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2004 CTS-V
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Discussion Starter #1
I just got my new shoes put on the CTS-V. I'll take some pictures tonight so you guys can see what they look like. I put 245/40/r18's on the front and 275/40/r18's on the back. The rears look amazing from behind the car. I just wish it wasn't sleeting here right now, and that the tire shop's floor hadn't been covered in oil. I haven't had a chance to test these things out yet. My first impression is that I couldn't be happier with the looks, they were perfectly quiet and smooth driving back to the office.

Again, I'll post some pictures tonight.
 

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I'm looking forward to seeing the pics!! I myself will be picking the NT-05s in a couple of weeks..

Cowan
 

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I'll prob be throwing a set of these on as soon as I get my Tax Refund - Thinking of doing the 255/45/18's all around - I like to be able to Rotate my Tires.

* Scratch that - Just looked up the sizing, its either 245/40 or 275/35.... :suspense:

So whats the deal if I do the same setup as T.G. - You just go through the rears faster, and keep the fronts longer??
 

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Discussion Starter #4
Seems to be the case! OMG these look sooooo friggin sweet. The 275's are kind of narrow for 275's; therefore, they don't bulge on the 8.5's like some 275's I've seen do. When I post up the pics tonight, you'll just end up having to go with a staggered setup too....
 

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I like the look of the staggered setup, but I've already toasted my rears well before my fronts, and now I'm running on Stealth V's old Run Craps until the Old Fronts (now rears) wear out - or until my Tax refund gets here.

Is the shorter Tire Height on the rear noticeable? I was trying to stick to at least a 40 for the Rears, just something about running 40's in the front and 35's in the rear seems backwards to me.

Yea Discount Tire is the cheapest I've found online as well - I have a local Tire Guy who has always had unbeatable prices as well.... so I'll have to give him a try.
 

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Why did you go with a much smaller front tire? It probably won't affect your Stabilitrak much, but it could. Did they not have 245/45 or 275/35??
 

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2016 ATS-V (Blk, 6spd, Recaros), 2007 Cadillac CTS-V (sold)
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I like the approach of dropping a series cause i think the stock 245/45's look "fat," but using a tire calc, i get:
245/40/18 sidewall = 3.9"
275/35/18 sidewall = 3.8"
275/40/18 sidewall = 4.3"

wouldn't the 275/35 be the more logical choice for the rears since your speedo would be 0.5% too fast instead of 3.7% too slow?? If you go lowered on 275/40, do you think there would be issues with rubbing ?
 

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I am pretty sure I am going to pull the trigger on these this week as well.

I am thinking of running the following:

Fronts = 245/35r19 = 3.49% smaller or speedo too fast
Rears = 275/30r19 = 4.47% smaller or speedo too fast

I was going to for sure do this until I saw how much different the 275/30 was from stock. I currently run 285/35s and that is just right, but there are two (2) problems

1) These tires don't come in a 285 or 295
2) And I really want to drop down a series in sidewall height for looks purposes

I think I might be back to the drawing board for other tires.
 

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I like the approach of dropping a series cause i think the stock 245/45's look "fat," but using a tire calc, i get:
245/40/18 sidewall = 3.9"
275/35/18 sidewall = 3.8"
275/40/18 sidewall = 4.3"

wouldn't the 275/35 be the more logical choice for the rears since your speedo would be 0.5% too fast instead of 3.7% too slow?? If you go lowered on 275/40, do you think there would be issues with rubbing ?
My 275/40 PS2s ride lowered on Ground Controls. Never rubbed, even on the track...
 

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Discussion Starter #12 (Edited)
I went with the 275/40's because I'm not going to lower my car (It already scraps pulling into my garage w/ my steep driveway) and I don't like having a lot of fender well space. Also, there was a fairly significant price difference between the 275/40's and the 275/35's

I kindof thought a little more sidewall would help absorb the bulge from mounting these on a 8.5 wheel too.
 

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I went with the 275/40's because I'm not going to lower my car (It already scraps pulling into my garage w/ my steep driveway) and I don't like having a lot of fender well space. Also, there was a fairly significant price difference between the 275/40's and the 275/35's

I kindof thought a little more sidewall would help absorb the bulge from mounting these on a 8.5 wheel too.
So you like it soft on the back but harsh in the front??
 

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I am pretty sure I am going to pull the trigger on these this week as well.

I am thinking of running the following:

Fronts = 245/35r19 = 3.49% smaller or speedo too fast
Rears = 275/30r19 = 4.47% smaller or speedo too fast

I was going to for sure do this until I saw how much different the 275/30 was from stock. I currently run 285/35s and that is just right, but there are two (2) problems

1) These tires don't come in a 285 or 295
2) And I really want to drop down a series in sidewall height for looks purposes

I think I might be back to the drawing board for other tires.
There's practically no difference from 285 to 275...
 

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I couldnt find 275/40/18's on Discount Tire's website?? Only 275/35/18's.

Would like to see some pics! Im also Lowered with GC - Not slammed but Dont wanna rub anymore than I already do. I figured dropping from 245/45/18 to 275/40/18 Rear, and 245/40/18 Front might just give me a little bit more clearance.
 

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Again, 245/40F 275/40R is not the best of ideas. Keep them as close as possible F to R...
 

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Discussion Starter #17
Just call discount tire and ask them about the sizes that are available. Had I thought of it, I may have gone with a 275/35 rear, but half an inch isn't going to make that much difference to me. Plus, since I added the maggie and I have a little more weight in the front, the respective spaces between the tires and wheel wells look even as it is with the 40's all the way around.
 

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i like the idea of having a lil more sidewall in the rear than up front for looks purposes.. but i can't imagine this being good for the stability system... maybe its no big deal tho? where's a engineer when u need one
 

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Again, 245/40F 275/40R is not the best of ideas. Keep them as close as possible F to R...
Agreed... I think im going to try and do either the 245/40/18 NT05's all around, or 255/45/18, 255/35/18 Invo's. I would really like to find a good tire at 255/40/18's but all the ones I like (not including Pricey PS2's) are either 45 or 35. Decisions, Decisions.....
 
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