Ideal tire size?

[Afredo]

Looking to get a set of staggered wheels for my e30, 16x7 front 16x8 rear, +15 offset, whats the ideal tire size for each size rim respectively? Was planning on getting a set of 205/40 or 45 R16s. And will I have to roll the fenders and/or use wheel spacers with these size wheels? Thanks!

[digger]

IIRC 16x7 is 205/50/16 to give correct radius and 225/45/16 for 16x8

[Afredo]

IIRC 16x7 is 205/50/16 to give correct radius and 225/45/16 for 16x8

IIRC? And I'm never entirely sure what the first two numbers in the tire size signify?

[bmw325csi]

The rear will slightly rub with that offset. The front will be ok. I would personally do 205/50 minimum.

[bmw325csi]

"If I recall correctly"
Also 205 is section width and 50 is sidewall. 50% of the section width I think.

[Afredo]

The rear will slightly rub with that offset. The front will be ok. I would personally do 205/50 minimum.

205/50 all around? car is lowered with the eibach spring kit, 1.3in rear 1.0inch front i believe? i was told i would need to roll fenders for 16x8 rims, is that true?

[bmw325csi]

If your offset is around 25+ you won't need a roll with 205 but with your 15 offset is gonna rub. I have 15x8 et15 with 205/50 and they rubbed like crazy before I rolled and flared the crap out of my rears.

[Afredo]

If your offset is around 25+ you won't need a roll with 205 but with your 15 offset is gonna rub. I have 15x8 et15 with 205/50 and they rubbed like crazy before I rolled and flared the crap out of my rears.

what exactly does offset mean?

the wheels I want are offered in either 16x7 +15 or 16x8 +15, i wanna get a staggered set so I'd have 16x8 in the rear, so I'd have to roll them sounds like. What exactly is the process for that, just get a fender roller and heat up the paint so it doesn't crack while you're rolling them? How much do you have to roll them?