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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Thu, Jul-12-2018, 02:27:28 PM   #101
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Default Re: Best BBK for E46 M3

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What's the issue with the smaller ones, reduced engagement of the hub shoulder in the wheel?
Yep-- especially when combined with the loads track tires (/tracking) puts on them.
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Old Thu, Jul-12-2018, 02:44:34 PM   #102
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Default Best BBK for E46 M3

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What's the issue with the smaller ones, reduced engagement of the hub shoulder in the wheel?

The biggest problem is while the hub lip is 10mm, most wheels have a chamfered bore.

With a 5mm spacer you might only have 1-2mm of engagement between the wheel bore and hub lip.

A 5mm to 9mm spacer is asking for trouble.


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Old Thu, Jul-12-2018, 02:52:20 PM   #103
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Default Re: Best BBK for E46 M3

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Yep-- especially when combined with the loads track tires (/tracking) puts on them.
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Originally Posted by bigjae1976 View Post
The biggest problem is while the hub lip is 10mm, most wheels have a chamfered bore.

With a 5mm spacer you might only have 1-2mm of engagement between the wheel bore and hub lip.

A 5mm to 9mm spacer is asking for trouble.


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Hmm okay.. makes sense. What exactly is that lip doing other than precisely locating the wheel against the hub? I wouldn't think it would really be under load during hard cornering, as the lug bolts/nuts are farther away from the wheel axis and already stressing the wheel against the hub..? Just trying to understand

Regardless, I doubt I would have issues running soft 225 winter tires. But still I was thinking of using for track too, Bimmerworld offers those used Hoosiers in 225/45/17
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Old Thu, Jul-12-2018, 02:55:40 PM   #104
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Default Re: Best BBK for E46 M3

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Hmm okay.. makes sense. What exactly is that lip doing other than precisely locating the wheel against the hub?

Thatís what itís doing. Thereís a lot of force going through the hub in multiple directions.

You might get by on the street not using hub centric wheels or spacers but it wonít last long on track before you at best get a nasty vibration. Iíd put money on one or more wheels coming off.


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Old Thu, Jul-12-2018, 03:23:26 PM   #105
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Default Re: Best BBK for E46 M3

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Thatís what itís doing. Thereís a lot of force going through the hub in multiple directions.

You might get by on the street not using hub centric wheels or spacers but it wonít last long on track before you at best get a nasty vibration. Iíd put money on one or more wheels coming off.


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Okay but even if the lip is only partially engaged with the wheel, aren't the lugs taking most all of the force from the road? Like I said they are much farther from the wheel axis so if the wheel is always flush with the hub at the lugs I don't imagine there's much movement where the wheel sits on the lip? What are the possible consequences for a minimally engaged wheel/lip under high loading conditions?
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Old Thu, Jul-12-2018, 03:32:04 PM   #106
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Default Re: Best BBK for E46 M3

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Okay but even if the lip is only partially engaged with the wheel, aren't the lugs taking most all of the force from the road? Like I said they are much farther from the wheel axis so if the wheel is always flush with the hub at the lugs I don't imagine there's much movement where the wheel sits on the lip? What are the possible consequences for a minimally engaged wheel/lip under high loading conditions?

Iím sure thereís some fudge factor designed but you really need to make sure you maximize the contact area.

The lugs just hold the wheel against the hub. Not sure what the term is but the hub is what keeps the wheel centered. If you didnít have the lip, your lugs would take most of the force. They wonít last long.

Theyíll bend back and forth as the wheel rotates and fail.


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Old Thu, Jul-12-2018, 03:36:42 PM   #107
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Default Re: Best BBK for E46 M3

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Iím sure thereís some fudge factor designed but you really need to make sure you maximize the contact area.

The lugs just hold the wheel against the hub. Not sure what the term is but the hub is what keeps the wheel centered. If you didnít have the lip, your lugs would take most of the force. They wonít last long.

Theyíll bend back and forth as the wheel rotates and fail.


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Ahh okay I guess I see. Particularly under braking I can see the hub lip doing a bit of work, but I'm sure in cornering too. I was under the impression the friction between the wheel and hub (caused by the lugs which are stressed) plays a big roll in keeping the wheel from moving around too but I could be wrong
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Old Thu, Jul-12-2018, 06:44:42 PM   #108
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Default Re: Best BBK for E46 M3

Apex says the 17x9 et30 should fit over the brakes, actually offering ~2mm more clearance over 17x9.5 et35. They think a 3mm spacer might work, sounds like the right route for me
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Discussing Best BBK for E46 M3 in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)