Well, the time has finally come to replace the god awful steelies with a set of 16" mag wheels. Right now I'm running 195-55-r15's, and was told that the equivalent tire size for a 16" rim would be 205-50-r16. That being said, I'm afraid that a sidewall that small is going to look awful dumb on my car. Base G5's have a terrible stance as is and I was hoping to alleviate some of the wheel gap with a 205-55-r16 instead. Any calculator I punch these tire sizes into says that that would give a 6.11% speed difference and definitely require a speedo recalibration which I really don't want to do. Is anyone else running either of these tire sizes that I could take a look and see how they fit onto the actual car? And if worst comes to worst how much of a pain is it to just get the speedo recalibrated? Thanks for any and all help!

 

Just want to put an update, thanks to the local police speed trap my speedometer is actually reading about 2 mph high right now on 195-55-R15 tires. Evidently the OEM tire size for a base G5 is either a 60 or 65 aspect ratio, not a 55. A 205-55-R16 tire should make the speedo read less than 2% off if my calculations are right. Problem solved! With that being said, does anyone have pics of 16" rims on their Cobalts/G5's? I'd love to get an idea of what my baby will look like!