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Spacing out brake discs
Posted: Wed Dec 07, 2011 1:30 pm
Author: martinz1000r
Putting finishing touches to my ELR project and trying to fit front brakes. I have a GPz Untirak front wheel with R1 floating discs and am trying to use AP twin piston calipers that are age authentic for the bike. The issue i have is the R1 discs are not dished so the calipers just snag on the wheel spokes.
Is it possible, and importantly safe, to space out the discs by approx 5 mm to give me the clearance I need?
Posted: Wed Dec 07, 2011 4:35 pm
Author: tlc
I am looking at the options regarding this for my build. It`s easier for me because a more modern bike has options of dish amount from others in the range.
The problem is that the centre hole should be a good fit on the wheel and if you do space it by that much there will be no support. It may be there are discs with a small offset that have the same bolt pattern and centre dimensions.
You could contact EBC and ask if they make or will make a suitable disc.
Or even easier............................fit caliper brackets.
Posted: Wed Dec 07, 2011 5:08 pm
Author: zed1015
5mm will be ok but you will need longer disc bolts.
Ideally with longer shoulders too.
If the spacers were much thicker you would bolt the spacer to the wheel then
bolt the disc to the spacer separately.
Posted: Wed Dec 07, 2011 6:07 pm
Author: Pigford
Always bear in mind - it mainly the FRICTION between the disc rotor & wheel hub that takes the strain - more so than the bolts
So although decent bolts are required, the mating surfaces need to be up to scratch, and dead flat/level or you'll end up with warped or hi/lo points on discs
Posted: Wed Dec 07, 2011 6:20 pm
Author: Koreanbaz
draw it out and where the bolt holes need to be, then get a local machine shop to lazer cut them out off 5mm sheet alloy.
Posted: Mon Dec 12, 2011 3:49 pm
Author: saab9002
I did this, had to move the discs out 8mm on a GPZ1100 wheel, soon found it was a nightmare to get the wheel balanced, so ended up using a more modern wheel.
Chris
Posted: Mon Dec 12, 2011 8:37 pm
Author: chrisNI
EBC wil make discs to any spec with any offset, but it's not a budget option though it is obviously a good job. If you download their online catalogue there should be an order form at the back where you can spec whatever you like. You need to make sure it's all measured right though...
I had discs made by EBC for my Z1000 to enable spacing for six pots with the wire wheel, the offset is about as much as a standard Zed disc. My yokes are wider than standard too though, as the hub and offset discs were wider than the yokes would have been on the 1100 Zephyr the wheel came from as I'm pretty sure that used narrow calipers with pads only on the inside.