[MysteriousGas]

Hey I have a 435 x drive that will be lowered on eibach pro kit springs. Thinking of running 788m which are 19x9 and 19x10 and was wondering if 255/35or40 squared on those wheels will work. I know the rear will stretch a little bit but am also a fan of subtle tire stretch. Any help would be appreciated.

[alohasurftoad]

as you've already stated, the front will fit nice but the rear will be moderately stretched. if there's going to be stretch, it'll look better if the front is stretched and rear is not.

here is 255/35/19, stretched on 10 ET40 rear. personally, i don't like it
https://f30.bimmerpost.com/forums/sh...&postcount=293

since you're lowering, i suggest one of these two setups, either will NOT cause problem with x-drive

245/35/19(25.8")+285/35/19(25.7")
https://f30.bimmerpost.com/forums/sh...5&postcount=20
https://f30.bimmerpost.com/forums/sh...&postcount=321

or, recommend
235/40/19+265/35/19
https://f30.bimmerpost.com/forums/sh...&postcount=282

if you really want 255 up front, here an F30xdrive with 255/35/19+265/35/19 on 788M. it's at the 1% limit, still ok and less stretched at rear.
https://f30.bimmerpost.com/forums/sh...highlight=788m
.

[MysteriousGas]

Originally Posted by alohasurftoad

as you've already stated, the front will fit nice but the rear will be moderately stretched. if there's going to be stretch, it'll look better if the front is stretched and rear is not.

here is 255/35/19, stretched on 10 ET40 rear. personally, i don't like it
https://f30.bimmerpost.com/forums/sh...&postcount=293

since you're lowering, i suggest one of these two setups, either will NOT cause problem with x-drive

245/35/19(25.8")+285/35/19(25.7")
https://f30.bimmerpost.com/forums/sh...5&postcount=20
https://f30.bimmerpost.com/forums/sh...&postcount=321

or, recommend
235/40/19+265/35/19
https://f30.bimmerpost.com/forums/sh...&postcount=282

if you really want 255 up front, here an F30xdrive with 255/35/19+265/35/19 on 788M. it's at the 1% limit, still ok and less stretched at rear.
https://f30.bimmerpost.com/forums/sh...highlight=788m
.

Thanks for the info. Are you sure the first link you put was 255 squared? I saw the poster mention he’s on 245 and 265 on another post but I could be looking at the wrong one

[alohasurftoad]

Originally Posted by MysteriousGas

Thanks for the info. Are you sure the first link you put was 255 squared? I saw the poster mention he’s on 245 and 265 on another post but I could be looking at the wrong one

I think he has oem sizes, 225/40/19 front, 255/35/19 rear. My point was to show the 255 stretch on 10". If you touch a curb, the lip will protect the tire...��

edit...yes you are correct, it's 265/35/19 rear. the stretch with 255 will look even worse
.

[alohasurftoad]

https://f80.bimmerpost.com/forums/sh....php?t=1669858

Tire was mounted incorrectly in link above. Link below has 255/35 on 19"@ET40. Stretch doesnt appear too bad but it's not how i'd roll, regardless.

https://f30.bimmerpost.com/forums/sh...9&postcount=46
.

[MysteriousGas]

Originally Posted by alohasurftoad

https://f80.bimmerpost.com/forums/sh....php?t=1669858

Tire was mounted incorrectly in link above. Link below has 255/35 on 19"@ET40. Stretch doesnt appear too bad but it's not how i'd roll, regardless.

https://f30.bimmerpost.com/forums/sh...9&postcount=46
.

Another concern, do you think the 255 on those rims in the front would rub?

[alohasurftoad]

Originally Posted by MysteriousGas

Another concern, do you think the 255 on those rims in the front would rub?

https://f30.bimmerpost.com/forums/showpost.php?
p=25034037&postcount=257

@ ET29 tires will rub at full lock due to width or height. most 255/35/19 will NOT rub, however there's always a possibility it will graze the fenderwell liner during full-turn under compression and if the tire is broadly shaped, such as track tires. F36 gran coupes also seem to have most rubbing potential, as two members reported grazing fenderwell liner at full-lock with 235/40/19.

again, imo i'd still choose one of these staggered setups.
235/40/19+265/35/19 or
245/35/19+285/30/19 if lowered

they'll have least interference problems and the f&r diameter difference is easy on the x-fer case.

[MysteriousGas]

Originally Posted by alohasurftoad

https://f30.bimmerpost.com/forums/showpost.php?
p=25034037&postcount=257

@ ET29 tires will rub at full lock due to width or height. most 255/35/19 will NOT rub, however there's always a possibility it will graze the fenderwell liner during full-turn under compression and if the tire is broadly shaped, such as track tires. F36 gran coupes also seem to have most rubbing potential, as two members reported grazing fenderwell liner at full-lock with 235/40/19.

again, imo i'd still choose one of these staggered setups.
235/40/19+265/35/19 or
245/35/19+285/30/19 if lowered

they'll have least interference problems and the f&r diameter difference is easy on the x-fer case.

Thanks man, will keep you posted on what I decide on doing between 265 & 235 or 255 squared. I always had thought 285 was too wide since I thought max we can clear in the rear was 275 and eibachs only being so mild especially xDrive. I was aiming for the squared set up because I plan on tracking so I want neutral handling, better turn in over the stock 225 upfront, and ability to rotate the tires around the rims to maximize life. I probably should be doing squared rims to but also do enjoy the look of the 788m and want to keep an OEM+ look.

[alohasurftoad]

Originally Posted by MysteriousGas

Thanks man, will keep you posted on what I decide on doing between 265 & 235 or 255 squared. I always had thought 285 was too wide since I thought max we can clear in the rear was 275 and eibachs only being so mild especially xDrive. I was aiming for the squared set up because I plan on tracking so I want neutral handling, better turn in over the stock 225 upfront, and ability to rotate the tires around the rims to maximize life. I probably should be doing squared rims to but also do enjoy the look of the 788m and want to keep an OEM+ look.

255/35/19+265/35/19 would be the best street+track setup, as it is is mildly staggered/almost square, use non-directional tires for rotation across the axle. rotating the tires around the rims is inconvenient and would cost way too much unless you work at or own a tire center.

if you had the budget and facility(storage), it'd be way better to have a dedicated 18" track setup $2.3k for wheels/tires/tpms

[MysteriousGas]

alohasurftoad thanks for all your help! i finally got my 255 squared set up on the 788m. I like the back but the front is a little aggressive but can be due to the 4s thicker shoulders. They do rub up front occasionally under very certain circumstances but don’t think it is of worry.

[Patrcyx]

Originally Posted by MysteriousGas

alohasurftoad thanks for all your help! i finally got my 255 squared set up on the 788m. I like the back but the front is a little aggressive but can be due to the 4s thicker shoulders. They do rub up front occasionally under very certain circumstances but don’t think it is of worry.

That looks nice! BTW can I ask for what kind of rear spoiler you put on?

[MysteriousGas]

Originally Posted by Patrcyx

That looks nice! BTW can I ask for what kind of rear spoiler you put on?

Thanks! It’s a rw carbon spoiler. I’ve actually been debating taking it off so I would consider selling it if you made an offer. I’ve had it for two years and no signs of it yellowing. It’s also been ceramic coated