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Cadillac CTS-V (2006)
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Discussion Starter #1
Re: sts v wheels on cts v?

I did it! Got a set of STS-V rims/tires onto a CTS-V w/o any clearance or other issues. They look GREAT! I can tell, but to 5-0 they'll look pretty stock.

But man, what a b-i-t-c-h of a project it was to get sorted out. Had to get special spacers made and had to special order long studs from GM racing for the conversion.

Can give part numbers & specs to anyone who'd like to do the same conversion.

So far it seems worth it. They look WAY better than the red CTS-V w/STS-V rims pictured in this thread (will post pix in a day or so). They fill the wheel wells out nicely.

Also, the car rides so much more smoothly. Really seems to help real world driving. I think the slightly taller sidewall (they're 255/45s up front and 275/40s in back) helped the ride & ability to hold over uneven pavement slightly.

On pure numbers, ultimate adhesion may be down a tad (maxes out at like 0.96 now where I used to hit 1.05 regularly). But, I think its an alignment issue & some. Getting that taken care of Friday at a specialty racing alignment shop nearby.

Accelleration 0-60 seems slower by half sec or so, but for some reason 1/8th mile time/speed seems to have improved (based on a quick, hot day test using an Escort GT-3 Timer). Definitely getting better launches and have traction to spare for that Maggie I secretly lust for when the squeeze isn't paying attention.

Matt S.
P.S. Thanks for your input James. Gave me the courage to at least give it a try.
 

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Cadillac CTS-V (2006)
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Discussion Starter #3
Thanks. Here's a few pix (yeah, my car needs washing I know).

Anyone know how to recalibrate the speedo? Also, I guess need to know whether the speedo is tied into the front wheels or back wheels -- if its the fronts, I can leave it alone & just switch tires back to the original size at some point since they'll have the same diameter as before....
 

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CTS-V SERIES
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I looks good. Its a different type of good =)But that front tire looks as it will hit when you hit a bump. ?? hows it riding?
 

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1996 Eldorado Sport Coupe, 2009 Black Navigator
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Looks pretty good but as 1QUICKV said you better watch out for those in & out ramps at the supermaket/gas stations.
 

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Cadillac CTS-V (2006)
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Discussion Starter #7
Lol. They're fine. Right now, it'll touch if I go like 35+ over a particularly tall speedbump near my house. Did that a couple times when I did shakedown runs - no rubber off on wheelwell/fender & zero damage.

Folks, I drive this car like I stole it all day every day. On the old stock Eagle RS's, I was pulling 1.05 to 1.09g's every day at three places in my commute.

I can't stand cars with issues, rattles, shakes, weird noises etc. etc. I'm a recovering Porsche "freak". (Gave up pouring $ into my 928 S4 keeping it perfect & parked it when I bought the V to replace my daily driver, which was a pre-Bangle 740i.)

Even so, the speedbump thing doesn't bother me one whit b/c I don't like bashing up the car on speedbumps anyway (the rear shocks won't take that -- already broke one last year, so I quit driving like an idiot over them).

Not only is the clearance fine in HARD driving, but the improvement in ride quality is amazing -- I just can't begin to articulate how much smoother it rides over "city" pavement than before. The ONLY thing I don't like is it is understeering a bit and isn't turning in quite as easily as on the shorter sidewall OEM tires/rims -- but, it needed an alignment before the swap & I'm going to have them use an aggressive set up to compensate for the wider track and offset wheel sizes.

Its wearing the STS-V's Pirelli 255/45/18's up front. With a switch back to the original Goodyear RS 245/45/18 front tires (they'll fit that rim) or a switch to a 255/40/18 down the line, even that issue would go away. But it looks closer than it is.
 

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2010 Cadillac CTS-V
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268 Posts
I like it. Can you do a shot rear angle low showing the tire width in back? Also, give the details on the spacers and studs.
 

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Cadillac CTS-V (2006)
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Discussion Starter #9
Also, there's ZERO shimmy with this set up -- or I can attest it doesn't shimmy up to a buck twenty +/-.

Went through like ten sets of different size/design spacers to get it right. Originally, I had straight, flat six-lug spacers made. I took it to a local specialty shop, which I chose to do the install because of their reputation as experts for wheel swaps for racing. They warned me not to try it with those because the one needed up front left the hub flush with the spacer. So, I went back to the drawing board. In then end, to get it right, I had four custom hub-centric spacers made (with different sizes for front and back) to ensure that & it was worth it.
 

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ZIP
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Those certainly don't look like 275 width tires in the back. As for ride, that's all on the tires. Whether you have funky wheels with radical spacers or not, your rubber is in the same place as everybody else. As for no shimmy, luck of the draw...
 

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I usually don't like digging up zombie threads, but this one is pretty cool, and I hope the OP becomes active on the forum again, because if I buy a CTS-V, this is something i'd definitely like to do... Except i'd get the rims powdercoated Corvette Competition Grey, regardless of if they were on a silver or black V.
 

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2005 CTS-V, Black
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He's still around I think. I met him at the most recent V-day (track day hosted by Lindsay Cadillac). Nice guy. Haven't seen him on the forums very often though. Contribute to the site so you can PM and PM him.
 
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