205 vs 215 help

[digglesworth]

So is calibration of the speedo possible through a tuner or something? I'm considering 215/40 on a 7.5 rim et40 and mountune springs. I want them to sit as flush as possible without rubbing. I've heard 17x8s et40 will rub even with 205s. Basically between the rota grids 17x8 et40 (since I can't find Titans in black - only that chromium black) or the XXR 527s in 17x7.5 et40... Can someone smarter than me tell me how much farther the 17x8 et40 will stick out vs the 17x7.5 et40....
My choices are
17x8 w/ 205s. (215s will rub for sure)
17x7.5 w/ 205s or 215s...
I'm so lost on this. I don't really want a speedo that's off, not do I want to rub, but I want it as flush as possible.... Help. Lol

 

[jeffreylyon]

A 17x8 ET40 will stick out 1/4" more than a 17x7.5 ET40. I'm running 17x8 ET45 with 12.5mm spacers, making my offset ET33, and I don't rub with 2.5? of camber. I probably would with less camber.

 

[MrClean]

Your speedometer calibration shouldn't be changing so long as you are keeping overall wheel and tire diameter close to stock. Also any changes in overall wheel diameter (at least on this car since our wheel options are rather limited) would minimally affect speedometer readings. The readings would be somewhere around 1-3mph difference.

 

[M-Sport fan]

^^^Yes, most of the 215/40-17s are less than a half inch taller than the OEM/factory setup, and the 205/40-17s (unless you go 205/45-17, which is close to an inch taller in most cases/tire models) are the same exact overall diameter as the factory setup, even on an 8" wide wheel.

 

[digglesworth]

I found this pic of the 527s and I like how that looks. I guess I could always add some 5mm spacers if I don't think they sit flush enough... That would almost push them out as far as the 8s in a 40 offset.

 

[digglesworth]

^^^Yes, most of the 215/40-17s are less than a half inch taller than the OEM/factory setup, and the 205/40-17s (unless you go 205/45-17, which is close to an inch taller in most cases/tire models) are the same exact overall diameter as the factory setup, even on an 8" wide wheel.

So going with a 215/40 on a 7.5 rim will be pretty close to oem height... I'm guessing the 215 will be ever so slightly stretched on a 7.5 rim, thus taking away just a little bit of height on the sidewall...

 

[808FiST]

I think it depends on the manufacturer of the tires. Our Bridgestone OEM in 205/40/17 measures 7.6" tread width, thus I don't think it would look stretched on a 17x7.5 rim. The 215/40/17 may not be stretched at all, depending on its tread width.

So going with a 215/40 on a 7.5 rim will be pretty close to oem height... I'm guessing the 215 will be ever so slightly stretched on a 7.5 rim, thus taking away just a little bit of height on the sidewall...

 

[M-Sport fan]

The tread width of the Star Spec 215/40-17 is 8.0", same exact width of the wheels I will be putting them on.

To me at least, that is 'square', NOT "stretched".

 

[jeffreylyon]

So going with a 215/40 on a 7.5 rim will be pretty close to oem height... I'm guessing the 215 will be ever so slightly stretched on a 7.5 rim, thus taking away just a little bit of height on the sidewall...

I don't think that being over- or under-square will affect the circumference of the tire at all.

 

[M-Sport fan]

I don't think that being over- or under-square will affect the circumference of the tire at all.

+1 ^^^