2008-2013 Cadillac CTS General Discussion Discussion, Coupe Winter Tires in Cadillac CTS Second Generation Forum - 2008-2013; I have the 19" summer tire package.I want to purchase a wheel and tire combo,preferably in 19",with winter tires.Tire Rack ...
I have the 19" summer tire package.I want to purchase a wheel and tire combo,preferably in 19",with winter tires.Tire Rack doesn't seem to have the correct specs on the coupe.I wonder if sedan wheels would have the correct offset and back spacing for the coupe.I know that the summer tires are larger on rear than front,but plan on going with same size all around.Probably 245/45x19,which is the size on the front now.
Automobile(s): '09 1SB - Crystal Red w/Light Titanium
Bellevue, WA - USA
Rears bigger than the fronts?
With the "Official Cadillac CTS Coupe" website not giving tire sizes ... I did a search trying to find the tire sizes for the performance package and found this link that says both front and rear are the same (245/45x19) size.
What sizes are on the fronts and rears from the factory with this option?
Thanks for the replies.My stock wheels with the sport package, are 245/45x19 front,275/40x19 rear.I've found the 245/45x19 all around specs listed at many websites,which is obviously wrong.The coupe is claimed to be 2 inches wider in the rear than the sedan.So I'm thinking that using the same size all around may pose a problem.I have yet to find actual wheel specs for the sport package anywhere.The rear wheels are wider than the front.
It was in some auto magazine that I read on the web. Don't recall which one it was. I will check in the next hour or so what the actual offset on the rear wheel is. Should be able to read it with a mirror and flashlight. The offset on the front wheels is 48 mm which I already verified.
Edit: From what I can see using a mirror and reading backwards, The rear is J8X8.5X34
Therefore there is a 14mm difference between the front and back wheels. 14mm ='s ~ .55 inches.
The rim width appears to be the same at 8.5 so you would be able to use 245/45 -19 tires front and rear.
FYI: the specs for a wheel are usually stamped in the inside of a wheel behind a spoke. The more + offset sets the wheel closer to the center of the car. The less + offset sets the wheel further out from the center.
Thanks for the info Zen.I haven't checked on the stamping yet.The rears do appear different from the outside.They also look wider by about an inch.I wouldn't think they would mount a 275 tire on an 8.5 inch wheel.I found some Pirelli winter tires at the Tirerack in the stock 19 inch sizes, but was later told that the 245/45x19's would not be available until the middle of January.No snow yet here in KC,but I think January would be pushing it.My other car is a Corvette so it wouldn't help any.
Called the dealer today,as expected not much help there.The only info they could provide was that the fronts were 19x8.5,the rears 19x9.5.This seems appropriate for the tire sizes 245/45x19 and 275/40x19.They were unable to steer me towards any sources.They didn't seem to have much info on the coupes 18in.wheels either.Unsure where to go next.
I checked my wheels again The stamping on my rear wheel seems to indicate that it is a J8X8.5X48 (not 34 as per previous). However, when I actually measure the wheel it is 1 inch wider than the front. which means it is 9.5 inch wide. The offset is the same on both front and back. Therefore, since the rear wheels are 1 inch wider with the same offset that would mean that the wheel is .5 inch more out from center. Since the tire is also 1 inch wider than the front that would explain another .5 inch outword. Therefore the rear wheels would be 2 inches wider than the front, everything else being equal. Hope this makes some sense.