Cadillac CTS-V 2004-2007 (Gen I) The Caddy with an Attitude...

WHeel sizing?

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Old 01-05-2010, 11:14 PM
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Default WHeel sizing?

So i got my hub question answered now for wheels....will a 18x9.5 with a 275/35/18 in the front and a 19x10 with a 315/30/19 rear fit with no MAJOR mods? I dont mind rolling a lip or two but not really ready to do a mini tub yet.
Old 01-05-2010, 11:26 PM
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i feel like i read a thread on cadillacforums about someone who was trying to push it with thier rear wheel width. I dont know what exact specs were involved, but look over there or maybe do a search. I know you said no "major" mods to do it, but I would love to see someone get those spectre "wheel flares" and actually get a offset/width that fits them flush. I remember "chef's" old car had them with KDW's but the sat waay inside the wheel arch. Let me know what you find out.

-morgan
Old 01-05-2010, 11:38 PM
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I don't think at 9.5 up front will fit. I could be wrong though. And a 315 in the rear will be cutting it close with the rear control arm not being modified. I think the widest I've ever heard of out back was a 285, perhaps a 295.

I'd love to see it happen though and sorry I'm not too much help
Old 01-06-2010, 12:02 AM
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i doubt this stup will work front or back, the front are damn close ont he stock wheels and tires to hitting the wheel wells and the rears at 275 start to bulge out from the fenders. id stick to a 275 out back and a best 255 up front. the thinner sidewall will offset the wider tire anyways.
Old 01-06-2010, 09:08 AM
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you will not fit 315s in the rear of our car without serious modification to the fenders, and by that i mean flares, not just rolling/pulling.

i run 285s in the rear and i'm as flush as can be, and that's with rolled fenders and a custom 3 peice 10.5 wheel with very aggressive measurements.
Old 01-06-2010, 07:03 PM
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I run 295 Toyo R888 r-comps in the rear. I'm lowered (not too much, would like to go a bit lower) and with 19"x10" rear wheels the tires bulge a bit on the wheel but I do not get any sort of rubbing on the street at my current ride height. I do get slight (OK, maybe moderate) rubbing on the road course with the current set-up. If you want to run 295s in the back, you are definitely going to have to sacrifice some sidewall height and go with a 30 series tire. Looking at the pictures, keep in mind that the car is lowered at least 1" all around, but the tires have such a narrow sidewall that it makes the car look higher. As a point of reference, the overall diameter of the wheel and tire is approximately 0.70" shorter than the stock wheel/tire combo. That means the OD of the tires alone lowered the car almost 1" + however much lower the body of the car is due to the Eibach lowering springs.
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Last edited by tweeter81; 01-06-2010 at 07:11 PM.
Old 01-06-2010, 08:06 PM
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I ran a 295/35-20 in the rear for a little while. I had to raise the rear up to almost stock height just to hope not to rub hitting anything. The sidewall height on my 295's were 4", yours would be roughly 3.75". Now the 295's were about as wide as I could run without hitting the rear control arm. That was with a 5mm spacer, and 10.5" custom built wheels. Ended up with a mean little rake, hotrodding around. Ended up taking them off and going back with the 275's for a more sleek look.
Old 01-06-2010, 10:11 PM
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275/35/18 - you will need spacers, and they will still rub (on stockers) But they can be made to work with GC kits. Ive heard of 265's fitting w/out any work needed.

i have 275's on the stock rim in the back and they are REAL close to bulging out.
Old 01-07-2010, 01:21 PM
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295s are max on rear, unless you start cutting and welding, or opt for the Spectre flare kit. These is no room, your inside tire wall is almost touching the trailing arm. I have run two sets of PS2s 295s on rear, maybe 10K on each, and they stick out a hair or two outside the panel on CCW 10" SP 600s, no way can you get more meat back there. With that said, the 295s rub on occasion on my non-lowered V, like if my two Samoan sisters-in-law need a ride to their wrestling event. I have considered going 285r, but am not willing to turn in my Man Card.
If you go with Spectre it ain't cheap, and they recommend only a Top Tier Bodyshop doing the install. Chef is the only person I know who did this, and I will say it looked AWESOME, although he bought some UberCrap after he parted with the V, he is still a good dude.
Old 01-07-2010, 03:24 PM
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Originally Posted by onebadcad
295s are max on rear, , no way can you get more meat back there. my two Samoan sisters-in-law need a ride to their wrestling event, but am not willing to turn in my Man Card.
295 . . what? 30, 35, ? 18s or 19s. What's the overall diameter of your wheel/tire combo. I'm envious of the big 10in CCWs.
Sounds like you have a 'unique' ride . . . and when you mention the "meat in the back", are you talkin' - rubber or Samoan Babes and do they know your packin' a 'man card'. Send picture of Samoan Babes . . . please!
Old 01-07-2010, 05:22 PM
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The 295s are Mich PS2s 295/30/19. Regarding the womenfolk, check my avatar, there are the Lesbian flight attendents that moved in next door to me about six months ago. They allow me to photograph their home exploits, I have posted their pics in another thread, just cannot find it at this time,,,
The Samoan babes were only in the V once, after a complete suspension overhaul I decided it was not worth the money.
Old 01-08-2010, 08:41 AM
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Originally Posted by onebadcad
Regarding the womenfolk, check my avatar, there are the Lesbian flight attendents that moved in next door to me about six months ago. They allow me to photograph their home exploits.
..

win
Old 01-10-2010, 09:57 PM
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I have 265-40-18 on all 4 corners on stock rims with a little rubbing on tight turns up front and NO issues in the rear. I've also had 275-40-18 on the rears - stock rims - with no rubbing but did have bulging.

If you plan to use the stock rims I wouldn't go more than 255-45-18's or the stock 245-45-18's up front. On the rear, you can go to 275-40-18 for a no budge fit on a widened stock wheel to 9.25" ... which by the way are perfectly matched with the 245-45-18's up front for overall diameter. You won't need spacers or a modified hub.

Actually, I have a pair of wheels that Eric Vaughn Machine in Monrovia, CA (626-358-6413, www.ericvaughnmachine.com) is widening to 9.25" in order to fit a pair of 275-40-18 tires on the rear. The wheels were bent on the inside rim bead and needed to be fixed anyway. He charges $300/wheel + return shipping. With his process, he is cutting off the inner beads of my wheels and replacing them with new ones with one weld seam - very clean and true. He can widen wheels to whatever size you want but the limit for our vehicles on the rear is 9.3" from what I've read.

Once I have these wheels and tires installed on the rears, I'll be waiting for my 265-40-18's up front to wear out and I'll probably go with the stock size up front @ 245-45-18 or possibly 255-45-18's.

Good luck in your decision process.
Old 01-16-2010, 09:53 PM
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Update on my setup ...

I got my widened stock wheels from Eric Vaughn Machine shop ... he did a great job by the way and both were right at 9.25" as per my order.

After I fit the wheels I noticed that the passenger side exhibited a bit of metal on metal noise - nothing major - when going over bumps and during hard turns. I didn't hear anything from the driver side rear. I removed both rear wheels and noticed a slight rub between the inner wheel and the lower trailing arm. All other gaps were fine. Instead of using a wheel spacer which isn't safe in my opnion, I decided to grind 2mm of material about 1 inch long centered at the point of wear. I checked the driver side and found no wear marks on either the wheel or the trailing arm but decided to grind away 1.5mm of material from that side also.

I test drove the car and everything is fine now.

BTW - the tires I decided to switch to for the rear are 275-40-18 Continental ContiExtremeContact DWS's. They have a 50K mile warranty and I got them from Discount Tire for $211 each. When the 265-40-18 front tires wear out I'll probably go with the Continental (if the rears turn out to be good tires) but stock size @ 245-45-18's or 255-45-18's.
Old 01-16-2010, 10:06 PM
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Originally Posted by onebadcad
The 295s are Mich PS2s 295/30/19. Regarding the womenfolk, check my avatar, there are the Lesbian flight attendents that moved in next door to me about six months ago. They allow me to photograph their home exploits, I have posted their pics in another thread, just cannot find it at this time,,,
The Samoan babes were only in the V once, after a complete suspension overhaul I decided it was not worth the money.
Still peddling that story huh?
Old 01-17-2010, 05:03 PM
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What's the max tire size on the rear stock rims again?
Old 01-17-2010, 08:07 PM
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With a stock height, you can fit 275-40-18's on the rears on stock rims but the look is a bit bulged out. I've had this set up on my car with no rubbing issues ... even with the larger fit Michelin and Goodyear tires. For 275's to fit right you need at least a 9" wide rim.

Up front I've put on 265-40-18's with a little bit of rub. I wouldn't go larger than 255-45-18's.
Old 01-17-2010, 08:19 PM
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skinnier and stickier over a wide all season tire any day! i run 255/40 falken rt615s all 4 corners, lowered 1.5 front, 2 rear. no issues, tires stick nicely nothing gets torn up!
Old 01-17-2010, 08:49 PM
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I ran 295's on my CCW's with my old car and it was a perfect fit, never rubbed at all
Old 01-17-2010, 09:16 PM
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Originally Posted by y2kfrc
I ran 295's on my CCW's with my old car and it was a perfect fit, never rubbed at all
What size CCWs. 18" or 19" and the width of the wheel? And tire Mfg.
thanks


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