225s on 15s and fitment. . . ATTN: Jay

[rwh11385]

Say you are trying to figure out what "wide" 225s would fit on a 15 inch wheel. It is known that "wide" 225s will fit on a 15x7 wheel. Either ET24 or ET25. I know some who space this out a little though...Michael Osbourne) It is also known that "wide" 225s fit on ET27 Koseis.

What about wider wheels? What would be fitting on a 15x7.5. I'm trying to use the offset calculator, but don't know if it would rub the strut or fender first. How much room is left with street 225s on Ronals?

I gather from Whitney that 225 Kuhmo Victoracers fit, but just barely from the strut. ET22 and 15x8. A wider 225 probably wouldn't. Hmmm. Maybe a 3mm spacer?

Can't really roll the fender outwards, only flatten the fender lip. If you know anything, please add it here.

[Dave]

you just need the Dr. Shchipkov fender mod and you can go as big as you want . . .

[rwh11385]

somehow i dont think that would work.

i.e. look what happened to MAkard...

[Axxe]

If the Ronals were ET22 they'd be perfect for REAL 225's. Most 225's run too wide to fit Ronals without spacers (with the exception of square-shouldered tires, like ES100's).

Let's some simple math to figure this out:

Ronal LS, 7.5" wide, ET25

7.5" = 190.25 mm

Distance from hub face to inboard edge of wheel (d) = offset (ET) + 1/2 width of wheel (w)

d = ET + w/2

d (Ronal) = 25 + 190.25/2
d (Ronal) = 120.125mm


Let's do the same for 15x7 ET27 and 15x8 ET22 (assuming same sort of inner lip, typical wheels are usually 1/4" wider on each side past what they measure, so this is approximate)

15x7 ET27:

d = 115.9mm


15x8 ET22:

d = 123.6mm


As you can see, the 15x8 ET22 Kosei is the closest to the strut, but that is just the wheel. A fat tire hangs out another 1/4" - 3/4" outside the outer edge of the wheel.

Distance to fender (in the same parameter sense) is simply the overal wheel width minus the numbers I calculated. Hope this helps, I'm going to ponder over a way to truly figure out how much space an E30 has, will probably take some measurements with the wheels I have to get a base line going.

[rwh11385]

you just need the Dr. Shchipkov fender mod and you can go as big as you want . . .

Any wheel and DOT-approved tire combination that fits under the stock body. Fender and wheel openings shall remain unmodified except that it is permitted to roll under or flatten any interior lip on a wheel opening for tire clearance purposes.

of course....maybe an early model has its advantages...


thanks Axxe. maybe this can be answered that way, or maybe it'll just need to be a try and see thing.

[Dave]

of course....maybe an early model has its advantages...


thanks Axxe. maybe this can be answered that way, or maybe it'll just need to be a try and see thing.

So Serious, Robert . . . .

Chill, You are just pissed that I have such the Budget Beater deals lately!!!

[permit]

This could sort of maybe tie in with what Heeter is talking about, so I'm going to ask it...

Anyone know just how much rolling Alex had to do to fit his meaty Koseis? I'm just trying to get some info here because some people might know, he doesn't sign on much anymore, so his replies to PMs come slowly. Any help would be great.

[Axxe]

Trial and error is the best way, but it is also the most expensive way. I've got 205's on a 16x17.5" rim, and the fender needs to be rolled. I'm tucking rear tire with an early arch on IE Stg 3's.

[permit]

Oh, and in case anyone is planning on buying wheels, TireRack only has Kosei 15x8s left in ET12.

[rwh11385]

If the Ronals were ET22 they'd be perfect for REAL 225's. Most 225's run too wide to fit Ronals without spacers (with the exception of square-shouldered tires, like ES100's).

Let's some simple math to figure this out:
Distance to fender (in the same parameter sense) is simply the overal wheel width minus the numbers I calculated. Hope this helps, I'm going to ponder over a way to truly figure out how much space an E30 has, will probably take some measurements with the wheels I have to get a base line going.

Hmm. I am trying to figure how the tire would fit, and am using the tread width, although i may have to consider the section width in reality.

the tire i look at would be 8.7" inch in tread, assuming an extra 1/2" in measure rim width yield 2/10". that is 217.5mm, divided by 2, then plus the offset of 22 = 130.75

the 225/50-15 ES100s are on a 7" measured rim width, so they are let's say 8.5" tread on the Ronal. that is 131.25. so I believe that means I have more clearance of tread with the 225 I want on the bigger wheel. Figuring the section width as well, there should be more clearance to the strut with the 15x8 ET22s of the tire sidewall. (i think)


now the problem may be on the other end.
217.5 overall tread width - 130.75 = 86.75
212.5 overall tread width - 131.25 = 81.25

so the 225 on the 15x8 et22 would be 5.5mm closer to the fender (or into it). I don't think a 225-50-15 on a Ronal has that much clearance to give, but who knows.

hmmmmmm. obviously this doesn't matter anytime soon, and i could eventually just buy a 15x8 et22 kosei and test fit it with the tires i want. and if that doesn't work, just use Ronals (or similar 7.5 wheel), or go for the easy Team Dynamics. This is for the future, and not for now.... and maybe I want to keep some details under wraps.

[rwh11385]

If the Ronals were ET22 they'd be perfect for REAL 225's.

if only every tire i liked wasn't in 15"
16X7.5 BLANK ET22 K1 RACING * $199.00


nothing says I couldn't run a small spacer though. someone else runs one with their euro weaves on REAL 225s. anything to give an extra half inch or inch on everyone else would be sweet.

and oops. i misread a half inch of wheel would yeild an additonal 2/10" section width as tread width. oops there are some errors in my math therefore.

okay, assuming the 7.5" wheel makes the section width of the ES100 9.2", there is 140mm towards the strut, versus 140.75mm of the 225 on the 8" wide Kosei.

and going the other way, 90mm with the ES100 on the Ronal, versus 91.75mm of the tire on the Kosei... (I think).

[Dave]

if only every tire i liked wasn't in 15"
16X7.5 BLANK ET22 K1 RACING * $199.00


nothing says I couldn't run a small spacer though. someone else runs one with their euro weaves on REAL 225s. anything to give an extra half inch or inch on everyone else would be sweet. (extra 2/10 or 4/10" tread width)

RS2s in 225/45 or 225/50
RA1s in 225/50

[2002maniac]

Oh, and in case anyone is planning on buying wheels, TireRack only has Kosei 15x8s left in ET12.

Ben e-mailed me today. They have 15x8 ET27 as well.

[2002maniac]

What's wrong with your Kosei's Heeter? Dont like 225 on 7"?

[Dave]

What's wrong with your Kosei's Heeter? Dont like 225 on 7"?

I have them now and he needs to have something much more FUH RAZE than lowly unskilled Dave.

Either that, or he is bored stiff at his co-op job thing and his mind is wandering . . .