONE
2013 Audi Allroad Quattro

yourgrandma wrote:
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PostPosted: Tue Mar 17, 2015 10:50 pm 
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Just gotta keep at it, the meet is still a ways away.

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PostPosted: Sat Mar 21, 2015 1:15 pm 
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Anybody know the hub bore size on GXP wheels?

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2004 GTO....LS1, LSA supercharged 525whp, 6MT
96 SSEi...September 2010 COTM........GONE
04 GTP comp G.... December 2015 COTM........GONE
2013 Audi Allroad Quattro

yourgrandma wrote:
Hi.


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PostPosted: Sat Mar 21, 2015 2:07 pm 
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LOTS of Mods
same as all of the GP and any other 5x115 GM car


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PostPosted: Sat Mar 21, 2015 2:24 pm 
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So 70.1mm?

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2004 GTO....LS1, LSA supercharged 525whp, 6MT
96 SSEi...September 2010 COTM........GONE
04 GTP comp G.... December 2015 COTM........GONE
2013 Audi Allroad Quattro

yourgrandma wrote:
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PostPosted: Sat Mar 21, 2015 2:43 pm 
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Should be 70.3 mm

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PostPosted: Sat Mar 21, 2015 2:50 pm 
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I just looked at a place that makes custom spacers for what I'd need for $60. But they want $25 for shipping so the search continues.

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2004 GTO....LS1, LSA supercharged 525whp, 6MT
96 SSEi...September 2010 COTM........GONE
04 GTP comp G.... December 2015 COTM........GONE
2013 Audi Allroad Quattro

yourgrandma wrote:
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