2000bobby

Hi there,

I know this has probably been asked lots of times but I searched and couldn't find anything on this.

I'm looking to put these OEM c6 5 spoke 18/19s on my car but the rear tires are worn. I'm was wondering if I can put a 305 30 19 on the rear and leave the front 245 40 18 as they still have a good 60ish% left. I want to make sure I wont get any error messages/active handling problems. Whats the best rear tire size to use?

Also does anyone know what spacers will make the wheels flush with my fenders? Thanks

jd_black_00

I've got a 7/8in spacer in the rear and a 5/8in spacer in the front. Here is the result:

2000bobby

what size are your tires?

2000bobby

Bump

Bimmervet

Good question, I am thinking about buying the 305 for the rear. I have 245 in front. That is only .48 difference in diameter, they say you need .50. Will .48 be ok?
245/40R18
Section Width: 9.65 in 245.00 mm
Rim Diameter: 18 in 457.2 mm
Rim Width Range: 8 - 9.5 in
Overall Diameter: 25.72 in 653.20 mm

305/30R19 Section Width: 12.01 in 305.00 mm
Rim Diameter: 19 in 482.6 mm
Rim Width Range: 10.5 - 11.5 in
Overall Diameter: 26.20 in 665.60 mm

2000bobby

Does anyone have an answer for this?

Quicksilver Vert 01

With stock size C6 tires and wheels mounted on a C5, no spacers are needed on the front, and 1/4 to 3/8 inch spacers will bring the the rears flush with the fenders.

Bimmervet

DOES ANYONE HAVE AN ANSWER TO THIS?? only .48 difference in diameter, they say you need .50. Will .48 be ok?

lionelhutz

It will most likely work fine but no-one will guarantee it.

Quicksilver Vert 01

It may be OK for now, but as the rear tires wear it could soon be considerably less than .48 in. Rear tires tend to wear at a faster rate than front tires.

There's really no definitive answer here. In my opinion, you're cutting it too close.

Bimmervet

Thanks, that makes sense.