rims and lowering

**homerunhtr21** · 01-18-2007, 05:56 AM

i was wondering if i got the new c6 rims 18 x9.5 ( 275 or 285 tires) all around and then put a por-kit on if I would have any problems with clerance or rubbing of the tires?

**Eugenio_SS** · 01-18-2007, 06:30 AM

i'm assuming you are talking about the prokit springs ?
there should be no issue, because although you go to 18", if tires chosen properly, such as a 275/35-18, it will have the exact same size as the stock 275/40-17... only difference being you have 1" more of wheel and 1" less of sidewall... but in the end... it's exact same size.
btw, you recall the offset on those wheels ?

**homerunhtr21** · 01-18-2007, 06:48 AM

Originally Posted by Eugenio_SS

i'm assuming you are talking about the prokit springs ?
there should be no issue, because although you go to 18", if tires chosen properly, such as a 275/35-18, it will have the exact same size as the stock 275/40-17... only difference being you have 1" more of wheel and 1" less of sidewall... but in the end... it's exact same size.
btw, you recall the offset on those wheels ?

57MM ..I THINK

**Eugenio_SS** · 01-18-2007, 03:11 PM

that means you'll need ~ 1/4" spacer.

**Jon7I2** · 01-19-2007, 02:46 PM

Originally Posted by Eugenio_SS

i'm assuming you are talking about the prokit springs ?
there should be no issue, because although you go to 18", if tires chosen properly, such as a 275/35-18, it will have the exact same size as the stock 275/40-17... only difference being you have 1" more of wheel and 1" less of sidewall... but in the end... it's exact same size.
btw, you recall the offset on those wheels ?

40mm sidewall to 35 mm sidewall equals a 5 mm difference, and a 5 mm does not equal 1 inch, and neither does 17" wheels to 18". The circumference is one inch different or greater, but not necessarily the height of the wheel. A 17” wheel is not 1” lower than an 18” wheel.

**01Z28M6** · 01-19-2007, 03:37 PM

Originally Posted by Jon7I2

40mm sidewall to 35 mm sidewall equals a 5 mm difference, and a 5 mm does not equal 1 inch, and neither does 17" wheels to 18". The circumference is one inch different or greater, but not necessarily the height of the wheel. A 17” wheel is not 1” lower than an 18” wheel.

The 40 and 35 are not millimeters; it is aspect ratio. 275/40/17 means the sidewall is 40 percent the width of 275 millimeters.