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Old 10-24-2006, 09:17 PM   #1
Legacy
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Default Changing offset by milling - safe ?

I've wondered if this would safely work since I went from VW to Subaru. I had a mint set of Kosei wheels on my Jetta. Both the Subie and the Jetta are 5x100 but the offsets are different. Since the VW offset (38) sticks out further than the Subaru what I want to know is Could I have a metal shop mill the wheel to change the offset to a "Subaru-friendly" offset such as 48 ?

It sounds simple enough, remove enough material and you can correct the offset. However, will this work and would it be safe ?
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Old 10-25-2006, 12:12 AM   #2
Web Foot STi
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Is there 10mm of thickness of extra material in the wheel flange?

How well can the machine shop index off the tyre bead to the hub face to keep things true?

The first is an engineering judgment / wheel design issue. The second is just flat dam hard to do. For 4 rims.

Better off to sell the VW wheels and buy some that fit your Subaru.
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Old 10-25-2006, 12:17 AM   #3
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You funny.


From an engineering standpoint, the RED FLAGS are waving. I'm curious how many wheel engineers would cringe at your statement.

Um...DANGER, DANGER Will Robinson!


I'm just saying...10mm is A LOT, getting close to half an inch.
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Old 10-25-2006, 02:05 AM   #4
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Doctor Smith:

"Go a head Will. It's cheap and easy..."

Given automotive wheel design there might be 10mm in the flange...

There is a reason that offset is critical. Both for wheels and hubs. Let alone king pin offset...
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Old 10-25-2006, 09:58 AM   #5
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NO!!!!

When we machine the wheels, the PCD hole depth is dependent on the offset. When you remachine the mounting face 10mm, you will essentially lose the PCD hole depth and your nuts will nut reach minimum thread engagement.
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Old 10-25-2006, 10:39 AM   #6
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Quote:
Originally Posted by rota wheels wrx View Post
NO!!!!

When we machine the wheels, the PCD hole depth is dependent on the offset. When you remachine the mounting face 10mm, you will essentially lose the PCD hole depth and your nuts will nut reach minimum thread engagement.
I understand the mounting surface as the surface that touched the hub. So if one mills away 10mm of the the mounting surface material on the wheel, why would the thread engagement decrease? It should increase because the wheel material thickness is 10mm less and the studs protrude further out from on the wheel.

Unless he is talking about milling away the road side of the wheel, which would not make any sense to do.

Either way, it's unsafe to do.
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Old 10-25-2006, 08:18 PM   #7
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Interesting comments guys , so Mr. Rota you're saying you drill the lug holes after the wheel is milled for offset ?
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