[Shah_F30]

Can I put 225/40/18 on front and 235/40/18 on the rear?

Currently square set up of 225/40/18 with 397 18” x 8’ wheels?

[alohasurftoad]

Originally Posted by Shah_F30

Can I put 225/40/18 on front and 235/40/18 on the rear? Currently square set up of 225/40/18 with 397 18” x 8’ wheels?

OEM diameter = 26"
225/40/18=25.1"
235/40/18=25.4"

you can put on a smaller diameter, but why? although dig acceleration will improve from shortened gearing and smaller sidewall will have quicker turn-in response, it will be less comfortable, increase fenderwell gap 0.3-0.5" from OEM, requiring lowering and increase speedo/odometer error where speedo will read higher than actual and odometer will accrue more mileage than actual.

on 18x8 397's the tire sizes i'd use are 235/45/18(26.3"), 245/40/18(25.7"), or OEM size 225/45/18(26.0")
.

[Shah_F30]

Originally Posted by alohasurftoad

OEM diameter = 26"
225/40/18=25.1"
235/40/18=25.4"

you can put on a smaller diameter, but why? although dig acceleration will improve from shortened gearing and smaller sidewall will have quicker turn-in response, it will be less comfortable, increase fenderwell gap 0.3-0.5" from OEM, requiring lowering and increase speedo/odometer error where speedo will read higher than actual and odometer will accrue more mileage than actual.

on 18x8 397's the tire sizes i'd use are 235/45/18(26.3"), 245/40/18(25.7"), or OEM size 225/45/18(26.0")
.

Thank you bro, you always been so supportive and logical in your responses.

I hope my daughter will like it as this is not my 335i.

Mine is other one 335i with 513M wheels

[alohasurftoad]

Originally Posted by Shah_F30

I hope my daughter will like it as this is not my 335i.

definitely 245/40/18 or 235/45/18 for the red 335i. i'd probably do 245/40/18 for max grip

https://f30.bimmerpost.com/forums/sh...d.php?t=831520
https://f30.bimmerpost.com/forums/sh...1634952&page=2

[Shah_F30]

Originally Posted by alohasurftoad

definitely 245/40/18 or 235/45/18 for the red 335i. i'd probably do 245/40/18 for max grip

https://f30.bimmerpost.com/forums/sh...d.php?t=831520
https://f30.bimmerpost.com/forums/sh...1634952&page=2

Awesome shares. 🙏

[jmanB45]

Originally Posted by Shah_F30

Can I put 225/40/18 on front and 235/40/18 on the rear?

Currently square set up of 225/40/18 with 397 18” x 8’ wheels?

If the red pic is current, those tires are the stock size, 225/45/18

[Shah_F30]

Originally Posted by jmanB45

If the red pic is current, those tires are the stock size, 225/45/18

Yes, You are right I typed it wrongly above. 😌

[danb1979]

235/45/18s all round on both 18x8 405Ms (Goodyear Assym 6s as summers) and 18x8 397s (Goodyear Vector Gen3 all seasons for winters)

405Ms:



397s:



Don't waste your time with staggered tyres on a straight set of wheels; just go one size wider than OEM so they're not stretched

235s offer a straighter sidewall better rim protection and better tyre contact patch with the road!

[nikogeor]

Originally Posted by danb1979

235/45/18s all round on both 18x8 405Ms (Goodyear Assym 6s as summers) and 18x8 397s (Goodyear Vector Gen3 all seasons for winters)

405Ms:



397s:



Don't waste your time with staggered tyres on a straight set of wheels; just go one size wider than OEM so they're not stretched

235s offer a straighter sidewall better rim protection and better tyre contact patch with the road!

Looks sick

[danb1979]

Originally Posted by nikogeor

Looks sick

Thank you

Even better now I've just had a full suspension overhaul on it; every single piece replaced bar 2 of the rear arms

Sits perfectly now on the new Bilstein shocks & Eibach springs