M /// Max wheel offset question

Mister T · Post by **Mister T** » Fri Dec 18, 2015 7:57 pm

With a 225/35/19 on an 8.5J rim you'd get away with ET29 on the front, that's a very small tyre

Beedub · Post by **Beedub** » Fri Dec 18, 2015 8:21 pm

Mister T wrote:With a 225/35/19 on an 8.5J rim you'd get away with ET29 on the front, that's a very small tyre

i run 235/40 semi slick, which i wider than a street 245 section tyre...

no way you could run an 8.5" wide ET29 on the front of a z4 without running a decent amount of camber, 225 tyre or not.... the actual Rim sits proud of the fender line at stock camber levels.

Mister T · Post by **Mister T** » Fri Dec 18, 2015 8:27 pm

219M with 235/40/18 Michelin Pilot Sport 3. Camber pins still fitted. Sits perfectly flush.

A 225/35/19 would have more stretch and would also have a slightly smaller diameter.

Beedub · Post by **Beedub** » Fri Dec 18, 2015 8:43 pm

Mister T wrote:219M with 235/40/18 Michelin Pilot Sport 3. Camber pins still fitted. Sits perfectly flush.

A 225/35/19 would have more stretch and would also have a slightly smaller diameter.

it may bolt on,.... i tested these with 3 different sets of tyres statically so nothing would get damaged, they contacted at numerous points under full compression.

now go and drive it hard and send a pic of the inner fender.... or infact send a pic of the inner fenders as they are now

Papa_Zee · Post by **Papa_Zee** » Tue Feb 19, 2019 1:18 am

Help Needed!

I would like to conservatively space out the wheels on my MR.
I am running the stock 224s (i think they are perfect for now for the roadster) and would just like to know if 10mm all round can cause any rubbing issues? The car is not lowered at the moment as i am careful not to go overboard (yet) with the mods but still have a moderately wider stance. Thanks.

Papa

mmm-five · Post by **mmm-five** » Tue Feb 19, 2019 9:32 am

You 'should' be okay, but as with most things you won't really know until you try.

There were reports of some people running 19" CSLs who would get rubbing and other who would swear they had zero rubbing - same car, same wheels, same tyres (Michelin PS2 at the time).

Mine rubbed slightly over 'yumps' and on hard left corners - and I regularly wore away the arch liner.

I even get a little rear rubbing now (on OE 224Ms and 225/45r18 and 265/40r18) and I have 10mm spacers on the front to clear the Brembo brakes), but only if I have the coilovers on a softer setting (especially into the compression at Tiergarten/Hohenrain and Ex Muhle at the Ring). But if I crank it to full, the rubbing disappears - although I'd not set it that hard in the cold/wet. I'm planning on going back to 255/40r18 rears when they need replacing.

mpm · Post by **mpm** » Tue Feb 19, 2019 9:58 am

I run a 9.5 wide on the rear with ET22. Sits perfect imo

mr wilks · Post by **mr wilks** » Tue Feb 19, 2019 10:07 am

I ran my rear 224s with a 20mm spacer lowered on Eibachs.
Front no spacers but its no problem with up to 10mm on a stock suspension car though I preferred the enhanced stance of wider rear / narrower front.

BMWZ4MC · Post by **BMWZ4MC** » Tue Feb 19, 2019 11:31 am

I used 12mm spacers without any rubbing from either 224s or CSLs both on stock suspension and later on Eibachs.

When I fitted KW Clubsports, I had to run 5mm spacers with my CSLs to clear the suspension at the front, and to reduce rubbing of the rear arch liners with big compressions. This caused rubbing of the near side front arch liner but only with full lock.

Interestingly, fitting an AP Racing BBK has increased the front track by a few millimetres and I no longer need spacers at the front to clear the suspension with the CSLs and I have no rubbing of the front arch liner, even at full lock. Without 5mm spacers, the rear still rubs slightly under load. This is because I’m using OEM discs with the AP callipers at the rear, so there has been no change in track there.

I’ve concluded that clearance across the width of the arches is marginal and that full lock brings the front tyres extremely close to the back of the brake cooling ducts in the arches. Any significant increase in wheel and tyre width or effective change in offset may cause rubbing, especially if the car is lowered.

Papa_Zee · Post by **Papa_Zee** » Tue Feb 19, 2019 2:48 pm

mr wilks wrote: ↑Tue Feb 19, 2019 10:07 am I ran my rear 224s with a 20mm spacer lowered on Eibachs.
Front no spacers but its no problem with up to 10mm on a stock suspension car though I preferred the enhanced stance of wider rear / narrower front.

Nice... so thats 10mm at the front and 20mm rear with no rubbing?
How much did you drop it by with the eibachs?

Z4-forum.com

Z4-forum.com