I have my ute setup exactly how I want it as far as wheel/tire combination and fender clearance, but I want to upgrade my brakes. Right now I'm using the stock disc setup which uses a very small solid disc and small caliper mounting bolt spacing. I've already made coilovers out of the struts I'm using and don't really want to change struts.

What I plan to do is have new hubs made up that will have the outer face of the hub 8mm inwards to compensate for S13 discs between the hub and wheel. This way the wheels will be in the same spot, Then make up so brackets for the calipers.

What I want to know is if there's something I'm not seeing like problems with extra stress on wheel bearings or something along those lines and I'm open to suggestions.

Here's old pics of the current setup before I cut it up and made coilovers out of the struts:

coilover=height adjustable
what im seeming here is one brand spankingly new/clean orig setup.
Looks to have everything new but no coilover sleeve to adjust height. Plenty of people have adapted s13 brakes to fit the kb110 (disk) struts with no problems.
The disk WILL just slip over the hub of drum brakes but the disk hub DOES need to be machined so it will fit over. I still havnt gotten to it but im thinking it possible to use hub off drum strut on disk strut to fit the rotors. Then its just a case of getting an adapter made up to mount calipers and then fitting lines and bleeding.
I will soon be updating to this and believe it will be adequate

Right, as I said I want the same track, and that would be like adding an 8mm spacer on either side.

And,

Quote:

Thanks for the reply though... but I'm more interested in if my idea has some flaws.

as cheater_5 said, the drum hubs might be the go as they might already be that 8mm further in to compensate for the drum thickness

haha my bad dude. should have read it properly.
What shocks have you used in your coilover setup?

Im not an engineerer or anything but i think you will be fine with a shorter hub to compensate the 8mm. If you for some reason decided to make a longer hub then i would be worried of the stress levels pulling on bearing and stub axle.
Because it will be that little be shorter you would think the forces would be acting in a more "central" (for lack of a better word) manner of the bearing/stub axle rather than creating a large torque around the bearing/axle if it was further out with a longer hub.
Like holding a ruler at the very end and waving it around then holding it further to the middle and waving it around... les wave


Im sure you will be fine. Prob pay to check with an engineer rather than us though as im sure he would be much more help.
Any pics of the coilover setup nowadays?

for reference sake i measured my drum hub (b110).
Came up with these figures:
47mm from base to mounting face
82mm overall length
~155mm mounting face dia

If someone could measure up a disk hub that would be a big help in the unraveling of this mystery.

Piccy




Also i have been told the drum stub axle is thicker which means the bearing will have a larger internal dia. Im thinking if the disk bearing has the same outside dia as drum bearing then you could use the drum hub on disk bearing on disk strut and not have to machine outer dia of hub.
Could be a lot cheaper than a new hub??
Just putting thoughts out there
Hope you dont get annoyed with the info being in this thread. will move if you want.

I'll get out one of my spare disc hubs and measure it.... I had some drum struts/hubs that I tossed out too... gonna kick myself if that would have been the go...

Thanks for the idea/advice.

On another tangent, I measured the thickness of some newer (97 ish) Camaro disc hats and they were only 3 mm! These were like 11" rotors too at least. The S13 discs are 8mm thick in the hat. Got me thinking about thinning them out some and cutting back the surface of the hub a little, like 4mm hat thickness and 3mm off the hub, then just raise the front a tad, but I'm not too sure about the safety.

Oh yeah the inserts I'm running are KYB from Matsuoka. 100mm shortened housings (the late ute disc strut housings are longer than the drum ones).

yea i will be very happy if the hub thing works as im getting myself into the same thing.
By any chance do you have a part number for the shocks ? Just makes getting them a hole lot easier.

So what are you trying to achieve with the drum hub on the disk strut? When I was trying to sort out my front end set up I found that the brackets for the Caliper were going to be Bloody hard to make to suit the disk strut.
Instead why dont you slip the s13 disk over the drum hub and then get 2.5mm machined off the mounting face of the hub. Or half machined of the disk hat and half machined off the hub face. That will leave yu with stock track width.
With that setup you may run into trouble with the caliper contacting on the back of the wheel.
Mine just touched but I just cleaned up the caliper with the grinder and its perfect.