Here are the specs i got for the Cadillac cts-v race car

Front = 18" rims with 275/35/18
Rear = 18" rims with 335/30/18

 

I said MOST, not a Caddy. Do you not understand the meaning of MOST? Do you race yourself? Doubtful.

 

The diameter remains constant.

The tire choice and rim material is the key. Unsprung weight affects the car's performance far more than you know. After doing a quick research, stock Mich pilot sport is 24 and 26 lbs front and rear, while the the mich pilot sport ps2s are the lightest at 23 and 25 lbs respectively. That one pound per tire makes a whole lot of difference. Now to make it even faster, consider smaller rims and/or lighter material like Magnesium.

 

The factory 18s, being cast are indeed heavier than the oem FORGED 19s.

 

Obviously you haven't done your research.

The 19" weight 50-52lb. The 18" 05+ G35 Sedan rims weigh 49lb each.

This was measured a while back. FYI.

https://g35driver.com/forums/showthr...t=wheel+weight

Forged because its 19, but its not lighter than the 18" models.

 

Diameter might be true, but the overall mass is larger due to metal vs rubber. The bigger the wheel, the less performance you get.

Why do you think the 350z comes with smaller wheels on the performance models? lol.

 

You clearly don't understand the stuff you type. You said WHEELS. I said WHEELS. Not wheels AND tires. You assume that people will be running the tires that come oem. They of course can run any tire they wish.

Also from what I remember the G18s wont' be exactly same weight front/ rear. As the rear 245s are heavier than the fronts 225s. The 19" re050s are heavier than the 18" michelin pilots.

You are also weighing the sedan 18s which are different than the coupe 18s.

You need to SPECIFY which 18s you are talking about. Also your Goodyear NCTs are only a Grand Touring all seasons. Hardly in the same performance category as a Michelin pilot or a Bridgestone re050. Performance tires are often heavier because of the stiff sidewalls required for better performance.

IMHO the coupe 18s vs the coupe 19s w/ tires seem to be a better heads up comparison as they both feature a staggered 225/245 tire. Although the 19s are at a disadvantage as they are 0.5" wider in the rear than the coupe 18s rear wheel. They also feature performance tires vs all seasons.

 

I'm replying to YOUR statement and asking you to quantify those very GENERAL statements. If you don't want the subjec to get off topic then don't make off topic statements.

 

So lets do some math.

18" Sedan wheels 2005+.

Tire weight 26lb each. 26-49= 23lb a wheel which is fairly light.

Coupe 19"

Tire weighs 21lb and 26lb for Michelins. 21 - 50lb = 29 front and 34 rear for wheel weight.

Since the Michelins are the factory tires and shows you the wheels weigh a lot for forged wheels.

The tires per tirerack:

27lb for the RE050A 225x40x19
30lb for the RE050A 245x40x19

21lb for the Pilot Sport in 225x40x19
26lb for the Pilot Sport in 245x40x19

26lb for the GY NCT5 on the Sedan Sport 18" 235x45x18

24lb for the Pilot Sport 225x45x18
26lb for the Pilot Sport 245x45x18

 

I see your not making friends as usual.

 

Um 50-27 = 23lbs and 52-31 = 21lbs. The factory tire for the 19s are the RE050s, not the Michelins.

You research shows the coupe factory forged 19s are actually very light for a 19 x8 / 19x8.5 wheel. LOL

Taken from your thread:

49 - 24 = 25lbs. Coupe front - Michelin tire
50 - 26 = 24lbs. Coupe rear - Michelin tire

This shows despite the tires being anywhere from 3lbs to 6lbs LIGHTER, the total package is no lighter than the coupe 19s on oem tires. So that means what?

 

Yes, his friendship would be teh pinnacle of my existance. I can do my own typos, thanks

 

Dont get pi$$ed man, i was going to post it in my frist post as an "edit", but you responded before i could look up the specs so i figured you wouldnt see my edit thats why i posted the new post. Yes, my father raced formula mazdas for years...now my cus and his brother race formula mazdas in the scca...so im at the track alot more than you are probably. Dont get pissed if i posted something just so you could see the specs.

Thats also not just the cadillac, go to any other scca speed world challenge car websites and look at their tire specs, their all atleast a profile of 35 or smaller (atleast in the GT class).

-sean

 

My bad, so Micehlins are the factory tire. Okay, 21 and 23 still not bad. About the same weight as the Sedan 18" wheels like I said.

 

Sure. Yea, a lot of these racers use low profile ghetto style tires for racing. LOL! If that was true, then you would see Indy cars or Nascar with really low profile tires and a large wheel.

You just proved you know nothing about racing. Again, why do MOST have larger sidewalls? WHY? I said why.