19" CTS-V Wheels on a CTS AWD Coupe... HELP!!!! - Page 4
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2008-2013 Cadillac CTS Appearance Mods Discussion, 19" CTS-V Wheels on a CTS AWD Coupe... HELP!!!! in Cadillac CTS Second Generation Forum - 2008-2013; Originally Posted by rockryno they should. you could even go front coupe wheels. its the coupe rears with the 40mm ...
  1. #46
    Char T A's Avatar
    Char T A is offline Cadillac Owners Fanatic
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    Quote Originally Posted by rockryno
    they should. you could even go front coupe wheels. its the coupe rears with the 40mm offset that are the problems.
    I would agree. Here is mine with a 10" wide wheel and +45. I wouldn't attempt another 5 mm, she is right flush at +45! http://www.customwheeloffset.com/whe...ck-custom-rims

  2. #47
    JoeEXT's Avatar
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    Re: 19" CTS-V Wheels on a CTS AWD Coupe... HELP!!!!

    Quote Originally Posted by Jon View Post
    What's the risk of running the stock V tires? 255/40/19 and 285/35/19? It has a 5.1 rev/mile difference with the bias towards the rear.
    Any tech guys out there that have an opinion on this? I am still a little nervous about this although no drivability issues so far.
    Anyone want to buy the 2 fronts (Pilot Sport PS2 255/40/19 with 1100 miles on them)

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    Re: 19" CTS-V Wheels on a CTS AWD Coupe... HELP!!!!

    Quote Originally Posted by rockryno View Post
    they should. you could even go front coupe wheels. its the coupe rears with the 40mm offset that are the problems.
    Would the coup V rears fit a RWD sedan better than an AWD sedan?

  4. #49
    akamai43 is offline Cadillac Owners Member
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    Quote Originally Posted by EDMAN
    Close up.<img src="http://www.cadillacforums.com/forums/attachment.php?attachmentid=90820"/>
    Love those wheels.

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    hwood is offline Cadillac Owners Member
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    Re: 19" CTS-V Wheels on a CTS AWD Coupe... HELP!!!!

    HELP QUICK, I just bought my wife an 10 awd wagon, it has factory 18s, I can purchase a set of 09 ctsv wheels off a sedan am I going to have ANY problems???????? what EXACT tire size do I need to run.... please help fast the guy is only holding wheels for a day

  6. #51
    JoeEXT's Avatar
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    I just did the same on my sedan. You will need to swap out the front tires with 245/40/19 to get the size just about the same as the rear....car looks so much better with those rims!!!!

  7. #52
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    Re: 19" CTS-V Wheels on a CTS AWD Coupe... HELP!!!!

    Quote Originally Posted by FDU243 View Post
    I do not believe those tires conserve the same front/rear rev per mile bias that the 18" rims have... Stock AWD's have a 4 revs per mile bias to the front wheels. 245/40/19 and 285/35/19 conserves the AWD bias to the front...

    Front 245/40/19
    Sidewall: 3.9in
    Radius: 13.4in
    Diameter: 26.7in
    Circumference: 83.9in
    Revs/mile: 755

    Rear 285/35/19
    Sidewall: 3.9in
    Radius: 13.4in
    Diameter:26.9in
    Circumference: 83.9in
    Revs/mile: 751

    -------------------

    Front 245/45/19
    Sidewall: 4.3in
    Radius: 13.8in
    Diameter: 27.7in
    Circumference: 87.0in
    Revs/mile: 729

    Rear 275/40/19
    Sidewall: 4.3in
    Radius: 13.8in
    Diameter:27.7in
    Circumference: 86.9in
    Revs/mile: 729
    This isn't exactly correct. The math above assumes the tire maintains its diameter. Tires will compress a bit under weight, and this changes the "effective" diameter and thus, the actual revs per mile. So even with identical tires front and rear, there will be a difference in revs per mile due to the difference in weight distribution.

    Tire rack has an article on this with a much better explanation:
    http://www.tirerack.com/tires/tirete...jsp?techid=203

    So, all that being said, I don't know what effect you'll have by putting different tire widths/diameters on an AWD car. I assume there's a differential for Front/Rear, so a small difference in revs per mile shouldn't be too big of a deal. But, as with anything you do on your car, be sure of what you do before you do it. And for warranty purposes, maybe keep your stock wheels and tires so you can put them back on before going to the dealershaft in case there's any transmission problems down the road.

  8. #53
    tinman's Avatar
    tinman is online now Cadillac Owners Connoisseur
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    Re: 19" CTS-V Wheels on a CTS AWD Coupe... HELP!!!!

    Dealershaft/stealership...what's the difference?

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