so im thinking of upgrading my 17's to solstice gxp 18's....ive already basically figured out that the wheels will fit but my question is...the tires on the 18's have an overall diameter that is 1.5 inches larger than those of the 17's...is this going to cause problems with the various sensors in the car?? (abs, bcm, pcm, etc)???

fyi the 2 tire sizes are
205/50R17 on the 17x7's
and
245/45R18 on the 18x8's

if anyone knows of any other problems I will encounter doing this please let me know!!

prob gonna throw some winter tires on the stock wheels seeing as at amost 20k miles the pirellis are almost shot

 

I couldnt see it throwing off any sensors but the speedo and im not sure but you may get some rubbing with a tire that wide

 

A 235 or less will be better suited for the application.

 

i know but im trying to avoid having to take the brand new 245 goodyear eagle f1's off the wheels...im trying to buy them at work b/c we put 19's wheels on a car we have in stock so the OEM 18's w/ tires are just sitting in the shed out back.

 

From using the tire calc on 1010tires.com......


http://www.1010tires.com/TireSizeCalculator.asp

Stock Tire - 205/50R17 Tire 1 - 245/45R18
Section Width: 8.07 in 205 mm

Section Width: 9.64 in 245 mm
Rim Diameter: 17 in 431.8 mm

Rim Diameter: 18 in 457.2 mm
Rim Width Range: 5.5 - 7.5 in

Rim Width Range: 7.5 - 9 in
Overall Diameter: 25.07 in 636.77 mm

Overall Diameter: 26.68 in 677.67 mm
Sidewall Height: 4.03 in 102.36 mm

Sidewall Height: 4.34 in 110.23 mm
Radius: 12.53 in 318.26 mm

Radius: 13.34 in 338.83 mm
Circumference: 78.75 in 2000.2 mm

Circumference: 83.81 in 2128.7 mm
Revs per Mile: 829.6

Revs per Mile: 779.6
Actual Speed: 60 mph 100 km/h

Speedometer1: 56.3 mph 93.9 km/h
Speedometer Difference: - Speedometer Difference: 6.413% too slow




I'd mount one and test the fitment.

 

lol im sorry u kinda lost me there...can u convert that to laymans terms for me??

 

^^^ya they are too big

 

I'm pretty sure that the offset will really screw things up.

I've talked about this with someone before, and I don't remember the numbers, but the SKY wheels tried on a Redline did not fit, even though they were 5x110.

 

Could test one, but, yes, looks too big of course.

 

what about using spacers??? would that help and what size??