Aftermarket rear brake rotor

[davejenknz]

After much research (OEM, aftermarket 2nd hand etc) I've decided to install an aftermarket rear brake rotor on my S4.

The rotor has the same diameter and bolt holes as the OEM item  but is 5mm thick against 4mm for the OEM.

As fitted everything seems OK, nothing fouling. However the extra 1mm thickness has reduced the clearance between the rotor and the caliper mounting plate and of course the rotor bolts and the speedo pickup.

I can't see that there would be any problems with this setup. But if anyone can then I may consider getting the rotor machined to 4mm.

FYI I've replaced the OEM rotor because it was worn (3.4mm). I suspect that the previous owner was a cruiser rider as the front rotors are mint.

[Desmostro]

What kind of rotor is it? Some rotors require specific pads to go with it. That can be important I hear.
I'd call the manufacturer and ask the best way to deal with this before seriously eff'ing it up machining it etc.

[Jobu]

1 mm isn't gonna make much difference back there.  If you can spin the wheel by hand and get a rotation or two out of it, then you're good to go.

That's mine opinion anyway.  But I tend not to worry about stuff like that too much.  If you rotors/rear wheel eats shit, don't blame me. 

[Speeddog]

As long as the bolt heads don't whack the sensor, it's OK on that issue.

Which disc did you get?

[davejenknz]

My local Duc dealer sold me a Metalgear http://www.metalgear.com.au/ rotor.

According to the dealers Metalgear  catalog, the rotor fitted a variety of bikes.

After I fitted the rotor I checked Metalgear's web site and found a rotor specifically for the S4. 

Unfortunately the rotor is now scuffed after several rotations (courtesy of a sintered pad) so I can't return the 'generic' rotor and get the S4 specific one.

The dealer also sold me a DP pad kit as the pads supplied with the rotor did not fit the brembo caliper.

[woodyracing]

damn, its a lot cheaper just to have your stock rotor drilled.  Looks just as good and is just as light
btw: wow, how do you wear down a rear rotor???  thats nuts

[Speeddog]

damn, its a lot cheaper just to have your stock rotor drilled.  Looks just as good and is just as light
btw: wow, how do you wear down a rear rotor???  thats nuts

Previous owner likely ran the pads down to the metal backing plate... that will wear the rotor out in a hurry.