Winter Tire / Summer tire question
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Cadillac SRX First Generation Forum - 2004 - 2009 Discussion, Winter Tire / Summer tire question in Cadillac SRX Forums; Just purchased a used set of rims ( OEM's) and a buddy of mine sells me his slightly used Winter ...
  1. #1
    Retep's Avatar
    Retep is offline Cadillac Owners Member
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    Winter Tire / Summer tire question

    Just purchased a used set of rims ( OEM's) and a buddy of mine sells me his slightly used Winter tires (Pirelli Scorpio Snow & Ice - came off from a VW Touareg 255/55/18 with less than 10.000 miles).
    Here in Quebec it is mandatory to have winter tires on all 4 wheels (new law starting Dec 15th).

    Presently my 2004 V8 AWD got Michelins (Pilot MXM4 - I think) all season tires on - 2 of them seem to have still good thread on it and the other 2 seem to be almost finished.
    (Don't know how much milage is on any of them, since I bought this car used about 2 weeks ago).
    FWIW - the 255's , which still look decent are mounted in the front and the 235's (shabby) are mounted in the rear. .

    I was reading some opinions here on the forum ( ) about those Michelins and it seems most people don't like them too much anyways.

    OK - my question is the following : Should I dump all Michelins come next spring and get summer tires instead of all season tires ?

    Am I right in my assumption that a summer tire will last longer than a all -season tire ?

    Thanks in advance

    Peter

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  3. #2
    PbPedis is offline Cadillac Owners Member
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    Re: Winter Tire / Summer tire question

    Summer tires are formulated to give you more grip which generally means shorter life. If you look at ultra high performance tires, their lifespan is usually very short. I would stick with all seasons because if you ever get caught in an early fall or late spring snowstorm with summer tires on, you may as well park your car as it is dangerous, even with AWD.

  4. #3
    john d is offline Cadillac Owners Enthusiast
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    Re: Winter Tire / Summer tire question

    [quote=Retep;1628928] FWIW - the 255's , which still look decent are mounted in the front and the 235's (shabby) are mounted in the rear. .

    another reason to dump the whole car....fronts should be on back and vice-versa. Someone rotated the tires...a big no, no.
    more proof that it's been screwed with beyond belief!

  5. #4
    Northern SRX's Avatar
    Northern SRX is offline Cadillac Owners Enthusiast
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    Re: Winter Tire / Summer tire question

    Retep,

    Yeah, it appears that somebody rotated those tars of yours when they shouldn't have. Cadillac recommends against it. Not the end of the world but the 235s should go up front and the 255s in the back. Some move to 255s all around - which is what you're doing for the winter. Frankly, the winter ride benefits from a narrower tire up front but you did get a deal. And, let's face it, Cadillac engineers calculated that the vehicle handled best with 235s up front and 255s out back. Others will argue but I've so far stuck with that set-up.

    I don't find the Pilots awful in the summer but they aren't so great in April and October-November when cold weather can be a problem in our climes. I have 2 sets of wheels and put the Pilots on in early-mid May and take them off in late October to early November. The rest of the time, I used a set of Nokian WRs which work very well.

    You'll find that the size of tire seriously limits your choice of tires but the summer and all-season range is better than the winter ones - or so it used to be.

  6. #5
    robhersch is offline Cadillac Owners Enthusiast
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    Re: Winter Tire / Summer tire question

    Quote Originally Posted by Northern SRX View Post
    Retep, Yeah, it appears that somebody rotated those tars of yours when they shouldn't have. Cadillac recommends against it. Not the end of the world but the 235s should go up front and the 255s in the back. Some move to 255s all around .................. And, let's face it, Cadillac engineers calculated that the vehicle handled best with 235s up front and 255s out back. Others will argue but I've so far stuck with that set-up............
    You'll find that the size of tire seriously limits your choice of tires but the summer and all-season range is better than the winter ones - or so it used to be.
    I originally agreed that Cad engrs selected 235/60-18 (F) and 255/55 (R) probably for a variety of reasons including the german testing; but we found that the 235 OEM Michlins on our 2005 SRX N*V8 RWD wore faster on both inner & outer edges. We not only monitored pressure, had nitrogen added, had alignments from both our Cad dealer and a highly rep independent alignment shop to calibrate our tire wear under our driving.

    We would prefer to replace all 4 with same size; and as an experiment, we "rotated F>R, R>F" to check wear, turning interference, handling (our typical driving), ride, etc. We find (for us) insignificant differences with the 235s rear and 255s front - except that the 255/55s are wearing much more evenly than the 235/60s on the front of our SRX!!!!

    Technical Data from Tire Rack -- NOTE below:
    Specs: 18"OEM Michelin 18"GoodYearEagleRespEdge 20"OEM GY RS/A
    Size: 235/60 255/55 235/60 255/55 255/50
    Max LD: 1874 1984 1929 2039 1984
    Sect Wd: 9.5 10.4 9.4 10.4 10.4
    Tread Wd: na na 8.1 8.7 8.6
    Dia: 29 29 29.1 29 30.1
    Revs/Mi: 723 717 718 720 690
    UTQG: 300AA 300AA 440AA 440AA 260AA

    Our conclusions from tech data, our experiment, and Tire Rack surveys :
    1) 2008 SRX Sport Model went to same 20" size on all 4 wheels (does the sport model suffer from degraded handling or does the sport model have unique suspension or steering parts - with normal SRX suspension ??)
    2) 255/50-20 almost identical to 255/55-18 except for dia, revs/mi (0.434% speedo error)
    3) Cad cannot claim 255/55-18s on all 4 has more warranty liability than 255/50-20 on all 4
    4) We found no rubbing or other interference on front end or steering.
    5) Replacing all 4 tires with 255/55-18 allows normal tire rotation to distribute wear patterns
    6) Replacing all 4 OEM Michelins with 4 - 255/55-18 GoodYear Eagle Response Edge makes practical sense!!
    Good luck with your solution.

    We still love our SRX and we would again select SRX over all others we drive tested !!

  7. #6
    Northern SRX's Avatar
    Northern SRX is offline Cadillac Owners Enthusiast
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    Re: Winter Tire / Summer tire question

    Quote Originally Posted by robhersch View Post
    I originally agreed that Cad engrs selected 235/60-18 (F) and 255/55 (R) probably for a variety of reasons including the german testing; but we found that the 235 OEM Michlins on our 2005 SRX N*V8 RWD wore faster on both inner & outer edges. We not only monitored pressure, had nitrogen added, had alignments from both our Cad dealer and a highly rep independent alignment shop to calibrate our tire wear under our driving.

    We would prefer to replace all 4 with same size; and as an experiment, we "rotated F>R, R>F" to check wear, turning interference, handling (our typical driving), ride, etc. We find (for us) insignificant differences with the 235s rear and 255s front - except that the 255/55s are wearing much more evenly than the 235/60s on the front of our SRX!!!!

    Technical Data from Tire Rack -- NOTE below:
    Specs: 18"OEM Michelin 18"GoodYearEagleRespEdge 20"OEM GY RS/A
    Size: 235/60 255/55 235/60 255/55 255/50
    Max LD: 1874 1984 1929 2039 1984
    Sect Wd: 9.5 10.4 9.4 10.4 10.4
    Tread Wd: na na 8.1 8.7 8.6
    Dia: 29 29 29.1 29 30.1
    Revs/Mi: 723 717 718 720 690
    UTQG: 300AA 300AA 440AA 440AA 260AA

    Our conclusions from tech data, our experiment, and Tire Rack surveys :
    1) 2008 SRX Sport Model went to same 20" size on all 4 wheels (does the sport model suffer from degraded handling or does the sport model have unique suspension or steering parts - with normal SRX suspension ??)
    2) 255/50-20 almost identical to 255/55-18 except for dia, revs/mi (0.434% speedo error)
    3) Cad cannot claim 255/55-18s on all 4 has more warranty liability than 255/50-20 on all 4
    4) We found no rubbing or other interference on front end or steering.
    5) Replacing all 4 tires with 255/55-18 allows normal tire rotation to distribute wear patterns
    6) Replacing all 4 OEM Michelins with 4 - 255/55-18 GoodYear Eagle Response Edge makes practical sense!!
    Good luck with your solution.

    We still love our SRX and we would again select SRX over all others we drive tested !!
    I agree with the benefits of going 255s front and back for the summer but I was actually making reference to winter driving when, in principle, a narrower tire up front provides better traction and better handling while braking in encounters with loose snow or cold/gelled slush. I will concede, though, that by the time you're in the 235-255 territory, you're already into a pretty wide territory and the difference might not be astounding. Still, I'll take any edge I can as I encounter these conditions relatively frequently in our winters.

    On the summer tire front, I won't argue the point as I am not dogmatic about this - I replaced the OEM tires at roughly 20k miles with another set of OEMs more because I got them for virtually nothing (they came with the 2nd set of rims that I bought for $800 and tires and rims had ~20 miles on them) than because I liked the tires or staggered set-up. Yes, I would have preferred same size all around for rotating - as you say - but I also recognize the rule of thumb that the larger the contact patch up front, the more sluggish the steering will be. However, there are many SRX owners who switched to 255s up front who say that they don't notice a difference in ride or steering and, since I haven't done the experiment, I have a weak voice on that matter.

    But, what I will say (again, from what I've read) is that going with 255s all around will give you a noticeable improvement in tread life and the price you pay for that advantage appears to be an insignicant difference in handling.

    Still, for winter driving, I'm going to stubbornly stick with the narrower contact patch.

  8. #7
    z32drifter's Avatar
    z32drifter is offline Cadillac Owners Member
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    Re: Winter Tire / Summer tire question

    I'm still not sure of Cadillacs logic with staggered tires on the same size wheels. Our fronts were toast around 38k but the rears are still about 30%, I replaced the fronts with a used pair of 255s (can't beat free). I can't tell a diff in steering feel or ride. I will replace the current miss-matched set with summer tires in the future. We don't have to worry about snow here in Florida so I'm going with the 255s all around. One advantage of the summer tires is the "rim protector" built into the side wall, that and the larger 255should help my wife avoid grinding the wheels on curbs when parking.

  9. #8
    conedoctor is offline Cadillac Owners Connoisseur
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    Re: Winter Tire / Summer tire question

    More front grip in the winter is bad, you don't want overstreer.

    Now not that 20mm is really going to do that.

    I use 235 all the way around for winter, Kumho KW19 (studded) and Continental Crosscontact UHP in a 255 all the way around for summer.

    I am supper happy with the setup and the Conti's have been great so far.

    Many people disagree but all season tires suck, the end. You don't wear boots to play tennis and you don't wear flip flops to play in the snow. If you live where you get snow and sun you need two sets of tires, fine if you live in Vancouver but Calgary not so much.

    Once again I don't care to fight about it.

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