ilko

I love it when I get brand new spanking parts (thanks to MS Road & Race). These rotors look so good, they should be in a museum! They are massive, the pictures don't do them justice. It's going to be a fun weekend in the garage

Busta Rib

Wow, very nice!! What are the specs? How much?

ilko

These are the two-piece 993TT rotors for the Big Red calipers. Pelican has them for $450-ish a piece.

CWay27

No way!! I was just about to order a set of 965 through vertex. Was this a one time deal??? So the 993 rotors fit just fine??

ilko

Hi Carl, the 965 and 993TT rotors have the same dimensions: 322x32. The advantage of the 993TT rotors is that they are 1) floating and 2) lighter because of the aluminum hat. PM me if you want to buy a set and I'll give you the scoop.

ThomasC2

what's the part number? 993.351.046.10?

Bill Verburg

They are not floating and they have steel hats.

965 and 993tt do have the same 322x32 annulus dimensions but AFAIK they are not interhangeable due to a slightly different o/s.

We've been trying to get to the bottom of this for a while and need someone w/ 965 to accurately measure that rotor's o/s

CWay27

Bill, what do you suspect?? since o/s is different, will I wear a pad more than the other??

Bill Verburg

If the rotor o/s is different it will not be centered in the caliper throat.

Ilko has both and will measure for us.

CWay27

o/s aside, where do you buy just the rotor once you're up for a new set and how many set can you go through before changing the hats??

ilko

Guys, the difference is 6mm. The hat of the 965 rotor is taller by 6mm.

Here's some pics:

Bill Verburg

Ilko, thanks that's perfect
to use the 993tt as is the best thing to do is to swap for 993 uprights & struts as described here or change the hats for some shorter ones

CWay27

Yeah I wish I had 2K laying around to change the uprights and everything involved. How about a 6mm thicker bracket or could a 6mm spacer worked with longer bolts? Same idea has a wheel spacer!!

Bill Verburg

just an FYI, I believe that 928GTS 322x32 rotors will work.

and

928 S4 304x32 wil work w/ the shorter 993 front calipers

Bill Verburg

I just pointed out what would be best, not necessarily what most will chose to do.

other issues of the 964 steel upright w/ adaptor vs 993 aluminum w/o adaptor. not mentioned here, are weight and stiffness