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16" wheels

17" wheels

18" wheels

[chrisgixer]

Although the rats boys seem happy with them.
http://translate.google.co.uk/translate?hl=en?sl=no&tl=en&u=http%3A//www.rats.no/omega_tg.html

[serek]

Hmmm... A possible. Can't find any sizes though.

http://www.ebay.co.uk/itm/Front-Right-Brake-Disc-for-Audi-A6-02-05-/380721731667?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item58a4c89853

this what i have for my calipers
http://www.ebay.co.uk/itm/FRONT-Ferodo-Brake-Discs-Audi-A8-4-2-TDI-quattro-4E-2002-2010-Saloon-/271021235743?pt=UK_CarsParts_Vehicles_CarParts_SM&fits=Car+Make%3AAudi%7CModel%3AA8&hash=item3f1a1fde1f

[chrisgixer]

Looking at these, specifically the reverse, there doesn't appear to be a way to replace the rotor. The alloy top hat/centre has studs protruding into the cast rotor, and don't appear to come apart to allow keeping the top hat and replacing the rotor once worn.... How the hell do they make these?

Surely the two parts can be separated?

[aaronjb]

Those are almost exactly like the M3 brakes (beside the scolloped outside edge, the BMW discs are round) - you can't separate the two 'halves' as they're not really halves..

They're cast as one piece AFAIK, but designed that way presumably to aid heat dissipation and reduce the chance of distortion.

Also makes them chuffing expensive if they're anything like BMW!

[Entwood]

Looking at these, specifically the reverse, there doesn't appear to be a way to replace the rotor. The alloy top hat/centre has studs protruding into the cast rotor, and don't appear to come apart to allow keeping the top hat and replacing the rotor once worn.... How the hell do they make these?

Surely the two parts can be separated?

Surely that can't be true .. as any such studs would prevent the rotor from rotating !!  ... or am I misreading what you wrote ??

Are they locating pins for transit/fitting that are removed on fit ??

[05omegav6]

Those 'pins' are essentially spokes

Discs wouldn't work very well if the hubs were separately independent

[chrisgixer]

Why would the rotor need to rotate Nige? It needs to not rotate to stop the car.

It can't be one piece, as the centre is Alloy although I see your point Aaron, and the braking part of the disk, the rotor, is cast iron. Therefore they must be assembled, and therefore de assemble. But how ?

[Broomies Mate]

The alloy hub is moulded over the Iron Disc, forming one piece. 

[chrisgixer]

Unless the studs are cast into the rotor, and then the alloy cast around the studs? As Broomies says.

But then how would that cope with expansion rates as the rotor gets hot?

[chrisgixer]

All the after market rs6 brake upgrades I've see. Have some sort of release mechanism for the two parts for replacement, so the alloy centre is kept, but the outer rotor replaced when worn.
 I had assumed these oe rs6 had similar on the back as no nuts or bolts where visible from the front. But the back reveals nothing.

They must be, effectively, one piece. Which sucks ! I was hoping new rotors only would be needed once worn. Making them cheaper long term.

[chrisgixer]

Those are 8 pot calipers btw. With 4 pads pre caliper.

[05omegav6]

Right...

All these discs are Rotor only, will have separate hub mounting bell in anodized alloy. Assume plus VAT.

Monaro VXR set up...
315x18 rear discs will be made to order, price tba.
330x32 front discs AP £213.31, DBA £262.96.

Monaro upgrade/VXR8 set up...
343x28 rear discs AP £233.60, DBA £262.96.
362x32 front discs AP £196.79, DBA N/A for UK order.

As suspected DBA discs need to be ordered from Australia, hopefully from stock

[chrisgixer]

How much for the bells Al?

[05omegav6]

Guessing on £25-35ea for the fronts, perhaps £35-50ea for the rears

Depends entirely on the amount of aluminium needed for each one, and ease of machining... so won't know until the parts are measured properly:-\

[chrisgixer]

Well, I'd prefer a two piece disc on grounds of weight and heat transfer.

So if the cost can be kept to that sort of level, it should be worth a few quid extra over a solid disc. We'll see how we go.

Saves machining hubs to Master.