R33 Gtst S2 Front Rotor Thickness - 30 Or 32

[GeeDog]

Bought a set of the GKTech caliper spacers so we can run GTR rotors on the front of our R33 GTST Series 2, wiih the stock calipers.

I was trying to work out which rotors I need - obviously 324mm diameter, 5 x 114.5, 63mm bore, etc, but what thickness.

Our current rotors are 296 x 32mm thick, so I assumed I needed 324 x 32mm GTR rotors. I couldn't find a part number that had these specs, only 30mm thick ones.

Contacted GKTech to see what rotors they sell with the brackets, and they are RDA7701 - 324 x 30mm. They tell me that stock R33 GTST rotors should be 296 x 30mm, and they always use 324 x 30 with the brackets. Ours are 32 mm. As far as I know our calipers are stock, but GKTech say it's possible we have R32 GTR calipers & rotors. It's also possible that someone has simply fitted R32 GTR rotors with our stock calipers - fitting new pads was tight, but not overly difficult.

Can anyone tell me for sure:

1. What thickness are stock R33 GTST S2 front rotors?

2. How do I tell if my calipers are R32 GTR or R33 GTST?

3. Is there a 324 x 32mm GTR rotor available? What is the part number?

This is all doing my head in. Most of the manufacturers & resellers don't list rotor thicknesses. I have found conflicting info on the net, and don't know what to believe.

Any help is appreciated.

Thanks, Geoff

[GTSBoy]

It is very very simple.

Sumitomo GTR calipers are for 296x32mm rotors.

Brembo GTR calipers are for 324x30mm rotors.

Sumitomo R33GTST calipers are to suit 296x30mm rotors.

So spacing the GTST caliper out to suit the Bremo rotor is correct. 30mm caliper for 30mm rotor.

But it won't go on without grinding caliper away. Be warned.

[dan.1337]

I'm using DBA p/n dba4928s which is a 324x30mm on my Sumitomo GTS-T caliper with spacer.

It's the standard GTR rotor:

http://www.kudosmotorsports.com/catalog/dba-brake-rotor-set-front-dba-4000-series-slotted-dba4928s-nissan-skyline-r32-gtr-vspec-vspec-r33-gtr-r34-gtr-brembo-callipers-p-718.html

[GTRPSI]

Yes RDA7701 is 30mm thick.

RDA7701 is the GTR rotor.

There is no 32mm thickness version identical to that rotors hat size, hub hole size, PCD etc standard off the shelf.....

[GeeDog]

Thanks. So I wonder if we've got GTR calipers, or if someone has squeezed 32mm rotors into GTST calipers. Anyone know the sumitomo caliper part numbers, or another way to id them?

Regardless, I've ordered some 30mm GTR rotors.

[dan.1337]

If you post a pic of your calipers someone should be able to tell you what they are

[simpletool]

R32 GTR rotors and R33 GTSt rotors looks quite obviously different. Google image search them.

You'd have a tough time putting 32mm rotors onto GTST calipers, but it would be possible if it is PERFECTLY centered and the pads aren't too thick. Remember some pads are slightly thicker than others so there is room to play on the 30mm rotor, the 32mm rotor would take the margin of error out for fitting. Also, why bother? Just get the 30mm rotor. I'm using the ATTKD 324mm GTR rotor, fixed 2-piece curved vane. Fits great and is as light as the 296mm rotor. Using the UAS adapters, no grinding. Just using the DB1199 Toyota Landcruiser pads.