Was wondering do they rub. does it throw off your speedo? Better ride and handeling?
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Anyone tried 235/50r18 size on gtp tock rims
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Glad someone posted on this, because I just put on a set of 235/55/16 Goodyears on my stock steelies (tires were free) and there is no rubbing at all. The car handles like a champ, even though they are only on the front. Understeer has vastly been reduced compared to the stock 215/60/16's. As far as throwing off your speedo, yes it will, at 60mph, your speedo wil show 59.13mph. With a set of 235/45/18 your speedo @ 60 will read 61.21mph.
So, unless you get a tune, you'll have to settle with 1 mph over or under your actual speed. Heres a great site for calculating.
http://www.dakota-truck.net/CGI-BIN/TireCalc.cgi2007 G5 Base Model
Black 5 Speed
Walmart - A store where you can buy a shot gun, ammunition, a ski mask, a baseball bat, a meat cleaver and map of the middle east, but you can't buy a CD that has a "Parental Advisory" sticker.
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I run 245/40-18s with no problem, and someone else on here runs a 255, but they are smaller diameter or the same as stock. The real question is why would you want to run a larger than stock diamter tire which will just make the car slower?04 CTS-V......like a G6, but with an extra 200hp, a proper transmission, and it is correct wheel drive:
Self described crotchety old man!
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Originally posted by mbiker97I run 245/40-18s with no problem, and someone else on here runs a 255, but they are smaller diameter or the same as stock. The real question is why would you want to run a larger than stock diamter tire which will just make the car slower?2008 Chevrolet Cobalt SS T/C
Black/Black coupe
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Slower, maybe depending on which tire you chose, but were talking a difference of 1 mph or less at 60 mph... There really is no noticable difference.
Remember though, the middle number in the tire isn't the sidewall size, its the aspect ratio. Width vs diamter of the tire (i think). Or something like that, but its not an actual measurement. if you want a softer ride, go for some 17's, but I think a 245/40/18 on stock suspension would still offer a nice ride.2007 G5 Base Model
Black 5 Speed
Walmart - A store where you can buy a shot gun, ammunition, a ski mask, a baseball bat, a meat cleaver and map of the middle east, but you can't buy a CD that has a "Parental Advisory" sticker.
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Originally posted by jerrodmannmake you slower? please explain.
The only real way to smooth the ride is to go to a smaller wheel with a proper sized tire. Of course I don't notice a harsh ride with my tires, even through Detroit and Chicago.04 CTS-V......like a G6, but with an extra 200hp, a proper transmission, and it is correct wheel drive:
Self described crotchety old man!
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are you guys nuts? 245/40r18 is almost 3/4 in shorter than stock. You will make your sabilitrak and your abs useless. you have up to 1/2" to work with. maybe a 245/45r18 would work but it is still almost 1/2 shorter.6spd silver g6 is my daily driver. love the car too many problems
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Originally posted by 066speedare you guys nuts? 245/40r18 is almost 3/4 in shorter than stock. You will make your sabilitrak and your abs useless. you have up to 1/2" to work with. maybe a 245/45r18 would work but it is still almost 1/2 shorter.
If you have a 245mm section width with an aspect ratio of 45 would be 110.25 mm, or 5mm or about 3/16" smaller in the overall diameter.Black 06 GTP Coupe - Dr. Speed Cold Air Box, Tinted Windows, Projektorz - Coming this week: Grafxworks Pontiac overlays all around, Black Painted Calipers w/ ZZP Decals and Rockblocker Smoked Tail Light Covers !!
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Originally posted by 066speedare you guys nuts? 245/40r18 is almost 3/4 in shorter than stock. You will make your sabilitrak and your abs useless. you have up to 1/2" to work with. maybe a 245/45r18 would work but it is still almost 1/2 shorter.
BTW tire heights:
stock 225/50-18: 26.9"
245/45-18: 26.7"
245/40-18: 25.7"04 CTS-V......like a G6, but with an extra 200hp, a proper transmission, and it is correct wheel drive:
Self described crotchety old man!
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your welcome to your opinion but your wrong. just because you havent had issues you have been lucky. the specs from gm on this are very clear any more than .65 in will disable stabillitrack. your abs will work but not up to gm specs. I would be happy to hook you up with my uncle who is a master tech. also ore you using stock wheels? your tire size is not ment for a 7" rim. they are for an 8.5-9". look it up.6spd silver g6 is my daily driver. love the car too many problems
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Originally posted by 066speedyour welcome to your opinion but your wrong. just because you havent had issues you have been lucky. the specs from gm on this are very clear any more than .65 in will disable stabillitrack. your abs will work but not up to gm specs. I would be happy to hook you up with my uncle who is a master tech. also ore you using stock wheels? your tire size is not ment for a 7" rim. they are for an 8.5-9". look it up.
I would like to call your uncle and talk to him, as his info is clearly not correct, or he is feeding you a line to best "that kid on the internet". Think about it for just a minute. There are zero airspeed sensor on the car. If all 4 wheels are registering the exact same speed, how would the car possibly know that that isn't correct?
BTW techs generally don't have resources like that (the 0.65" rule from above) whereas I do since I actually build the vehicles.
Oh and just because your "facts" piss me off:
My 245/40-18 is supposed to be on a 8-9.5" wheel.
http://www.avontyresusa.com/tires/tech_m550_as.html04 CTS-V......like a G6, but with an extra 200hp, a proper transmission, and it is correct wheel drive:
Self described crotchety old man!
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