Anyone milled a wheel to the correct offset for front fitment?
03-24-2011, 09:35 AM
#16
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I've measured over two dozen wheel's including my friends Fikse's.
All of them had just under 1/2" (12.7mm) of "meat" between the hub face and the lug nut.
Most (if not all) wheels the lug holes are drilled last which creates the step for the lug nut / bolt to sit on.
If wheels were made with a common lug hole arrangement then simply machined down for offset, a problem with stud length would come into play.
All of them had just under 1/2" (12.7mm) of "meat" between the hub face and the lug nut.
Most (if not all) wheels the lug holes are drilled last which creates the step for the lug nut / bolt to sit on.
If wheels were made with a common lug hole arrangement then simply machined down for offset, a problem with stud length would come into play.
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David Schardt
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Forgeline Motorsports
3522 Kettering Blvd.
Dayton, Ohio 45439
http://www.forgeline.com
David Schardt
President
Forgeline Motorsports
3522 Kettering Blvd.
Dayton, Ohio 45439
http://www.forgeline.com
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03-24-2011, 09:47 AM
#17
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I recall Todd's TT in Green Bay using stock 16" wheels, with a section added to the middle to create a wider wheel to house the 315's, but has anyone used a mill to modify wheel offset?
Example:
Why not take an 8.5" ET52 and have a machine shop mill it to ET 65, so it will fit the front appropriately?
Is there a a concern for taking 13mm off the backside of the wheel? Perhaps less material, say 8mm would be acceptable?
Any insight?
Example:
Why not take an 8.5" ET52 and have a machine shop mill it to ET 65, so it will fit the front appropriately?
Is there a a concern for taking 13mm off the backside of the wheel? Perhaps less material, say 8mm would be acceptable?
Any insight?
What I think you could consider is first having the bottom of the lug recesses welded up to build us substantial additional metal for a new shallower lug nut location, then mill the holes out on the inside so they are located exactly and to the desired depth and shape, then finally milling off the back face to the desired offset.
Sounds simple, but will be a lot of work. Too, this kind of welding is difficult, but is commonly done on the inside of aircraft cylinder heads for repair and reconstruction.
Jerry Feather
03-24-2011, 09:53 AM
#18
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The answer to all the 928 wheel craziness is simple:
Spend some money and get custom correct offset wheels.
You won't regret it. Just spend less than you did for the car...
Then the obsession with wheel shopping will end, and you will get your life back. It worked for me.
Spend some money and get custom correct offset wheels.
You won't regret it. Just spend less than you did for the car...
Then the obsession with wheel shopping will end, and you will get your life back. It worked for me.
03-24-2011, 11:09 AM
#19
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03-24-2011, 12:35 PM
#20
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JB reminds us that caliper clearance is also a concern, even if there were no issues with the lug nut area. The wheels do flex a little under hard cornering/braking loads, so that 8-10mm clearance you have now shrinks a bit. For sure you don't want negative clearance numbers under any circumstances.
03-24-2011, 08:06 PM
#21
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again, great input guys. Can't imagine reducing the 1/2" to anything safe for mounting and this answers my Q that there is not enough material to work with for any modification.
Jerry - considered the welding path and have someone that is capable, but it's some work and I can't see myself trusting the end result at full-tilt anyway.
dr bob - good catch of Jim's comment that I missed...hadn't considered that spoke location is relevant to offset, which would clearly be compromised.
Brian and others - ya, I know to just buy the wheels I want, but the birds circle my head and make too much noise, which gets me thinking for creative ways to generate a solution. Besides, you never know when you figure out something for everyone's benefit...and asking Q's are free :-)
Jerry - considered the welding path and have someone that is capable, but it's some work and I can't see myself trusting the end result at full-tilt anyway.
dr bob - good catch of Jim's comment that I missed...hadn't considered that spoke location is relevant to offset, which would clearly be compromised.
Brian and others - ya, I know to just buy the wheels I want, but the birds circle my head and make too much noise, which gets me thinking for creative ways to generate a solution. Besides, you never know when you figure out something for everyone's benefit...and asking Q's are free :-)
03-25-2011, 12:47 AM
#22
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I wouldn't mill any wheel mounting areas or even run spacers on wheels.Best to buy a wheel with the right offset.Remember when I first heard of 928gts using wheel adapters I was surprised on that.
03-25-2011, 12:14 PM
#24
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Didn't expect to see them on a $90K car,how many high dollar cars come like that from the factory?Guess it was cheapier to space them than do updates to the car in the last years of production.
