New wheels for GXP
- 05joenov
- SLE Member

- Posts: 65
- Joined: Thu Dec 16, 2010 2:42 am
- Year and Trim: 2005 Bonneville GXP
- Location: Farmington, MN
New wheels for GXP
Hello,
I'm just about done with my time over here in the Middle East, and want to get some new wheels for my GXP when I get home. I've been searching through the forums, and understand I can run a 20" wheel. I went to tirerack.com and most of the 20s that say they will fit have these specs, or very close. The wheel itself is 20x8.
Offset: 42mm
Backspacing: 6.18"
Bolt Pattern: 5-115
Rec. Tire Size:245/40-20
What is the range of tolerances for offset and backspacing? I would use their recommended tire size. Thanks!
Joe
I'm just about done with my time over here in the Middle East, and want to get some new wheels for my GXP when I get home. I've been searching through the forums, and understand I can run a 20" wheel. I went to tirerack.com and most of the 20s that say they will fit have these specs, or very close. The wheel itself is 20x8.
Offset: 42mm
Backspacing: 6.18"
Bolt Pattern: 5-115
Rec. Tire Size:245/40-20
What is the range of tolerances for offset and backspacing? I would use their recommended tire size. Thanks!
Joe
2016 GMC Sierra SLT
2005 Pontiac Bonneville GXP
1979 Pontiac Firebird Trans Am
2005 Pontiac Bonneville GXP
1979 Pontiac Firebird Trans Am
- yourgrandma
- Certified Bonneville Nut

- Posts: 2425
- Joined: Mon May 26, 2008 6:56 pm
- Year and Trim: '02 SSEi
Re: New wheels for GXP
You can get away with a little wiggle room on either side of both numbers. Half an inch or so. But remember what visual effect they will have. You don't want the tires sticking out past the fenders or tucked way in. You have to balance offset and backspace. Luckily there should be a good assortment with the appropriate specs.
02 SSEi-Turning money into tire smoke, very efficiently.


- 05joenov
- SLE Member

- Posts: 65
- Joined: Thu Dec 16, 2010 2:42 am
- Year and Trim: 2005 Bonneville GXP
- Location: Farmington, MN
Re: New wheels for GXP
I've been looking around for specs on the gxp wheel backspacing. Anyone know what the OEM measurement is?
2016 GMC Sierra SLT
2005 Pontiac Bonneville GXP
1979 Pontiac Firebird Trans Am
2005 Pontiac Bonneville GXP
1979 Pontiac Firebird Trans Am
- 05joenov
- SLE Member

- Posts: 65
- Joined: Thu Dec 16, 2010 2:42 am
- Year and Trim: 2005 Bonneville GXP
- Location: Farmington, MN
Re: New wheels for GXP
And they are on! 20 inch Zinik Z32 with Kumho tires:


It just rained yet again so will get it all cleaned up and some better pictures.


It just rained yet again so will get it all cleaned up and some better pictures.
2016 GMC Sierra SLT
2005 Pontiac Bonneville GXP
1979 Pontiac Firebird Trans Am
2005 Pontiac Bonneville GXP
1979 Pontiac Firebird Trans Am
- dpnewfie
- Posts like an LN3

- Posts: 598
- Joined: Thu May 22, 2008 8:01 am
- Year and Trim: 2005 GXP
- Location: Conroe, Texas
Re: New wheels for GXP
Oh my............that's nice. 
2012 CTS-V Coupe, 4k miles and counting.
2005 Bonneville GXP, 200k and SOLD!J Wikoff wrote:It has been an honor and privilage to have been serviced by you.
- sethjamesrimrodt
- Posts like an L36

- Posts: 880
- Joined: Mon Mar 28, 2011 10:09 am
- Year and Trim: 2004 GXP
- Location: Mason City, Ia
Re: New wheels for GXP
The back brakes look so tiny... But other then that it looks good!
Seth


Bonita 78,000 miles traded on a CTS4


Bonita 78,000 miles traded on a CTS4
RogueSSEi wrote: Bet she'll stop on a dime and give you 3 pennies back!
- 05joenov
- SLE Member

- Posts: 65
- Joined: Thu Dec 16, 2010 2:42 am
- Year and Trim: 2005 Bonneville GXP
- Location: Farmington, MN
Re: New wheels for GXP
Thanks! Haha yes from that picture they do like tiny! Maybe the next project lol.
2016 GMC Sierra SLT
2005 Pontiac Bonneville GXP
1979 Pontiac Firebird Trans Am
2005 Pontiac Bonneville GXP
1979 Pontiac Firebird Trans Am
-
00Beast
- Retired Site Developer

- Posts: 20960
- Joined: Tue May 27, 2008 10:30 pm
- Year and Trim: '17 Silverado 1500
- Location: MN/IA
- Contact:
Re: New wheels for GXP
Looks Great Joe! We still need to meet up, seeing as you're so close, lol.
Bye Bye:

RIP sandrock

RIP sandrock
Sirius wrote:Think about it. You’re tooling down the road in your Prius, knowing full-well that this thing being green is as big a sham as federally mandated ethanol-enriched gas, Russia pulling out of Ukraine, and Obamacare.
- dpnewfie
- Posts like an LN3

- Posts: 598
- Joined: Thu May 22, 2008 8:01 am
- Year and Trim: 2005 GXP
- Location: Conroe, Texas
Re: New wheels for GXP
Hey Joe, any chance of getting a front to back shot to give me an idea of the offset?
2012 CTS-V Coupe, 4k miles and counting.
2005 Bonneville GXP, 200k and SOLD!J Wikoff wrote:It has been an honor and privilage to have been serviced by you.
- 05joenov
- SLE Member

- Posts: 65
- Joined: Thu Dec 16, 2010 2:42 am
- Year and Trim: 2005 Bonneville GXP
- Location: Farmington, MN
Re: New wheels for GXP
Sure I'll get some more pictures tomorrow! And Beast yes we do at some point!
2016 GMC Sierra SLT
2005 Pontiac Bonneville GXP
1979 Pontiac Firebird Trans Am
2005 Pontiac Bonneville GXP
1979 Pontiac Firebird Trans Am
- 05joenov
- SLE Member

- Posts: 65
- Joined: Thu Dec 16, 2010 2:42 am
- Year and Trim: 2005 Bonneville GXP
- Location: Farmington, MN
Re: New wheels for GXP
dpnewfie wrote:Hey Joe, any chance of getting a front to back shot to give me an idea of the offset?




2016 GMC Sierra SLT
2005 Pontiac Bonneville GXP
1979 Pontiac Firebird Trans Am
2005 Pontiac Bonneville GXP
1979 Pontiac Firebird Trans Am
- dpnewfie
- Posts like an LN3

- Posts: 598
- Joined: Thu May 22, 2008 8:01 am
- Year and Trim: 2005 GXP
- Location: Conroe, Texas
Re: New wheels for GXP
Awesome, Thanks! They fit as good as they look. 
2012 CTS-V Coupe, 4k miles and counting.
2005 Bonneville GXP, 200k and SOLD!J Wikoff wrote:It has been an honor and privilage to have been serviced by you.
-
MARCTHEDUBBS
- SLE Member

- Posts: 92
- Joined: Wed Feb 23, 2011 4:41 pm
- Year and Trim: 2011 Kia Optima SX
2014 GMC Sierra - Location: Flint, MI
Re: New wheels for GXP
I gotta be honest, when I read:
Boy was I happy to be wrong! Those whells look GREAT on that car. Very nice choice.
I shuddered thinking of the awefulness that would follow.05joenov wrote:I've been searching through the forums, and understand I can run a 20" wheel.
Boy was I happy to be wrong! Those whells look GREAT on that car. Very nice choice.
Marc

Not enough mods for me yet
Too many mods for my wife already

Not enough mods for me yet
Too many mods for my wife already
- nos4blood70
- Certified Bonneville Nut

- Posts: 9522
- Joined: Mon May 10, 2010 6:11 pm
- Year and Trim: 2003 SLE
- Location: Chicago, IL
Re: New wheels for GXP
They look glorious! Nice job! They really fit the GXP body style.
-
01bonneSC
- Certified Bonneville Nut

- Posts: 4938
- Joined: Sat May 24, 2008 5:18 pm
- Year and Trim: 05 Chevy 'Hoe
1997 'maro (3.8L M5)
89 SkiDoo - Location: Sycamore, IL
Re: New wheels for GXP
No offense, but I like the stockers better.
-
Bad GXP
- SLE Member

- Posts: 43
- Joined: Fri Nov 05, 2010 11:35 pm
- Year and Trim: 2005 Midnight Blue GXP
- Location: Toronto, Ontario, Canada
Re: New wheels for GXP
Looks cool.
Could be just me but I think the car has this "lifted" look with the 20s on there. Perhaps a lowering kit?
Any sacrifice on ride quality?
Enjoy!
Could be just me but I think the car has this "lifted" look with the 20s on there. Perhaps a lowering kit?
Any sacrifice on ride quality?
Enjoy!
Praim

Midnight Blue 2005 Bonneville GXP - 182,500 km, all engine oil seals replaced, upgraded to Energy Suspension polyurethane sway bar and end link bushings, Volant CAI, 4300K HID headlights, Continental DW Extreme Contact tires
1982 White Toyota Celica GTS - lots and lots of mods on this classic and lots of track time. Excellent condition.

Midnight Blue 2005 Bonneville GXP - 182,500 km, all engine oil seals replaced, upgraded to Energy Suspension polyurethane sway bar and end link bushings, Volant CAI, 4300K HID headlights, Continental DW Extreme Contact tires
1982 White Toyota Celica GTS - lots and lots of mods on this classic and lots of track time. Excellent condition.
-
Madcarpenter
- SSE Member

- Posts: 135
- Joined: Sat Mar 17, 2012 2:23 am
- Year and Trim: 1995 SE
- Location: Portland, OR... Nine months of rain per year, yet wicked expensive tap water...
Re: New wheels for GXP
I'm not a fan of the 'oversized 'bling!' rims with bicycle tires' look.
Too much metal, not enough rubber.
Cartoon-ish.
But your opinion is the only one that truly matters. If you like 'em, they're perfect.
Too much metal, not enough rubber.
Cartoon-ish.
But your opinion is the only one that truly matters. If you like 'em, they're perfect.





