BBS RS New Lips, Offsets & Fitment Concerns ~ 87 325iS

[Saloon]

I am posting to seek help from the experts.

I have an 87 325iS that I am restoring. It will have Bilstein Sport Shocks, and H&R Sport Springs when I'm done.

I have searched, but my questions are kind of muti teared.

I recently traded for a set of BBS RS, to be exact...

16x8 ET42 RS322 1' Lips - with 205/45/16
16x9 ET40 RS323 1.5" Lips - with 215/40/16

They are 5x100 so I will be running 4x100 adapters which the lowest MM I've found is 20mm adapters.

So the questions are

A. Will the ET20 / ET22 (ETs with 20mm adapters) be optimal front and rear?
B. Can I put the rear 1.5" lips on the front? What ET will that make them?
C. Can I put 3" lips on the rear? What ET will that make them?
D. If no what size lips can I go to and what ET will it make them?

Thanks for taking the time to read!
Saloon

[Saloon]

Bump?

[8380 Labs]

I am posting to seek help from the experts.

I have an 87 325iS that I am restoring. It will have Bilstein Sport Shocks, and H&R Sport Springs when I'm done.

I have searched, but my questions are kind of muti teared.

I recently traded for a set of BBS RS, to be exact...

16x8 ET42 RS322 1' Lips - with 205/45/16
16x9 ET40 RS323 1.5" Lips - with 215/40/16

They are 5x100 so I will be running 4x100 adapters which the lowest MM I've found is 20mm adapters.

So the questions are

A. Will the ET20 / ET22 (ETs with 20mm adapters) be optimal front and rear?
B. Can I put the rear 1.5" lips on the front? What ET will that make them?
C. Can I put 3" lips on the rear? What ET will that make them?
D. If no what size lips can I go to and what ET will it make them?

Thanks for taking the time to read!
Saloon

1) those tires will be entirely too small for that suspension set up

a) optimal in what way? you should clear the suspension on the inside fine, and those offsets will be inside the fenders both front and rear, although the rears will be tucking more.

b) fronts would be 8.5 et36 or so with 1.5" lips

c) rears would be 10.5 et3 with 3" lips

d) why do you want to change the lips all around?

the first thing i'd address if you're going for a really aggressive wheel/tire setup (which is what it sounds like) would be to make sure i had a suspension that gave me some adjustability and allowed you to go low enough.

those 8s and 9s will fit nicely with some 25s up front and 30s out back in my opinion. that would get you just a hair less than flush or right there all around.

[Saloon]

1) those tires will be entirely too small for that suspension set up

a) optimal in what way? you should clear the suspension on the inside fine, and those offsets will be inside the fenders both front and rear, although the rears will be tucking more.

b) fronts would be 8.5 et36 or so with 1.5" lips

c) rears would be 10.5 et3 with 3" lips

d) why do you want to change the lips all around?

the first thing i'd address if you're going for a really aggressive wheel/tire setup (which is what it sounds like) would be to make sure i had a suspension that gave me some adjustability and allowed you to go low enough.

those 8s and 9s will fit nicely with some 25s up front and 30s out back in my opinion. that would get you just a hair less than flush or right there all around.

I guess by optimal I mean close to flush.

I ideally would like a larger lip on the set, so I figured the logical move would be to swap the rears to the front and get new rears ie. 3" or now thinking more like 2"-2.5" would look better. From my research a 10.5 might look slightly out of place on an standard E30.

My end goal is to have the largest lip possible while still being as flush as possible, with little to no poke.

So I guess the main question is then what is the end ET (F&R) that is needed to be flush? and I can go from there with what size lips are available to achieve those ETs.

Thanks for taking the time to help.

Cheers,
Saloon

[8380 Labs]

offsets change depending on the width of the wheel, so you're going about it slightly backwards i think.

you're right that 10.5 is too much.

just for reference, this is my car at 8.5et11 front and 9.5et9 rear. these offsets have the fronts at a hair past flush front and a bit more past flush rear.



if you swap the 1.5" lips to the front, 8.5 et15 or so will get you flush, so 20mm adapters or so.

in the rear, i wouldn't go more than 9.5...which would mean a 2" lip and put you at et33 before adapters...so 20mm adapters rear would get you about flush, and you'd still have a minimal but comfortable level of inner clearance.

p.s. i'd also recommend 205/45s up front and 215/45s out back for your suspension setup.

[Saloon]

offsets change depending on the width of the wheel, so you're going about it slightly backwards i think.

you're right that 10.5 is too much.

just for reference, this is my car at 8.5et11 front and 9.5et9 rear. these offsets have the fronts at a hair past flush front and a bit more past flush rear.



if you swap the 1.5" lips to the front, 8.5 et15 or so will get you flush, so 20mm adapters or so.

in the rear, i wouldn't go more than 9.5...which would mean a 2" lip and put you at et33 before adapters...so 20mm adapters rear would get you about flush, and you'd still have a minimal but comfortable level of inner clearance.

p.s. i'd also recommend 205/45s up front and 215/45s out back for your suspension setup.

That's exaclty the answers I was looking for!

Now I have a much better idea of my options, thank you so much for you help!

PS do you have any more photos of your car?

What size tires, suspension, ect?

Thanks,
Saloon

[8380 Labs]

205/40 and 215/40s on FK konigsport coilovers, which at that height are probably 2" lower than your proposed set up will go.

[PannikAttk]

offsets change depending on the width of the wheel, so you're going about it slightly backwards i think.

you're right that 10.5 is too much.

just for reference, this is my car at 8.5et11 front and 9.5et9 rear. these offsets have the fronts at a hair past flush front and a bit more past flush rear.



if you swap the 1.5" lips to the front, 8.5 et15 or so will get you flush, so 20mm adapters or so.

in the rear, i wouldn't go more than 9.5...which would mean a 2" lip and put you at et33 before adapters...so 20mm adapters rear would get you about flush, and you'd still have a minimal but comfortable level of inner clearance.

p.s. i'd also recommend 205/45s up front and 215/45s out back for your suspension setup.

What are the original specs on your wheels? The wheel centers seem to be protruding quite a bit. Is it because you're running spacers for all that poke?

I picked up some RS's recently but am addressing suspension at the moment (coils arriving in 2 weeks). My wheels are 16x7 et24 and 16x8 et24 with slant lips on the rears.

Thinking of running the 8's on the front with a 10-12mm spacer. Then possibly converting the 7's to 9's and slapping them on the rear with some 3" lips (which should leave me at et 0 or so). This should poke just a bit but not too much. Just curious about your setup since I'm in the process of building a nice stance myself :)

[8380 Labs]

the original specs of the wheels are 8.5 et56 and 9.5 et59, i didnt change them at all, i only added adapters so they'd bolt up to my car. they are higher offset RSs that came as an option on porsche 928S4s, thats why they dont have a ton of lip...most of the width is in the barrel.

your setup has much lower offsets, which translates to bigger lips. if they are direct bolt up then you should be fine with your proposed plan. but for the record, 9 et0 will poke more in the rear than my setup...so if you think mine has a ton of poke (maybe 3/8" in the rear) then i'd rethink.

[PannikAttk]

the original specs of the wheels are 8.5 et56 and 9.5 et59, i didnt change them at all, i only added adapters so they'd bolt up to my car. they are higher offset RSs that came as an option on porsche 928S4s, thats why they dont have a ton of lip...most of the width is in the barrel.

your setup has much lower offsets, which translates to bigger lips. if they are direct bolt up then you should be fine with your proposed plan. but for the record, 9 et0 will poke more in the rear than my setup...so if you think mine has a ton of poke (maybe 3/8" in the rear) then i'd rethink.

Thanks for the info and advice...I really don't mind poke at all. I used to run Brock B2's on a MKIV GTI with 8.5 up front and 10's on the rear...the rear offset was 13! I know, I know...FWD car...but it looked pretty sweet :)