why spacer not compatible with beveled surface?

[billyk]

Hi all,

I'm looking at the possibility of using a 3mm or 5mm spacer at the front when I mount Kosei K1 17" wheels on my E92.

H&R said "H&R Hubcentric wheel spacers (pair). Fits over the stock BMW hub lip... mm Spacers require you have a flush mounting surface on your wheels.
Wheels with a beveled mounting surface are not compatible with these spacers"

I'm not 100% sure, but I believe both the OEM and the K1 has "beveled (http://www.turnermotorsport.com/image/wheels/wheel_hub.jpg)" surface. Anyone know what's the reason of "incompatibility"?

Thanks
Billy

[Orient330iNYC]

Hi all,

I'm looking at the possibility of using a 3mm or 5mm spacer at the front when I mount Kosei K1 17" wheels on my E92.

H&R said "H&R Hubcentric wheel spacers (pair). Fits over the stock BMW hub lip... mm Spacers require you have a flush mounting surface on your wheels.
Wheels with a beveled mounting surface are not compatible with these spacers"

I'm not 100% sure, but I believe both the OEM and the K1 has "beveled (http://www.turnermotorsport.com/image/wheels/wheel_hub.jpg)" surface. Anyone know what's the reason of "incompatibility"?

Thanks
Billy

my guess is that the centerbore wont engage the hub fully because of the chamfer. hench why they stipulate a non beveled centerbore on the wheel.
3&5mm spacers dont have their own hub extension, do they?

[billyk]

From the photo on the H&R site, the 3mm and 5mm spacers don't have hub extension. They have beveled surface. So I don't understand why they are "not compatible".

[Orient330iNYC]

From the photo on the H&R site, the 3mm and 5mm spacers don't have hub extension. They have beveled surface. So I don't understand why they are "not compatible".

i'm guessing here, but the beveling pushes the actual centerbore out by another 1-2mm (that is, from the back face of the wheel to the point at which the centerbore is the proper diameter)
that combined with the spacer gives probably only 1-2mm of mating surface.