Getting my car ready for the glen next week, decided to weigh the stock wheels/tires vs my track setup(19" corsas R cmpds on c4s lobsterforks). All tire sizes exactly the same, these are the gt3rs tires.
Stock front w/ bstones 44.5lbs
lobster w/ corsa 39.0lbs
stock rear w/ bstones 64.0lbs
lobster w/corsas 54.0lbs
that's a total of 31lbs less rotating mass, probably meaningless on a 3400# street car, but interesting none the less.
C

 

I think you meant rotating mass, but we know what you meant, and I find that significant. I predict you may notice some difference in quicker response to initial turn in. One of the reasons some of us went for PCCBs.

 

just caught that, thanks.

 

That is a big difference...and as Terry said, you should feel the difference. My OEM TT wheels and PS2's weigh in at 207.4 - sounds like the bstones may be heavier than PS2's.

 

They feel like they weigh a ton, even more than my snow tires.

 

It is significant because it is unsprung weight that is being reduced. Please give us an update after your track date.
BTW, what is a "lobsterfork" ?

 

The stock 997s/4s rims.

 

Here's a pic:

 

Now I understand. Never did like those wheels but they are lighter so good for the track.