Brake rotor assistance required

[jmw76]

Hi Guys,

I am trying to locate replacement brake rotors for my little race car.
I believe that they may be off a GS1000 or similar. Probably from a dual front disc set up.

The basic specifications are as follows:
1) outer rotor diameter 250mm
2) friction area is stainless steel an riveted to a centre section
3) centre hub section is cast Aluminium (9 spokes. Rivets attach outer disc to spokes) with a slight dish to it.
4) centre PCD (where it fixes to wheel is based on a 6 bolt pattern that I think is on centres of 78mm or so.
5) the fricton area is sloted with an alternating pattern of 2 and 3 slots arranged in a staggered, tangential pattern.
6) the disc thickness is 5mm.
7) RH and LH disks are the same but the central hub is riveted on the alternate side of the SS friction area/ring.
8) the mounting face for the hub is ofset from the centre line of the friction area by about 10mm.

Does anyone recognise this rotors?
Does anyone know of a replacement that I could use? It would be nice to go to a floating set up but I can only tolerate an OD of 250mm.

http://www.asfphotos.com/upload/1288482158.jpg


Any assistance would be greatly appreciated.

Cheers

Peter.

[Large]

I reckon the slots might be a red herring, cut in afterwoods

[jmw76]

Hi Large,
The slot patern looks identical to old photos I have looked at of GS bikes around 1980/81.
I think most were 275mm though and not 250mm. Maybe one of the smaller bikes in the range ran 250mm.
The rear brakes on some models were 250 but that wouldn't explain why both my left and right brakes are the mirror image of each other. Implying that they were from a front bake set.
???????

[Large]

Hi Pete,

They look a bit like the CB750 rotors that I keep seeing over at Extreme Creations on their CR750 build but the pic is from the wrong side.

Any chance of a clearer pic from the "outside" of the disc, or inside as yours are mounted?

[jmw76]

Hi Large,
Here are some images from different angles.
The rear view is what you would normally see when looking directly at the rotor on a bikes wheel.
It's a lttle hard to visualise with all the suspension components around it.
Cheers
Peter.

http://www.asfphotos.com/upload/1288517990.jpg


http://www.asfphotos.com/upload/1288496247.jpg

[probike]

is this them
http://cgi.ebay.com.au/LTR-BRAKE-DISC-REAR-SUZUKI-GSX-750-KATANA-S-POP-UP-/250655783083?pt=AU_Motorcycle_Parts_Accessories&hash=item3a5c3fb8ab

[jmw76]

Large,

Those rotors look similar.
The AL top hat looks the same but they are 7mm and 260mm diam.
It also says they are for the rear.
It is likely that the same AL top hat was used in a number of different configurations.

Is anyone aware of a variation that used 5mm x 250mm rotors on the front (there is likely to be a LH and RH version)?

Cheers

[TurboKat]

It's definately a GS/GSX Suzuki disc, identical to some 1000 & 1100 rears I've got here xcept mine are 275 & 7mm. I'd suggest yours are off maybe a 250, 400 or 450. I thought only the rear discs were riveted but yours must be a front pair because I'm pretty sure all the small & midsize Suzys had the rears on the same side.

[TurboKat]

It's definately a GS/GSX Suzuki disc, identical to some 1000 & 1100 rears I've got here xcept mine are 275 & 7mm. I'd suggest yours are off maybe a 250, 400 or 450. I thought only the rear discs were riveted but yours must be a front pair because I'm pretty sure all the small & midsize Suzys had the rears on the same side.

[jmw76]

After having another good look at the disks, it could be that they are in fact rear rotor assemblies with one of the friction surfaces reversed and re-rivited. I suspect also that a little has been machined off the diameter as there is not a lot of material beyond the outer most slots. They probably started life as 260mm disks.

Any other thoughts would be welcomed.

Unfortunately I can not use larger discs as they will not fit within the wheels.