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  #21  
Old 10-11-2020, 09:11 PM
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Location: Ohio
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Purplefade is on a distinguished road
Spec X5 Overland Build

Awesome project and you wonít regret the Grabber ATX - had a set on an old Bronco that just couldnít be stopped! Great straight on traction on flat ground and you can saw them back and forth in the mud and take advantage of the aggressive side walls


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Last edited by Purplefade; 10-11-2020 at 11:21 PM.
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  #22  
Old 10-14-2020, 12:07 PM
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Join Date: Feb 2012
Location: Canada
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soursamo is on a distinguished road
Wow looks fantastic! Great job and complete info.
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  #23  
Old 10-21-2020, 11:42 AM
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Join Date: Aug 2020
Location: Los Angeles
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Hub Centric Rings

I initially installed the new Cragar Soft 8 wheels straight onto the X5 to see if I really needed hub centric rings.

Hub centric rings are designed to fill in the gap between the hub of the car and the center bore of the wheel. Most aftermarket wheel manufacturers design their wheels with a centerbore large enough to fit a wide variety of cars. These wheels have a larger center bore diameter than the hubs of most the vehicles they are made to fit onto.

As such, the wheels are mounted "lug centric" as the wheel lugs are the only thing keeping the wheel centered on the hub whereas stock BMW wheels will always have a very close fit between the center bore of the wheel and the diameter of the hub to more accurately center the wheel.

The concern is that a lug centric installation can result in wheel vibration because the wheel is not accurately centered on the hub.

Which is exactly what I found. With the lug centric installation, I would feel a vibration most pronounced at around 50-60mph. It felt exactly like a wheel out of balance.

Then I installed a set of hub centric rings to fill the gap between the wheel and the hub. This provided a very snug fit and centered the wheel to the hub. The result was that the vibration disappeared and the wheels/tires drove perfectly.

Hub centric rings come in sizes to meet almost every application. In the my case, I needed rings with a outer diameter of 83.82mm to fit the wheel and an inner diameter of 72.5mm to fit the X5 hub. I was able to order a set in this size from Amazon at a cost of less than $10.

The rings are constructed of a very hard plastic material. Installation is easy, they simply install over the hub and the wheel goes outside of that.

Here is a pic of the hub centric rings installed:
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  #24  
Old 10-21-2020, 11:55 AM
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Join Date: Feb 2012
Location: Canada
Posts: 7
soursamo is on a distinguished road
I got some 285/75/18 General Grabbers installed yesterday. Very tight in the back so put on a small slip on spacer. Will check the turning clearance in the front!
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  #25  
Old 10-21-2020, 12:13 PM
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Join Date: Sep 2016
Location: USA
Posts: 351
Bdc101 is on a distinguished road
Quote:
Originally Posted by thstone View Post
Hub Centric Rings

I initially installed the new Cragar Soft 8 wheels straight onto the X5 to see if I really needed hub centric rings.

Hub centric rings are designed to fill in the gap between the hub of the car and the center bore of the wheel. Most aftermarket wheel manufacturers design their wheels with a centerbore large enough to fit a wide variety of cars. These wheels have a larger center bore diameter than the hubs of most the vehicles they are made to fit onto.

As such, the wheels are mounted "lug centric" as the wheel lugs are the only thing keeping the wheel centered on the hub whereas stock BMW wheels will always have a very close fit between the center bore of the wheel and the diameter of the hub to more accurately center the wheel.

The concern is that a lug centric installation can result in wheel vibration because the wheel is not accurately centered on the hub.

Which is exactly what I found. With the lug centric installation, I would feel a vibration most pronounced at around 50-60mph. It felt exactly like a wheel out of balance.

Then I installed a set of hub centric rings to fill the gap between the wheel and the hub. This provided a very snug fit and centered the wheel to the hub. The result was that the vibration disappeared and the wheels/tires drove perfectly.

Hub centric rings come in sizes to meet almost every application. In the my case, I needed rings with a outer diameter of 83.82mm to fit the wheel and an inner diameter of 72.5mm to fit the X5 hub. I was able to order a set in this size from Amazon at a cost of less than $10.

The rings are constructed of a very hard plastic material. Installation is easy, they simply install over the hub and the wheel goes outside of that.

Here is a pic of the hub centric rings installed:

To get wheels to work without hubcentric rings, you have to have wheels made for either conical or sleeved lug nuts/bolts. Flat lug bolts or nuts won't center the wheel with the adequate tolerance to avoid vibration. It looks like your wheels aren't made to work in a lugcentric installation at all.
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  #26  
Old Yesterday, 04:01 PM
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Join Date: Jan 2020
Location: Vancouver Island
Posts: 25
alberniken is on a distinguished road
Can I get in on this?

Half-way there. Got the mud covering and KO2's



Planning external spare tire carrier and front/rear bush bumpers


K
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  #27  
Old Yesterday, 08:36 PM
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Join Date: Apr 2009
Location: Ohio
Posts: 897
Purplefade is on a distinguished road
Iíve told my wife that Iím keeping my E53 forever so that I can lift it and put mudders on it when I finally get my E70 5.0i

Making solid progress, keep up the good work and I love the mud coat, solid proof that the tires are doing there job


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