225/40 or 45 255/35 or 40?

Torpalasse · Post by **Torpalasse** » Wed Jan 16, 2019 6:32 pm

As topic says, will it fit without problems or rubbing?
Want some extra clearance to my z4 3,0 -03

Chris_D · Post by **Chris_D** » Wed Jan 16, 2019 11:35 pm

needs clarity....?
What are you asking here?

Mr Tidy · Post by **Mr Tidy** » Wed Jan 16, 2019 11:38 pm

Yes, what wheels are you using?

225/40 x 18 front and 255/35 x 18 rears are the OEM tyre sizes on staggered 18" rims. Is your car lowered, or using spacers?

patriot66 · Post by **patriot66** » Thu Jan 17, 2019 12:21 am

I think maybe Torpalasse is asking can he increase the aspect ratio on the front from 40 to 45 and rear from 35 to 40 without any rubbing etc

road warrior · Post by **road warrior** » Thu Jan 17, 2019 12:24 am

patriot66 wrote: ↑Thu Jan 17, 2019 12:21 am I think maybe Torpalasse is asking can he increase the aspect ratio on the front from 40 to 45 and rear from 35 to 40 without any rubbing etc

i hope so cus that what im doing as well

the increase will raise the car by 1/2 an inch and increase the diameter by an inch

philbo909 · Post by **philbo909** » Thu Jan 17, 2019 9:05 am

Torpalasse wrote: ↑Wed Jan 16, 2019 6:32 pm As topic says, will it fit without problems or rubbing?
Want some extra clearance to my z4 3,0 -03

Obviously depends on the wheels/spacers you have, but if it's an oem set up you could change up to the sizes as you specify in the title.
Word of caution though, check your actual speed compared to speedo first.

dhobbs · Post by **dhobbs** » Thu Jan 17, 2019 9:30 am

what are the ///M tyre sizes for 18 inch?
I know some people recommend them for the non-M

Zedtastic · Post by **Zedtastic** » Thu Jan 17, 2019 3:56 pm

I have just fitted (as in 20 minutes ago), 225/45-18 on the front and 255/40-18 to the rear. I've got standard Sport suspension and 5mm spacers at the front and 12mm at the rear. The off-sets are standard (ET 47 at the front and ET50 at the rear). So far there's no rubbing issues and all clears fine on full lock. I won't know if a bumpy road will cause rubbing problems, but I doubt it. Hopefully this helps answer the OP question.

: P1170036b.jpg (131.07 KiB) Viewed 650 times

mr wilks · Post by **mr wilks** » Thu Jan 17, 2019 6:40 pm

Anyone with stock rims ( so 8.5j rears) considering upping the rear rubber to 255 40 should consider 245 40 as the best option , the 255 40 18 on Z4M style 224s are fitted to 9j rims .

Torpalasse · Post by **Torpalasse** » Thu Jan 17, 2019 8:26 pm

patriot66 wrote: ↑Thu Jan 17, 2019 12:21 am I think maybe Torpalasse is asking can he increase the aspect ratio on the front from 40 to 45 and rear from 35 to 40 without any rubbing etc

Thats exactly my question. No spacers, no nothing. But I ordered standard sizes today anyway. Goodyear eagle F1 assymetric 3.

RKM · Post by **RKM** » Fri Jan 18, 2019 3:07 pm

On this subject I have a question. I have a 2005 3.0i with M sport suspension. 18" wheels with 255 rear tires (tyres) and 225 fronts. Are the front/rear wheels the same width/offset or different for each axle?
Thanks

mr wilks · Post by **mr wilks** » Fri Jan 18, 2019 6:21 pm

RKM wrote: ↑Fri Jan 18, 2019 3:07 pm On this subject I have a question. I have a 2005 3.0i with M sport suspension. 18" wheels with 255 rear tires (tyres) and 225 fronts. Are the front/rear wheels the same width/offset or different for each axle?
Thanks

Assuming your wheels are oem 18s originally made for your car then the rears are 8.5j (et50) & your fronts are 8j (et47)

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