245/45-17 on Stock '04 RIMS, Do they fit?
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Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, 245/45-17 on Stock '04 RIMS, Do they fit? in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; I wanted to upsize the stock 225/50-17's to 245/45-17's (same diameter, 20mm wider). The tire specs show sidewall to sidewall ...
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    markab130 is offline Cadillac Owners Member
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    245/45-17 on Stock '04 RIMS, Do they fit?

    I wanted to upsize the stock 225/50-17's to 245/45-17's (same diameter, 20mm wider). The tire specs show sidewall to sidewall is about 1/2 inch wider, so about a 1/4 inch more inside and out. The front steering knuckle is VERY close to the stock tire/wheel at the top. Has anyone fitted these tires to this combination yet? How close are they really going to end up?

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    Franchise2005 is offline Cadillac Owners Fanatic
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    Re: 245/45-17 on Stock '04 RIMS, Do they fit?

    i havent trued it yet but i tihnk it will be rubbing like a mofo but u can try it and tell me what goes down cause that seems like a good idea

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    Re: 245/45-17 on Stock '04 RIMS, Do they fit?

    Franchise.... Do you even read what you type???

    Mark - have you measured? 1/4" is not a lot, and I looked at what you meant - it is quite close (though I did not have a tape with me when I was looking, either).

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    Re: 245/45-17 on Stock '04 RIMS, Do they fit?

    [QUOTE=HammerG26]Franchise.... Do you even read what you type???
    QUOTE]

    I think Franchise is like Crockone. His fingers type faster than his brain

    You could also roll your wheel well lips if you get some minor rubbing. I have 245/45/18 and no rubbing.

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    Re: 245/45-17 on Stock '04 RIMS, Do they fit?

    A 245 tire is 20mm wider than a 225. That's 10mm on each side. If you stick your hand behind the top of the wheel, you'll see you have less than a finger's thickness of clearance (~10mm). It would be VERY close with the stock offset wheels (51mm ET). Most folks running 245's have switched to wheels running between 40 and 44mm offset. Stock V is 42mm.

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    markab130 is offline Cadillac Owners Member
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    Re: 245/45-17 on Stock '04 RIMS, Do they fit?

    Yeah, that's what I did, that's what got me wondering if 10mm on a 7.5 inch wide rim instead of the 8.0 inch rim in the tire specs was just enough to get by...

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    Re: 245/45-17 on Stock '04 RIMS, Do they fit?

    You might get by with spacer plates and rolling the lip.

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    Re: 245/45-17 on Stock '04 RIMS, Do they fit?

    Quote Originally Posted by dkozloski
    You might get by with spacer plates and rolling the lip.
    Dave,
    What are your thoughts on spacers? Don't they deprive you of some thread for the lug nuts

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    markab130 is offline Cadillac Owners Member
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    Re: 245/45-17 on Stock '04 RIMS, Do they fit?

    I wouldn't do spacers, it loads the threads of the studs if there isn't enough hub engagement. You need at least 3 threads minimum as rule past any nut. The fender lips aren't the problem, the rim and tire are right up aginst the upper front steering knuckle with about 1/4" of clearance. Put your hand up behind the top of the tire and you'll see what I'm talking about. I really didn't want to go to a new rim and offset, but if I did, the 40mm would fill out the wheelwells nicely, then I'd need to choose a good +1 diameter like the 18's (or +2,+3).

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    Re: 245/45-17 on Stock '04 RIMS, Do they fit?

    Rules for aircraft is one full thread past the nut. Use the minimum spacer that will give you some clearance and you should be okay. If you are using crown nuts be sure you have 1 1/2 diameters of thread engagement minimum.

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