anonymousagain

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?

dprantl

Most wheels are designed and tested the way they are. If you mill off a lot of material from the center of the wheel, how do you know how much to take off before the wheel is no longer structurally sound? It is a risk not many are willing to take. Most wheels do not have a lot of material there to begin with.

Dan
'91 928GT S/C 475hp/460lb.ft

EspritS4s

See the other active thread about modifying/repairing wheels. I don't think that anyone is going to recommend milling off a half an inch from the center of the wheel.

James Bailey

the lug nut holes are drilled and acorned......mill off the mounting face and your nuts have far less material holding them on....and you might not like that ! Having the wheel fall off is a bad thing... Also some spokes do not have much clearance for the brake caliper .

BPG_Austin

I'd considered the possibility of doing this. (Nice to work in a CNC shop sometimes..) If the right wheels come in my possesion at the right price I might try taking a bit off. Nothing more than an idea at this point though.. And there would be a lot to consider as stated above.

Mike Simard

NO! There's not enough meat to do that if you look at a typical wheel. Not even a little, don't even think about it.

You can always have custom CCWs made for the same cost of the used, broken, welded, painted-to-hide wheels that were discussed earlier.

Having wider outter rims put on something good like a forged Porshe wheel like Todd could be a good reliable way to make a cool as hell wheel.

anonymousagain

Really appreciate everyone's feedback --> definitive "you'd be stupid to do so" will be applied here.

...will have to just keep looking for the right offset.

IcemanG17

Kurt
I wouldn't do it.....

But there are plenty of wheels out there for fair prices that allow BIG tires......with minor fender rolling you can run common 18x10x65mm wheels all around with 275's no problem..even bigger in the rear if you take the spacers off

Tom. M

I'm not a machinist.. but it seems from my observations.. that this is what Porsche did with the 8 inch wide Club Sport rims. I've seen 52mm offset 8" CS rims..and when compared to my GT's 8" CS rims....the area looks to be milled off.

James Bailey

Perhaps but the lug nutholes were drilled and shaped AFTER the machining...

andy-gts

colorado custom wheels

bimmen325

I have seen forged wheels getting made and the only thing they do is mill the back to the needed offset.
the cost of designing a different wheel for each offset size is not practical. I'm almost 99.9% sure that almost every manufacturer does this.

dprantl

Sure, but the wheels they design have a maximum allowable milling amount that has been stress tested. Refer to another recent thread where there is a limit to the positive offset possible for most custom 3-piece wheels.

Dan
'91 928GT S/C 475hp/460lb.ft

hacker-pschorr

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.

bimmen325

hence the .1%