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E46 Convertible
The E46 vert forum. Talk about dropping your E46 top here.

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Old 01-28-2014, 10:24 PM   #1
AquilaBMW
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Wheel and Tire Sizing on E46 Vert

Hi There -

I am searching around trying to figure out wheel fitment for my car. I desperately want to replace the aftermarket wheels on the car.

I was able to acquire a set of 18" Beyern Mesh Wheels: http://www.beyernwheels.com/BMW_whee...n_typemesh.php


They were on a 128i which shares bore size and off set with the E46. These particular wheels are:

FRONT - 18 x 8.5 / ET 40 / 5 x 120 Bolt Pttrn / 72mm Hub

REAR - 18 x 9.5 / ET 45 / 5 x 120 Bolt Pttrn / 72mm Hub

I plan on reusing the 225 / 45 tires from the current rears on the front, but I am stumped on what to get on the rears. I read that 255 / 35 or so is the way to go, but there are potential under-steer issues with this kind of set up. I am also wondering if a 275 / 35 tire would work on the rears?

Any input would be appreciated.

Thanks!

Last edited by AquilaBMW; 01-28-2014 at 10:29 PM.
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Old 01-29-2014, 10:25 AM   #2
Cabrio Bob
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Quote:
Originally Posted by AquilaBMW View Post
I plan on reusing the 225 / 45 tires from the current rears on the front
the size 225/45 you mention is not a valid size for the E46, it should be 225/40

and I don't have any issues with my setup
Beyern spartan chrome
front 18x8.5 ET40 225/40
rear 18x9.5 ET45 255/35

Last edited by Cabrio Bob; 01-29-2014 at 11:00 AM.
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Old 01-29-2014, 01:46 PM   #3
AquilaBMW
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Quote:
Originally Posted by Cabrio Bob View Post
the size 225/45 you mention is not a valid size for the E46, it should be 225/40

and I don't have any issues with my setup
Beyern spartan chrome
front 18x8.5 ET40 225/40
rear 18x9.5 ET45 255/35

Hmmm..... I will need to re-check that tire size and verify. Thanks for the heads up. I am still wondering about the 275 in the rear though.... think it will work?

I figured I will just spend the $15 to mount it and test one whee & tire for fitment.
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Old 01-29-2014, 03:23 PM   #4
taylor192
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Why do you want a wide rear tire? If it is just for looks then the 255 is perfect, a 275 is overkill.
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Old 01-29-2014, 03:37 PM   #5
AquilaBMW
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Originally Posted by taylor192 View Post
Why do you want a wide rear tire? If it is just for looks then the 255 is perfect, a 275 is overkill.
I just happen to have two nearly new Potenzas in the garage and would rather use them than fork out money if I don't have to..

The wheels on the car right now use studs and also require hub rings. While I don't mind the stubs - I noticed when I removed the one rear wheel that the hub hub does not sit flush and you have to torque it down firmly to make it flush. My guess is this is crushing the hub ring and contributing to my slight high speed vibration.

I would like to take the wheels off ASAP! If I can use the 275, then I can expedite this and mitigate my costs.
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Old 01-30-2014, 12:07 AM   #6
AquilaBMW
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Quote:
Originally Posted by Cabrio Bob View Post
the size 225/45 you mention is not a valid size for the E46, it should be 225/40

and I don't have any issues with my setup
Beyern spartan chrome
front 18x8.5 ET40 225/40
rear 18x9.5 ET45 255/35
I checked and you are right, the car has 225 / 40 / 18 all round.
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Old 02-03-2014, 07:53 PM   #7
hisport
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Hub rings??

Sounds sketchy. Are these PO "universal fit" wheels? Agree you should lose them, though square tire set up is not bad

Netherlands gave you correct tire fitment with the 128 wheels

Your (stock?) 325 will plow (understeer) big time with that tire stagger. For $$, you may be able to tune some of this out, but still not ideal with 325 suspension geometry. Be careful in the rain
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Old 02-03-2014, 08:07 PM   #8
Poncho@home
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That staggered tire size is optional on the E46. I run those tire sizes 225/40/18 & 255/35/18 and th car feels perfect.

Square setup has advantages, but the look of the staggered setup is nice. Plus on the staggered wheels you mention the 225 must be stretched on the 9.5" wheel
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Old 02-03-2014, 08:16 PM   #9
hisport
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E46 m3's, and some ZHP 330's, came with staggered setups and the suspension geometry/tuning to make them work

E46 325's did not

Yes; you can put big staggered wheels/tires on any car, but that doesn't mean that it will handle well, or even safely

I've instructed in some of these boy racer specials at track events, and typically they will plow right through the apex

Can you retrofit ZHP or M3 suspension into a 325? yes, but its a bit expensive
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Old 02-04-2014, 11:17 PM   #10
AquilaBMW
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Well.... I installed the Bayerns. I had to stretch both front and rear tires. Not really keen on that, but it will work for now. I am now running 225 /40/18 Front and 255/35/18 Rear. Car drives so much better with these wheels than the ones on it before. It is pure night and day.
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