Anybody know of an aftermarket floating rotor that is the OE size?
Thanks

 

like a motorcycle rotor?

i havent seen that on a car before, lol

 

Only a few of the BBKs are full floating.
They have some benefits but are also somewhat cost prohibative to some. (um, that would be me...)

As for a stock rotor of this design I'm not sure the benefits would really justify the cost. While they'd be more constant in expansion and more tollerant of run out, the mass would remain the same (or nearly) and the diameter offer no torque value change.

I (and others perhaps) would be willing to dig a bit deeper into it for you on a special order. Don't be shocked however when the bill comes up to be about $650-700 for a set. And yes, those are pretty realistic (if not favorable) numbers.

 

... and they can be a bit noisy, no?

 

Depends. Yes the more 'hard core' racing ones actually go 'clunk-clunk-clunk' when you push them. The rotor falling around the button.

Most of the later street set ups have a more refined spring set up which dampens the movement. Of course as they are used more the buttons wear and the noise can come back.

 

Ok guys, you are on the right track however I will have to say that the price you quoted is a little out of range I believe. I race BMW's for a team in LA and I can tell you that a brand new set of Euro floating rotors for the M3 does not even cost that much and they are the stock size, so there has to be someone out there that is making the same thing. Not trying to hurt feelings at all just letting you know where I come from and what I am looking for. And in using them on my street M3 I dont hear anything from them nor a clunk-clunk-clunk. But I would lovce to hear what others have to say. Thanks

 

Send us a link.

I'd be up for what and who produces a floating rotor package for "not even close to that". Sounds to me as if you've found your source why don't you ask them?

I can only speak from experience in saying that most two piece replacements of bolted design run about $500 per pair. Floters cost more money to produce the hat, more to produce the rotor and the buttons are costly over the bolts. Perhaps you've hit some source I should be in touch with too.


*** In case someone thinks I'm blowing smoke here. I pulled up the Wilwood data on floating parts.

Hats: $235ea
T buttons: 112ea
Rotors: 95ea (guessing on a close size)

That's $342 x 2 or $684.
Being a nice guy and knowing 'nobody pays retail', I'd peg it at about $595.
And that's ASSUMING the parts offer the proper offset and rotor to caliper fit. They won't off the shelf, I know better. Thus you are faced with both custom hats and custom rotors. Of limited run and amortized sale.

I'm curious to see what you come up with. Speak with StopTech and see what they will offer you. $20 says I am within $50.


****Found them. BimmerWorld. $295ea.

 

I have the Euro floating rotors on my E36 M3 and pay around $120 each for them. However that's for production parts made in some volume. Aftermarket floaters from specialists like StopTech run at least twice as much as that.

Neil
05 MCS
96 M3

 

*Real* floating rotors are noisy because the rotor sits loosely within the carrier. They might not go clunk-clunk, but they will probably rattle some when rotating freely, and/or may make some weird noises under braking.

Most floating rotors seen on motorcycles these days are semi-floating and use flexible spacers/washers to hold the rotors firmly in the carrier, mainly to reduce noise. The design does allow for some self-alignment. Some Ducatis may have full floaters but none of the Japanese bikes have 'em. I know some guys take the time to remove the washers, which seems like a complete waste of time to me...

I don't see the point for anything other than a full race machine, and even then would question if it's really much of an advantage. Might be good for a 10th or two? The top guys in a class could probably make use of gaining a 10th.

 

True. Well said.

The benefits are not so much them being floaters alone. The real benefit comes if you can use an alternate rotor rather than the one piece. This opens the door to two piece replacements which can offer an altered air gap or wall thickness. And most are directional where the stocker is not. The only benefit to it being a floater is that the expansion is better controlled. And on a rotor this small, pushed that hard...it might not be a bad thing for sure.

In the end a stock sized rotor floater or not won't have any significant impact on the brakes system that I could justifiy the price tag. To fit the stock caliper it must be no larger in diameter and no wider in width. Its capacity is nearly the same. Granted cooler running may aide the pads a bit however this is no sub for a more efficient system overall. Forgive me, but I see it as a bit more of a band-aide solution. Some race series require stock size parts and here it may prove worthwhile.

 

http://www.stoptech.com/faq/data/faq18.html

Stoptech refers to theirs as floating rotors. They are very quiet:smile: