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Heya,

So this may be a dumb question, but better safe than sorry. I have a 2000 996 C4, I am putting 996 GT3 wheels on it. The rears are 18x11 et63, I understand et45 is for wide body cars. My question is this. Will I need new lug bolts moving to this size? Or since the offset is correct will I be ok? I have searched and have not been able to find anything conclusive, and I just want to be safe.

Thanks much

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The only factor to consider when choosing the size (length) of lug bolts is the distance from the outside face of the center of the wheel (the surface against which the bolts exert pressure) to the outside surface of the disc rotor.

If that distance has not changed, there is no reason to change the size of the lug bolts.

Longer bolts are needed when you install spacers, which necessarily increase the distance.

Regards, Maurice.

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Hi, I have the same car and I was under the impression that those wheels will not fit without rolling the rear fenders? Can you confirm?

Also +1 on posting a pic or two.

Thanks

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Heya,

I will post pics when I put em on again, they are in desperate need of new tires, and I have em off waiting for the new tires. As for fit i they went on no problem at all, had zero rub. One thing I did notice was that the speedometer was off when i tested em out. The tires on the rears are 295/30/18. The wheels are beautiful, I actually have an extra set of rears, but they are et45 so for a wb.

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Heya,

I will post pics when I put em on again, they are in desperate need of new tires, and I have em off waiting for the new tires. As for fit i they went on no problem at all, had zero rub. One thing I did notice was that the speedometer was off when i tested em out. The tires on the rears are 295/30/18. The wheels are beautiful, I actually have an extra set of rears, but they are et45 so for a wb.

Funny that you bring up the speedometer issue. Mine was spot on, gps checked, when I had 19" wheels on my 2000 996. I just went back to stock spec'd 18" wheels and speedometer is reading 5mph high compared with gps. How does one calibrate a Porsche speedo? Dealer thing?

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Wheels look nice. I noticed a long time ago that my speedo always reads 3 MPH too high when to pass one of those "Your Speed is ..." indicators on the side of the road. I was told that 996 speedometers are supposed to always read 3 MPH high at all speeds.

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Wheels look nice. I noticed a long time ago that my speedo always reads 3 MPH too high when to pass one of those "Your Speed is ..." indicators on the side of the road. I was told that 996 speedometers are supposed to always read 3 MPH high at all speeds.

i just noticed that yesterday! then stumbled across this post looking for wheel spacer info. however, looks like mine 'your speed is' is 4mph lower than my speedo -

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If you speedometer indicated 45 when you were doing 50 the manufacturer could be sued and NHTSA would love to sock them with a $$BIG FAT fine$$.

Manufacturers are just protecting the posterior. And of course saving your life because, "SPEED KILLS"!!

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