Weight reduction
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,108
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
I think people have a mis-conception of the true tire weights as I hear many talk about BIG reductions moving from OEM run-flats. 
GS/Z06 tire sizes
OEM fronts= 29lbs
OEM rears= 34lbs
Other options (OEM sizes):
(Fronts)
Michelin SS= 25lbs (-4)
Michelin PS2= 31lbs (+2)
Bridgestone run-flat= 31lbs (+2)
Goodyear G2 run-flat= 28lbs (-1)
(Rears)
Michelin SS= 32lbs (-2)
Michelin PS2= 35lbs (+1)
Bridgestone run-flat= 37lbs (+3)
Goodyear G2 run-flat= 32lbs (-2)
So the Michelin SS provides the biggest weight reduction with a four corner total of -12lbs. Twelve lbs is twelve lbs but I think many think they're dropping 20+lbs most of the time; obviously not the case.
*Just an informative post with facts for reference. Not knocking on anyone.
GS/Z06 tire sizes
OEM fronts= 29lbs
OEM rears= 34lbs
Other options (OEM sizes):
(Fronts)
Michelin SS= 25lbs (-4)
Michelin PS2= 31lbs (+2)
Bridgestone run-flat= 31lbs (+2)
Goodyear G2 run-flat= 28lbs (-1)
(Rears)
Michelin SS= 32lbs (-2)
Michelin PS2= 35lbs (+1)
Bridgestone run-flat= 37lbs (+3)
Goodyear G2 run-flat= 32lbs (-2)
So the Michelin SS provides the biggest weight reduction with a four corner total of -12lbs. Twelve lbs is twelve lbs but I think many think they're dropping 20+lbs most of the time; obviously not the case.
*Just an informative post with facts for reference. Not knocking on anyone.
Drifting
Joined: Feb 2012
Posts: 1,258
Likes: 66
From: San Luis Obispo, California
When I looked up the weight of the Gen-1 F1 Runflats I was surprised how much heavier they are than the Pilot SS's, so yes 4 tires & 4 rotors combined @ 48lbs.
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,108
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
Care to post the specific source of your info?
Noticing any part of a 48# weight reduction will be mostly felt by the person involved in the process of changing the rotors, not when driving the car.
Sr.Random input generator
Joined: Jan 2008
Posts: 7,811
Likes: 2,237
From: Sammamish, WA
According to Leavinu the tires are -12# and the Z06 forum shows a -11# for DBA5000 fronts. That's 23#, which leaves a 25# reduction for the rear rotors. Since the stock rears are 19.9# each, the BDA5000 rears would have to weigh 7.4# each to total a 48# saving.
Care to post the specific source of your info?
Noticing any part of a 48# weight reduction will be mostly felt by the person involved in the process of changing the rotors, not when driving the car.
Care to post the specific source of your info?
Noticing any part of a 48# weight reduction will be mostly felt by the person involved in the process of changing the rotors, not when driving the car.
Le Mans Master
Joined: Oct 2006
Posts: 5,078
Likes: 19
From: Cumming, GA
Just food for thought before spending the money on them.
Tech Contributor
Joined: Jul 2002
Posts: 14,950
Likes: 266
From: St. Louis, MO
St. Jude Donor '08
The first weight reduction options I recommend is to get GTO spares up front and take out the passenger seat. Those two items alone got me a very consistent 1.5-.2 and about 2 mph, weather independent.
Melting Slicks
Joined: May 2008
Posts: 2,802
Likes: 38
From: A galaxy far, far away...
St. Jude Donor '12 thru '26
According to Tire Rack tire weights & OEM size base car tire sizes. Changing from the stock F1's to non-runflat PS2's saves a total of 14#'s in rotational weight 
BTW - oldmansan, as he mentioned above, has a great small battery write up here in C6 tech
BTW - oldmansan, as he mentioned above, has a great small battery write up here in C6 tech
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Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,108
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
That's a bigger story than every 100# reduction is worth a tenth in the quarter and 1 more MPG.
I can pretty much guarantee you can't feel a 48# difference or even a 100# difference. Just like you can't feel a tenth in the 1/4 mile.
Sr.Random input generator
Joined: Jan 2008
Posts: 7,811
Likes: 2,237
From: Sammamish, WA
Is this the old rotating mass story that no one seems to know the real numbers?
That's a bigger story than every 100# reduction is worth a tenth in the quarter and 1 more MPG.
I can pretty much guarantee you can't feel a 48# difference or even a 100# difference. Just like you can't feel a tenth in the 1/4 mile.
That's a bigger story than every 100# reduction is worth a tenth in the quarter and 1 more MPG.
I can pretty much guarantee you can't feel a 48# difference or even a 100# difference. Just like you can't feel a tenth in the 1/4 mile.
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,108
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
The frame is lighter, but the rotors, calipers, wheels, and tires are heavier. Kinda makes you wonder about the rotating weight theory, doesn't it?
Safety Car
Joined: Sep 2007
Posts: 4,359
Likes: 6
From: Los Alamitos California
St. Jude Donor '09
Is this the old rotating mass story that no one seems to know the real numbers?
That's a bigger story than every 100# reduction is worth a tenth in the quarter and 1 more MPG.
I can pretty much guarantee you can't feel a 48# difference or even a 100# difference. Just like you can't feel a tenth in the 1/4 mile.
That's a bigger story than every 100# reduction is worth a tenth in the quarter and 1 more MPG.
I can pretty much guarantee you can't feel a 48# difference or even a 100# difference. Just like you can't feel a tenth in the 1/4 mile.
San
Sr.Random input generator
Joined: Jan 2008
Posts: 7,811
Likes: 2,237
From: Sammamish, WA
This is no theory; have you every heard of the term "moment of inertia"? If not, what about momentum? OK if still not, have you heard of those flywheels that replace the passenger seats in prototype hybrid-racer Porsches being tested, where the flywheel is used to store energy instead of batteries? Do you know how on Earth it stores energy in a flywheel? My guts are telling me your guts would not believe in such a wizardry.
Last edited by X25; Sep 14, 2012 at 02:54 AM.
Safety Car
Joined: Sep 2007
Posts: 4,359
Likes: 6
From: Los Alamitos California
St. Jude Donor '09
http://www.shoraipower.com/
San
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,108
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
I was talking about GM choosing to jack up pricing of Z06 by about $10K just to remove 100 lbs; was not comparing it to Grand Sport.
This is no theory; have you every heard of the term "moment of inertia"? If not, what about momentum? OK if still not, have you heard of those flywheels that replace the passenger seats in prototype hybrid-racer Porsches being tested, where the flywheel is used to store energy instead of batteries? Do you know how on Earth it stores energy in a flywheel? My guts are telling me your guts would not believe in such a wizardry.
This is no theory; have you every heard of the term "moment of inertia"? If not, what about momentum? OK if still not, have you heard of those flywheels that replace the passenger seats in prototype hybrid-racer Porsches being tested, where the flywheel is used to store energy instead of batteries? Do you know how on Earth it stores energy in a flywheel? My guts are telling me your guts would not believe in such a wizardry.
Moment of inertia? Oh yeah! I think it was 7th grade the first time I heard it. Understood the principle way before I knew the name. Maybe by being a mechanical engineer and designer for so many years it causes me to forget some of those basics.
NOT!Google French bus flywheel power to see some real world vehicle applications that existed about 50 years ago.
Stick around for a while, there's a lot to learn here.
Sr.Random input generator
Joined: Jan 2008
Posts: 7,811
Likes: 2,237
From: Sammamish, WA
Do a little research on the difference between a Z06, a GS, and a base Vette. $10K for 100#???
Moment of inertia? Oh yeah! I think it was 7th grade the first time I heard it. Understood the principle way before I knew the name. Maybe by being a mechanical engineer and designer for so many years it causes me to forget some of those basics. NOT!
Google French bus flywheel power to see some real world vehicle applications that existed about 50 years ago.
Stick around for a while, there's a lot to learn here.
Moment of inertia? Oh yeah! I think it was 7th grade the first time I heard it. Understood the principle way before I knew the name. Maybe by being a mechanical engineer and designer for so many years it causes me to forget some of those basics.
NOT!Google French bus flywheel power to see some real world vehicle applications that existed about 50 years ago.
Stick around for a while, there's a lot to learn here.
If you know what moment of inertia means, it makes your ignorance of it even more nonsense. Oh, and I am also an engineer. Keep rolling on the floor
Le Mans Master
Joined: Oct 2006
Posts: 5,078
Likes: 19
From: Cumming, GA
Thanks. The next battery I'll purchase will be a Shorai. I have one in my ZX10R and not only did it save major weight, but it doesn't need a battery tender. Best battery I've ever used.
http://www.shoraipower.com/
San
http://www.shoraipower.com/
San
Will that thing even crank a C6? I checked out the page and dont see anywhere to identify a "car" battery. Interesting battery, never heard of it before.
Last edited by LEAVINU; Sep 14, 2012 at 09:31 AM.
Le Mans Master
Joined: May 2011
Posts: 5,022
Likes: 18
From: Tampa FL (formerly Justinjor)
Tech Contributor
St. Jude Donor '11-'12-'13-'14
This is getting interesting.
And just for the record, I can 'feel' a tenth of a second in the quarter mile. I've made enough passes in my car to know when I've made a good pass and when the car is feeling strong.
And just for the record, I can 'feel' a tenth of a second in the quarter mile. I've made enough passes in my car to know when I've made a good pass and when the car is feeling strong.
Tech Contributor
Joined: Jul 2002
Posts: 14,950
Likes: 266
From: St. Louis, MO
St. Jude Donor '08
I know the difference between a 1.6 60 foot and a 1.5 for sure. If that hood drops you're sunk. You want to feel like you are pulling a wheelie through the launch process.
Melting Slicks
Joined: May 2008
Posts: 2,802
Likes: 38
From: A galaxy far, far away...
St. Jude Donor '12 thru '26
Thanks. The next battery I'll purchase will be a Shorai. I have one in my ZX10R and not only did it save major weight, but it doesn't need a battery tender. Best battery I've ever used.
http://www.shoraipower.com/
San
http://www.shoraipower.com/
San