Tires and Wheels List Updated on 3/25/2020

Jareth

Goblin Guru
Guess I don’t know much about wheels, if stock size for the SS is 18 why do so many run 17’s ?

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Chubbs

Well-Known Member
Guess I don’t know much about wheels, if stock size for the SS is 18 why do so many run 17’s ?
For me, it's for both looks and performance.

The stock 18's, especially the skinny 215 wide tires, look like bicycle tires on the goblin. I think the look of a meatier 255 wide tire or so, especially with a shorter tire, looks better.

2nd, unsprung weight is less for a small diameter tire. And since we don't have huge brakes to clear, maximum performance will be achieved by the smallest diameter (lightest) wheel and tire combo tire.

Rubber selection is really limited for 15 and 16" wheels though. 17's are about the smallest tire possible while still having a good selection of tires to choose from.
 

Gtstorey

Goblin Guru
Cheaper performance tires and probably tires in general.

Lighter wheel/tire combo, but of course you could continue to go even smaller.

Final gearing change
 

Robinjo

Goblin Guru
Guess I don’t know much about wheels, if stock size for the SS is 18 why do so many run 17’s ?
I swapped to 17" wheels but am keeping the same overall aspect ratio (mine will be mostly street use). I did this because finding good tires in 18" was both hard and more expensive. I can get half used pull-off from a race shop locally for about $100 a set. Now if it was a race only vehicle I'd look at 16's or 15's if those would fit.
 

Robinjo

Goblin Guru
I swapped to 17" wheels but am keeping the same overall aspect ratio (mine will be mostly street use). I did this because finding good tires in 18" was both hard and more expensive. I can get half used 225-45R17 pull-off from a race shop locally for about $100 a set. Now if it was a race only vehicle I'd look at 16's or 15's if those would fit.
 

Corgithulhu

Well-Known Member
I used this tool pretty heavily to work up my fitment: https://tiresize.com/wheel-offset-calculator/

OEM Cobalt SS tires, at least my 2007 SS/SC, are 215/45-18 with +42mm offset wheels and no factory spacers.

I went with 245/45-17 tires on +38mm offset wheels with 25mm (1 inch) spacers. If you plug those numbers into that linked tool, you'll see my inner sidewalls get bumped out about half an inch, the outer sidewalls a little more, but the diameters are dead-on the same. I love that tool.

I know this is getting a little outside of the topic, but it's really helpful for people considering stepping down to 17's or lower from SS 18's.
 

Robinjo

Goblin Guru
Goblin Builder: Robinjo
Chassis Number: 405
Frame Type / Color: Standard Full Cage / Red
Donor Year / Engine: 2006 2.0L Supercharged
Wheel Make / Model: Konig Myth (Red)
Front Wheel - Size / Offset / Bolt Pattern: 17x8.0" /+43mm / 5-114.3mm (No Spacers)
Rear Wheel - Size / Offset / Bolt Pattern: 17x8.0" /+43mm / 5-114.3mm (No spacers)
Wheel Weight in lbs.: 20.7 lbs
Tire Make / Model: Continental Extreme Contact
Front Tire Size: 225/45R17
Rear Tire Size: 225/45R17
Seat Make / Model: Cobalt SS Stockers!

2022-10-15 Drivers Side.JPG2022-10-15 Passenger Side.JPG
 

TravMac

Well-Known Member
As much as I used to reference this page, and I never filled it out... time to change that!

Goblin Builder: TravMac
Chassis Number: 253
Frame Type / Color: Extended Full Cage / Matte Grey
Donor Year / Engine: 2007 2.0L Supercharged
Wheel Make / Model: Konig Hexaform
Front Wheel - Size / Offset / Bolt Pattern: 15x8" /+25mm / 4-100mm (No Spacers)
Rear Wheel - Size / Offset / Bolt Pattern: 15x8" /+25mm / 4-100mm (No spacers)
Centering Rings: 57.1 to 73.1 (Cobalt 4-lug hub to wheel)
Wheel Weight in lbs.: 12.6 lbs
Tire Make / Model: Toyo R888R
Front Tire Size: 225/45R15
Rear Tire Size: 225/45R15
Seat Make / Model: Kirkey 65 series, 18.5" Driver, Kirkey 38 series, 18.5" Passenger
 

Corgithulhu

Well-Known Member
I realized I also never posted mine here for reference:


Goblin Builder: Corgithulhu
Chassis Number: 318
Frame Type / Color: Extended full cage/purple
Donor Year / Engine: ‘07 2.0L supercharged
Wheel Make / Model: Konig Countergram p/n CT8751438C
Front Wheel - Size / Offset / Bolt Pattern: 17x8 / +38mm (+25mm spacers/bolt pattern adapters) / 5-114.3
Rear Wheel - Size / Offset / Bolt Pattern: 17x8 / +38mm (+25mm spacers/bolt pattern adapters) / 5-114.3
Wheel Weight in lbs.: 17.42
Tire Make / Model: Falken Azenis RT615K+
Front Tire Size: 245/45ZR17
Rear Tire Size: 245/45ZR17
Seat Make / Model: Nothing notable, something from one of the online retailers
 

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Scott #321

Well-Known Member
Goblin Builder: Scott321
Chassis Number: 321
Frame Type / Color: Extended full cage easy entry
Donor Year / Engine: ‘09 2.0L turbocharged
Wheel Make / Model: MST Suzuka 17X9.5
Front Wheel - Size / Offset / Bolt Pattern: 17x9.5 / +20mm / 5-114.3
Rear Wheel - Size / Offset / Bolt Pattern: 17x9.5 / +20mm / 5-114.3
Wheel Weight in lbs.: 20
Tire Make / Model: Nitto NTO1
Front Tire Size: 255/40ZR17
Rear Tire Size: 255/40ZR17
Seat Make / Model: Corbeau FX1 supplied by DF
 

Attachments

kurbkilla

Member
Goblin Builder: Kurbkilla
Chassis Number: 385
Frame Type / Color: Extended, track, easy entry doors / Black
Donor Year / Engine: 2007 / 2.0 supercharged
Wheel Make / Model: MOTEGI RACING MR154 Battle / Black Painted
Front Wheel - Size / Offset / Bolt Pattern: 17x8 / +30 / 5x110
Rear Wheel - Size / Offset / Bolt Pattern: 17x8 / +30 / 5x110
Wheel Weight in lbs.: 20.59 lbs
Tire Make / Model: Kumho Ecsta V730
Front Tire Size: 225/45-17
Rear Tire Size: 235/45-17
Seat Make / Model: Corbeau FX1 supplied by DF
 

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escapepilot

Well-Known Member
Goblin Builder: Escapepilot
Chassis Number: 316
Frame Type / Color: Extended, track, double door bars / misty blue
Donor Year / Engine: 2006 / 2.0 supercharged
Wheel Make / Model: American Racing Torq- Thrust M AR105 in Anthracite
Front Wheel - Size / Offset / Bolt Pattern: 17x7.5 / +45 / 5x110
Rear Wheel - Size / Offset / Bolt Pattern: 18x 10 / +24 / 5x114.5 (adapters used in rear)
Wheel Weight in lbs.: ?? lbs
Tire Make / Model: Falken Azeris RT615K+
Front Tire Size: 245/45R17
Rear Tire Size: 295/40R18
Seat Make / Model: IKON
 
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