i found one source that said a crx had an ~7lb rotor. there appears to be a lack of precision with that weight so i come here to investigate the matter further. based on all the time i have spent looking at the wilwood rotors i would image the best solution would be a non-vented/solid rotor.
can anyone add a specific rotor weight that can act as a benchmark?
different rotors will weigh more or less depending on how much metal is in them and what alloys they use. some of the "premium" vented rotors will have thicker wear surfaces and weigh more than their cheaper counterparts..
Are you looking for the lightest rotor that meets a spec, or simply the lightest rotor?
The rears on my B13 SER Sentra are seriously tiny. And thin. And I think I paid about $12 each for new ones.
i will try and find a weight for those rotors tomorrow; thank you.
as for your question; i am looking for the lightest rotors.
http://brembo.mycarparts.net/
If you search by vehicle, in the images section is the CAD file with weight included.
1985 Chevy Sprint. And Rock Auto has some on sale right now for $5.44 each.
What's the intended application? I have 72 gram rotors on my mountain bike, but I don't think that's what you're after...
What is your application?
no-name Chinese made rotors (vented) (used... therefore a bit thinner than new) = 8.5 lb
2002maniac wrote: What's the intended application? I have 72 gram rotors on my mountain bike, but I don't think that's what you're after...
This. And what's the budget?
If it needs to be $cheap and available, the rears of something old, FWD, and light are probably the ticket.
1.6l NA miata rears?
Base Model Rabbits, Golfs, and Jettas have a 9.4" solid rotor that's pretty light.
If a mountain bike rotor isn't big enough, how about one off a low end sport bike like a GS500 or Ninja 250? They're fairly small, non-vented, and cross drilled, so they hardly weigh anything.
Motorcycle brakes would be a good, readily available choice. Another choice would be these: http://www.speedwaymotors.com/Sprint-and-Midget-Brakes.html but they do fail on the cost part, but excel in the light department.
thank you for the responses. i should be able to get some weights later today.
the application will be a sub 1900lb street car that makes it to the drag strip a couple times a year, at best. i had prepared myself to spend the money with wilwood on aluminum hats and rotors but am now considering the topic of this thread as a compromise. if i can get some stock rotors within about 1.5lbs of what i was going to assemble i will likely abandon the wilwood brake project.
the only rotor i was able to weight today were the fronts(vented) for a cx and vx; it weighed in at 9lbs and 9 ounces. i will try and get some more weights in the coming days.
ditchdigger wrote: http://brembo.mycarparts.net/
According to Brembo, 1990 Miata rear rotors weigh 2.6kg (5.7 lbs) while 1992 Sentra 1.6 rears weigh 2.3kg (5.0 lbs) each. I don't think there is going to be a stock application rotor that is much lighter than that.
Seems to me there is an almost direct correlation between rotor weight and stopping power. Not quite, but almost.
Maybe not the primary target point for weight reduction on a race car. 
mith612 wrote:.
when i used that link the other day i never clicked on the part number and then the images to get a weight. thank you for the post and thank you ditchdigger for the link.
Smart car? They used tiny non vented front rotors.
You'll need to log in to post.
