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Discussion Starter #1
Can someone please confirm that my CTS (2004 model) with 17" wheels should have come from the factory with 225/50/17 tires? I haven't looked in the manual yet (not in front of me), so go easy...
 

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Black the Darkside
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2004CTS said:
Can someone please confirm that my CTS (2004 model) with 17" wheels should have come from the factory with 225/50/17 tires? I haven't looked in the manual yet (not in front of me), so go easy...
Memory tells me its 225/55/17 but then you may be right. My '04 came with 17" tires.
 

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Discussion Starter #3

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Solved! I thought profile of my tires appeared too tall when I bought the car and even said something to the salesman. Turns out they put on 235/55/17 tires. Just called them and they said no problem at all, bring it in and they'll change them. :cool2:
 

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235/50R17's would be fine (26.25" diameter) but the 55 series might be a tad too big (27.18" diameter) but would fill the wheelwells nicely. Stock is 225/50R17 (25.85" dia) and the V has 245/45R18's (26.68" dia). If you keep the diameter between stock and the V, you'll be fine.
 

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Discussion Starter #8
odysseus said:
235/50R17's would be fine (26.25" diameter) but the 55 series might be a tad too big (27.18" diameter) but would fill the wheelwells nicely. Stock is 225/50R17 (25.85" dia) and the V has 245/45R18's (26.68" dia). If you keep the diameter between stock and the V, you'll be fine.
The 235 size in a 55 series just looks too tall (like the car is a 4X4). Plus, my speedometer will be off by between 3 and 4 MPH. Up to a 3% delta on tire diamater is generally safe, and this is a 5% delta. I'm getting them changed.
 

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Tire size for the factory 17" rims that came with the 1SC package in 225/50/17. There is a label inside the drivers door frame that shows the tire size for that particular car.
 

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Discussion Starter #10
Pengineer91 said:
Tire size for the factory 17" rims that came with the 1SC package in 225/50/17. There is a label inside the drivers door frame that shows the tire size for that particular car.
Thanks, I almost forgot about this and looked last night. I have long used the door decal for tire pressure reference.
 

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Discussion Starter #11
Well, they changed my Imperial Star (el-cheapo) 235/55/17 tires to Good Year Eagle RS-A 225/50/17. I'm glad to have the right size but have read about a few hydroplaning issues with these tires when the tread depth gets low. Unfortunately, it's all they could get. These are OE tires of the proper size and look much better. I'm happy with them so far, but the treadwear is much lower than the ones removed (260 vs. 520) because they have a higher speed rating and are a softer compound. I anticipate they will last about 30K miles.
 

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2004CTS said:
Well, they changed my Imperial Star (el-cheapo) 235/55/17 tires to Good Year Eagle RS-A 225/50/17. I'm glad to have the right size but have read about a few hydroplaning issues with these tires when the tread depth gets low. Unfortunately, it's all they could get. These are OE tires of the proper size and look much better. I'm happy with them so far, but the treadwear is much lower than the ones removed (260 vs. 520) because they have a higher speed rating and are a softer compound. I anticipate they will last about 30K miles.
True, The GoodYear RSA do not last long. It's been a complaint by some.
 
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