I'm wondering the same thing about the stock Speed3 wheels. I just got 235/40/18 Bridgestone RE-01R and they weigh 27lbs each. Estimating my new rims will be ~18lbs each, that'll make my new combo ~45lbs. I'm wondering how much weight I'm saving if any.

 

how much do RX8 rims weigh anyway?

I know stock speed 3 is 24lbs

RX-8 should be around that same range...its only 1 inch wider but same 18 inch diameter

 

[quote author=steven88 link=topic=139019.msg2996517#msg2996517 date=1237174618]
how much do RX8 rims weigh anyway?

I know stock speed 3 is 24lbs

RX-8 should be around that same range...its only 1 inch wider but same 18 inch diameter
[/quote]


When I did the switch, I weighed my stock MS3 wheel and it was 21.5 pounds. The RX8 wheel weighed 24 pounds.

 

24lbs isn't a terribly heavy wheel. Its not light by any means but if I were to put these on I wouldnt worry too much about the weight.

 

Guess I just have a slow MS3 then

 

My last rims were 24.5 lbs. Yikes, I couldn't wait to get rid of those lead shoes. My current rims are 20.8. It's amazing what a difference a few pounds at the wheels make.

 

[quote author=danielj link=topic=139019.msg2997055#msg2997055 date=1237214955]
My last rims were 24.5 lbs. Yikes, I couldn't wait to get rid of those lead shoes. My current rims are 20.8. It's amazing what a difference a few pounds at the wheels make.
[/quote]

I agree. Back when I had my probe gt I drove it in winter and my winter wheels/tires were way lighter than my summer tires/wheels and I always noticed the difference right away when the winter wheels went on or off the car.

 

I weighed one of my rx-8's at around 22lbs. Not bad but not great (especially considering my other set weigh 15 lbs... talk about night and day difference!)

 

[quote author=Mica07ms3 link=topic=139019.msg2996836#msg2996836 date=1237203362]
[quote author=steven88 link=topic=139019.msg2996517#msg2996517 date=1237174618]
how much do RX8 rims weigh anyway?

I know stock speed 3 is 24lbs

RX-8 should be around that same range...its only 1 inch wider but same 18 inch diameter
[/quote]


When I did the switch, I weighed my stock MS3 wheel and it was 21.5 pounds. The RX8 wheel weighed 24 pounds.
[/quote]

Are you sure you don't have that backwards? My RX8 wheels weighed about 21.5 lbs before I got them powdercoated, and about 22 lbs after. I've always heard that the stock MS3 wheels are heavier than RX8's.

 

If you really want to get better straight line acceleration go to a light weight 17 lb forged 17" wheel and a lighter tire.you could save 7 to 8 lbs per corner.

 

my forged MS Rays weigh 7.7kg

 

How do you get a light weight tire? I've never even seen weight listed in the specs for them, but maybe it's because I wasn't looking for it.

 

I might be looking for some new 18's. Problem is I am so picky about the way wheels look, I don't like 99.9% of the ones I've seen. :|

 

[quote author=halo0 link=topic=139019.msg3004883#msg3004883 date=1237492442]
How do you get a light weight tire? I've never even seen weight listed in the specs for them, but maybe it's because I wasn't looking for it.
[/quote]

Tire Rack does list weight in the tire specs. I didn't used to look for it either, but the differences in tire weight can be very surprising and can make more difference than wheel weight since they are on the outside edge of the rotation.

 

[quote author=cali_axela link=topic=139019.msg3004995#msg3004995 date=1237495244]
[quote author=halo0 link=topic=139019.msg3004883#msg3004883 date=1237492442]
How do you get a light weight tire? I've never even seen weight listed in the specs for them, but maybe it's because I wasn't looking for it.
[/quote]

Tire Rack does list weight in the tire specs. I didn't used to look for it either, but the differences in tire weight can be very surprising and can make more difference than wheel weight since they are on the outside edge of the rotation.
[/quote]

I was thinking about that the other day actually, I bet the difference of a single pound in tire weight is more significant than a 5 pound difference in wheel weight. My mechanical engineering coursework is so buried in my brain at this point however that I don't recall how to calculate it

 

I'm pretty sure I read the MS3's are heavier than the RX8s.

Rx8's with tires seems real close to the 17's IMO.

 

expensive lighter wheels will lower your 1/4 ever so slightly, drag radials or slicks will help significantly!!!!