|Wheels and Tires Talk Sponsored by The Tire Rack Discuss issues related to wheels and tires|
|08-19-2008, 04:11 PM||#1|
Drives: '08 G6 GXP/'07 GSXR
Join Date: Aug 2006
the ss is suposed to come with 20"s? dont you folks think that is too big for a performance based car? when i think of 20" wheels the first thing that comes to mind is a blinged out 300c rolling down the highway
|08-19-2008, 04:38 PM||#2|
Keeper of the Faith
Drives: 2001 Z28 Agressively
Join Date: Apr 2008
2010 Camaro SS R6P
2001 Camaro Z28
1969 Camaro SS clone
|08-19-2008, 05:10 PM||#3|
Farewell 2010 1LT/RS...
Drives: 2011 2SS/RS SGM
Join Date: Mar 2008
Location: Houston, TX
I guess I don't see there being much of a problem here. The overall tire diameter is roughly the same regardless of whether you are running 18", 19", or 20" wheel options.
18": 245/55R18 = 28.61"
19": 245/50R19 = 28.65"
20": 275/40R20 = 28.66"
The difference in tire sidewall height is 1" between the 18" and the 20". Depending on the particular tires used, that 1" could make performance driving the same or scary. Too soft a sidewall and the ride is more comfortable but performance cornering is questionable. With a stiff enough sidewall, I don't think many people would be able to tell the difference.
Comparing unsprung weight, given that the overall size is the same, you are gaining tire weight and wheel weight by going up in wheel diameter. Since specs for the Camaro wheel/tire combos aren't yet available, here's an example for the Z06 (only found this information on one website so validity is questionable):
OEM 18" front wheel: 22 lbs ea.
OEM 19" rear wheel: 26 lbs ea.
OEM Goodyear F1 Supercar extended mobility front tire 275/35ZR18: 29 lbs ea. (new)
OEM Goodyear F1 Supercar extended mobility rear tire 325/30ZR19: 36 lbs ea. (new)
18" total weight: 51 lbs. each
19" total weight: 62 lbs. each
Granted the Z06 example probably isn't the best comparison because by moving up to the wider tire, you are also gaining an additional 1.1" in tire diameter and weight (25.57" for 18", 26.67" for 19").
Your best bet is a trade-off between reducing unsprung weight, increasing tire sidewall stability, and comfort in everyday driving. It will be different for everyone.
But it mostly comes down to asthetics. Which do you like better - more wheel or more tire?
|08-19-2008, 05:35 PM||#4|
Join Date: Oct 2006
Location: Crapramento, Crapifornia
I'll tell you at first I was against the 20s, but after thinking about the pizzas they're stuff inside for brakes, I don't oppose it now. When I learned about the 28"+ tall tires, I was a little concerned. I think I'll lower the aspect ratio on the first replacement set if tires I go through. Lower height equals a little better acceleration (how much, I don't really know) and I'll give up some comfort due to the shorter sidewall, but won't really care.
I wonder what is the largest size I can run on the rears though. The biggest I could run on my '02 was a 335-35-17 and am hoping I can get into the 3XXs with this car. Fat rear tires are cool IMHO
"...What IS true: We anticipated that this would happen - we are never finished - and yes, Ford DOES deserve to win now and then. To think that GM can come out with a car to make ford throw in the towel is simply foolhardy..." - fbodfather
|08-19-2008, 08:00 PM||#5|
Drives: 1998 Z28 M6
Join Date: May 2008
Location: Lake Forest, CA
Less unsprung weight is almost always a good thing.
The only way I can think of to have both a lighter weight wheel and a 20" diameter is to go with a set of aftermarket Magnesium/Ultralight wheels...
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