Allstar

whats the stock tire size for the 05+ GT?? cause mine have 275/?/17 and i highly doubt thats stock

blike

235/55/17 if it came with 17's

deekum1627

ya 235/55/17 or 235/50/18

howarmat

damn if those are the stock rims you probably should replace the tires with 255/50......275 is really meant for a 8-8.5 rim

Allstar

well im just gunna get new rims anyway.. and new tires along with it... prolly do 295's in the back

olvanish

Then you'd need 18x10's for the 295's. By the way, 275 is for a 9 inch rim, not 8 or 8.5

mygt500

Maybe right and I have a 265 on an 8.5 inch wide rim in front!

Stkjock

295s on a 10 is good...imho.... however....a bit too pat of an answer about the 275s.... 275/40s for a 9... 275/45 are ok for a 8.5 rim but its not likly those are on his 17s

05Retro

Ihave 275-50-17 onmy rear 17x8 Bullitts. The measured rim width for this tire is 8.5 with approved rim widths between 7.5 to 9.5. The series of tire (55,50,45,40,etc.) helps determine the rim width not only the size like 275,265,etc. Look it up,to many people seem to group the 275 sizes into one rim width which is not true.

06VistaBlueGT

Not sure this is true, 275 is the width of the tire in mm's. The 55,45 etc is the aspect ratio and has nothing to do with tire width. The only way I could see that the aspect ratio would have an effect on what width rim you are putting the tires on is if they allow a tire with a taller aspect ratio to be put on a narrower rim because the sidewall would be easier to pinch together to install on a narrow rim. The problem though is if you mount a tire on a rim too narrow is you make the middle of the tread buckle up and the sidewalls bulge out.The only way to adjust for correct contact patch is to under-inflate the tiresto flatten the tread and this could adversely affect handling.