[JamesCook16]

I've got a 2017 440i xdr with the track package and i cracked a rim today so I'm gonna buy after markets. I've heard that you need to be careful with sizes so any insight would be helpful. I decided on 18x8.5 +35 with 245/45R18 for the front 2 and 18x9.5 +35 with 275/40R18 for the rear 2. I have the stock staggered ones 225/255 currently and my main goal is to up the width and keep the 18 inch size. Does this sound like a decent setup? i don't know anyone who can explain to me what calculations you need to make so i kinda just winged it. The rim im looking at is Konig Hexaforms and Pilot sport 4s tires.

[alohasurftoad]

Originally Posted by JamesCook16

9kI've got a 2017 440i xdr with the track package and i cracked a rim today so I'm gonna buy after markets. I've heard that you need to be careful with sizes so any insight would be helpful. I decided on 18x8.5 +35 with 245/45R18 for the front 2 and 18x9.5 +35 with 275/40R18 for the rear 2. I have the stock staggered ones 225/255 currently and my main goal is to up the width and keep the 18 inch size. Does this sound like a decent setup? i don't know anyone who can explain to me what calculations you need to make so i kinda just winged it. The rim im looking at is Konig Hexaforms and Pilot sport 4s tires.

imo the rear offset is too low. 275/40/18 is beefy, will poke at ET35 and may even rub under compression. Since both front and rear tires are taller and thicker sidewalled than OEM, if you are not lowered, it will have a beefy, semi rally cross-ish look.

235/45/18 265/40/18 is the tallest id use.

Post pics after 245/45+275/40 is installed

[JamesCook16]

I am not lowered currently, i just got the car not too long ago but i plan on it. sorry for my ignorance this is my first time buying rims, what does "ET" mean. I was recommended the 275 width because the car is tuned and such and i want to reduce spin, but i dont want any rubbing problems. i can lower it accordingly in the future.

[alohasurftoad]

Originally Posted by JamesCook16

I am not lowered currently, i just got the car not too long ago but i plan on it. sorry for my ignorance this is my first time buying rims, what does "ET" mean. I was recommended the 275 width because the car is tuned and such and i want to reduce spin, but i dont want any rubbing problems. i can lower it accordingly in the future.

offset is how much the wheel pokes out or tucks in. the lower the number pokes out more. +35 aka ET35 is the offset on your wheel specs.

if you are going to lower it and run 275/40/18, +42ish would be better. 7mm doesn't sound like much but, there'll be a big difference.

[JamesCook16]

I might have to go for a different rim then, I'm having a hard time finding those rims with that offset

[JamesCook16]

Best I can find that look similar would be Enkei TS-7s
I can't change the offsets on tire rack but it's 18x8.5 +38 for the front and 18x9.5 +45 rear.
Does that sound right for 245/45R18 275/40R18 or should I change up the tire size

[alohasurftoad]

Originally Posted by JamesCook16

Best I can find that look similar would be Enkei TS-7s
I can't change the offsets on tire rack but it's 18x8.5 +38 for the front and 18x9.5 +45 rear.
Does that sound right for 245/45R18 275/40R18 or should I change up the tire size

Everything will fit better. If desired you may add spacers if you want less offset, which may be determined later.

[JamesCook16]

So they don't have tires in the size I need on tire rack so I've lowered the front to 245/40R18

My final fit i think is gonna be

Enkei TS-7s with Michelin Pilot Super Sports
18x8.5+38 245/40R18 for the fronts
18x9.5+45 275/40R18 for the rear

As long as changing up the one number doesn't mess up too much I think this is what I'm gonna go with. To my understanding that's the sidewall height correct?

[JamesCook16]

Tire size.com says I can't do that actually, back to the drawing board

[JamesCook16]

I think I'm going to switch to continental extreme contacts so I can get 245/45ZR18 front and 275/40ZR18 rear for the Enkei TS-7s I mentioned above. Sound good?

[alohasurftoad]

imo it's gonna look ph@t and make it look like 17's, but if you don't mind it or maybe you want that look then enjoy. fyi it is going to dull the turn-in and heighten your gearing at the pavement, if you care.

https://f30.bimmerpost.com/forums/sh...=245%2F45%2F18

since you are lowering, if you want width, then i'd do 245/40/18+275/35/18, like leadfoot12
https://f30.bimmerpost.com/forums/sh...0&postcount=65
https://f30.bimmerpost.com/forums/sh...9&postcount=91
.

[JamesCook16]

Oh wow that looks money, thanks so much I'm gonna try and get as close as possible to that

[JamesCook16]

Ok, I tried my best and fitment industries looks like they have what I'm gonna go with. Sorry for the so much back and forth but I really have no clue how to translate numbers to on car effect/appearance.

Going back to the konigs and pilot sports
18x8.5+38 245/40R18 fronts
18x9.5+45 275/35R18 rear

And to my understanding the higher the offset the more pushed in the tire will be so I can get spacers to even it close to what he has/what looks good correct? The only thing I can't do is go with 18x9 on the fronts I don't think they make the konigs like that but it shouldn't be a huge issue.

[JamesCook16]

If they rub alittle untill I get spacers it's not a huge deal, I'm just kinda on a time crunch cause I gotta drive around my car on a cracked rim until they show up. My other car is down.
I should also say thank you, you have been such a help trying to help me understand all this in a rush

[JamesCook16]

I got the rims and put em on finally. Front has a 1/4" spacers rear has none and the fit is great. I do have to contact Fi and talk with them because I had an issue with the calipers. The wheel weight they put on hit the caliper and scratched the front barrels. Overall everything else looks and feels great

245/40R18. 18x8.5 +38 +1/4" Spacer
275/35R18. 18x9.5 +45