It has been done, this is what i found when searching few weeks back.
Its totally illegal, after much searching and phonecalls, I came to realise that no one in Australia would do it.
Every shop I called would say the same thing. If it fell apart, I could be killed (expecially if hurtling along at 120+MPH).
A performance shop in Sydney was able to orchestrate the work for me though. I had to go through them, and from there I now know the wheels were shipped to Labrador, Queensland to be done.
(You might be able to work out who might have done it, as I since have, but am not going to name the place publicly).
I specified that I wanted to extend the 8" wheel to 9".
I could have gone as large as I wanted. I was thinking about 9.5" but didn't want to have clearance issues.
As the process only affects the inside of the wheel, not the hub placement, you will need some spacers. I had custom spacers machined up.
As my inner edge was now 25.4mm closer to the strut, I had 15mm spacers made, and then had to subsequently machine the right hand side in to be a 12.5mm spacer to stop rubbing.
Guards were rolled aswell.
As stated elsewhere, it was about $700 for the widening and shipment of two wheels. (this included the costs of two 17" wheels being cut up aswell - remember you need 4 wheels to make 2 wider ones).
About $700 for two Mickey Thompson 17" 275's and I think $80 for custom spacers. Plus associated fitment of rubber costs aswell.
Not exactly a cheap process. You could probably get two second hand 17" 3-piece simmons and then have appropriate offset in the width youu want made for the same money.
I however wanted to be stealth, so chose the same alloy rims that I drive around with everyday.
The alloy rims are precision welded on both sides of the rim, and in reality should be bloody strong.
I only got them for drag racing, so figured that in a straight line, they would be reasonably safe. I definitely wouldn't do circuit work on them - but I am a bit of a worrier
The performance shop reckoned they would be fine to use as a daily driver, but the roads in sydney are so bad, i'd never chance it.
I do however (on my two trips to the drags) put them on at home, and don't need to worry about changing tyres.
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