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I just thought i'd clarify a few things for you all.
The photos posted by 5 DOT 0 & gremlinsteve show the new DBA T3 Slot pattern. Its uni-directional so there is no need for a left or right based on the slot pattern. It does a couple of things; firstly it's quieter than our previous designs, secondly it has a bit more initial bite & thirdly it's easier to buy 2 of the same part number than have to buy 1 left & 1 right.
Onto the question post by steveespo
Do the slots cut through the edge of the disc? Looks close, can create a crack path.
The answer here is no, the outer slot does not cut through the edge and as you can see it has a significant lead in on the end of the slot so it gives maximum strength & thickness where a potential crack might form. The other thing to remember is that a crack from thermal stress (like you'd see with track or race use) will form 90 degrees to the rotational direction ie. it will crack straight down the friction face. If you see a crack form radially then its likely formed courtesy of lateral loading which is trying the bend the disc (cast iron doesn't bend "happily"), hub bearings are the big offender when you see lateral loading.
Below are the Old slot designs which cloud9 posted. These are being phased out to make way for the new T3 slot pattern.
Old 5000 Series
Old 4000 Series
Now for PeteInCT's turn.
Ask them why they don't make the DBA52124BLKS anymore... ;D
We do still make the DBA 5000 Series Clubspec T3 rotor - DBA52124BLKS. There has been a back log here in Australia which has pushed back the production of our next batch. No firm ETA yet but if you contact DBAUSA then they'll probably be able to point you to a distributor that has some.
Anyway I hope that answers some of your questions and clarifies a few points for you all. Cheers to 5 DOT 0 for allow DBA to come on here an give some further info (not all boards are so obliging).
Welcome to our forum, many of us have used DBA products and I for one are very happy with performance and wear rates. Thanks for posting the info and keep us up to date when the new rotors and rings hit the US. Can the new T3 rings be used on our old hats? Hope so.