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Tire & Wheel Forum
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Old 06-21-2019, 02:19 PM   #1
Radski69
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Changing my wheels set up

Changing my wheels/ set up
Hey guys, I'm new here and have a couple questions. I just got my first e46, it's s 2003 330i with the sport package. I've got style 72 wheels on it now, but want to switch to a 17 inch set. The style 68 is common for this, but I wanted to inquire about using style 44 and style 162 for a square set up. I'm still gonna want two sets of wheels and tires either way, one for summer and one for winter. I guess the question is if I will need any spacers to run a square set up with either of the rims I mentioned. I'm aware that I need a 45 sidewall and 40 sidewall profile front to back respectively. Just curious about the width. Thanks in advance for any help/ input.
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Old 06-21-2019, 10:58 PM   #2
HayWagon
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Why are you after a different sidewall height on a square setup?


Sent from my tractor.
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Old 06-21-2019, 11:20 PM   #3
Radski69
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Why are you after a different sidewall height on a square setup?


Sent from my tractor.
The car is set up to run shorter tires in the rear, to the best of my knowledge. Right now it's 225/40-18 in the front and 255/35-18 on the back.

Last edited by Radski69; 06-21-2019 at 11:21 PM.
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Old 06-22-2019, 09:06 AM   #4
HayWagon
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Quote:
Originally Posted by Radski69 View Post
The car is set up to run shorter tires in the rear, to the best of my knowledge. Right now it's 225/40-18 in the front and 255/35-18 on the back.
No, all tires must have the same rolling diameter.

A 225/40 and a 255/35 are the same diameter. Sidewall is a ratio vs the width, not an absolute value.

A square setup is having four identical tires and wheels.
To run a square setup using your two suggestions, you would need to find two sets of the rims and only use the front or the rear wheels for two sets.
It can be done, but may need spacers for the skinny rims in the rear. You may also run into rubbing in the front with the wider rim. I run style 68s in a square setup by using four "rear" 8.5 rims.
You can look up specs on bmwwheelstyles and do some math to figure out what would need to be done to get the correct offset in the rear with the skinny rim.

Sent from my tractor.

Last edited by HayWagon; 06-22-2019 at 09:18 AM.
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Old 06-23-2019, 02:33 PM   #5
Radski69
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Quote:
Originally Posted by HayWagon View Post
Quote:
Originally Posted by Radski69 View Post
The car is set up to run shorter tires in the rear, to the best of my knowledge. Right now it's 225/40-18 in the front and 255/35-18 on the back.
No, all tires must have the same rolling diameter.

A 225/40 and a 255/35 are the same diameter. Sidewall is a ratio vs the width,
not an absolute value.


A square setup is having four identical tires and wheels.
To run a square setup using your two suggestions, you would need to find two sets of the rims and only use the front or the rear wheels for two sets.
It can be done, but may need spacers for the skinny rims in the rear. You may also run into rubbing in the front with the wider rim. I run style 68s in a square setup by using four "rear" 8.5 rims.
You can look up specs on bmwwheelstyles and do some math to figure out what would need to be done to get the correct offset in the rear with the skinny rim.

Sent from my tractor.
Thanks for the information/ explanation about the sidewall value being a ratio to the width. I wasn't aware of that, now I've got a better idea of how to proceed. Hope you're having a great weekend.
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Old 06-23-2019, 05:40 PM   #6
HayWagon
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Quote:
Originally Posted by Radski69 View Post
Thanks for the information/ explanation about the sidewall value being a ratio to the width. I wasn't aware of that, now I've got a better idea of how to proceed. Hope you're having a great weekend.
Happy to help.
Sun out, sheep frolicking in the paddock, chickens clucking and an e46 broken down to about 200 parts in the shed. Pretty good weekend.
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