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Discussion Starter · #1 · (Edited)
So I’ve been having a hard time putting 17s on my ctsv V2 sedan it is an auto car
I’ve had problems with the caliper clearance on the top of the caliper and now that I have them fitting obviously it’s a bumpy ride they’re not balanced yet doing that tomorrow but my car is acting like it’s hitting the brakes and trying to accelerate at the same time I have no idea what it’s doing but as soon as I put the stock wheels back on it’s perfectly fine also specs 17x10 race stars / 305/45/17 mickeys FRONTS 255/40/19 SOMEONE HELP
 

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2009 Sedan
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Summit says 27.9" for diameter. Either way, that's almost an inch difference.
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If the car thinks the front is going 60 and the rear is going 62, it's going to try and save you. I think @MrSurly posted about this awhile ago? He asked about turning off StabiliTrack or TC or both I think it was.
 

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If you have HPT, use gear wizard, and change your wheel/tire size, and save that tune.
Also, with radials on the car, get a tape measurer, and measure the actual hight, don't go with manufacturer size, they are usually off.
Have 1 tune for street tires, and 1 for radials.

If those 305/45/17s are Street Rs, you can use 27.80 for tire height.
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Discussion Starter · #6 ·
Just wanna thank you to you guys for the help huuuge help honestly, coolest group of car dudes , I got the wheels rebalanced today and the car drives great I do still want to change the tire size over as well
 
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