Axles and brake disc spacers

[lostinflyz]

Has anyone any experience with brake disc spacers??

how far can one space apart a disc from the wheel before it gets dodge. I could sit down and sort it out but thats way more effort than i fell i can put in.

Addiitonally anyone know a good machine shop in CHCH (or else where if they are cheap and/or brillant) to make up precision spacers and a new axle.

Dont wanna change out my front wheel but trying to drop a r6 front end in the race bike.

[AllanB]

For the machine shop in CHCH call Don at Pit Lane - Don has had a bit of work done with laser cut triple clamps and bits so he'll have a good contact.

[TLDV8]

It depends how far you want to move the rotors.
Most standard locating spigots are around 5mm to 6mm to suit the carrier thickness.
Although it is only locating the rotor on centre,the friction of the carrier to the wheel hub mounting surface is doing a lot of the work.
Most rotor bolts are shouldered also so spigot them to the counterbore in the wheel hub.
I say do not go beyond half of the hub locating spigot so perhaps a 6mm increase in rotor spacing,max.

Here are few i did in the past.
The late GSXR wheel makes things a little more time consuming due to the changed mounting set up.
The mission to put 2006 GSXR 1000 forks in TL1000 triple clamps with a GSXR fitment Carrozzeria wheel.

The rotor spacing needed to be increased to 138mm centres from 132 so custom 3mm stepped spacers were needed.
A new axle spacer was needed also,its size was increased over the puny GSXR item.









The next problem,the stock GSXR rotor fasteners were now to short (imo) with the rotor moved outward 3mm.
Solved by making a small jig so a set of GSXR1100 fasteners could be reduced in length,the longer shoulder
than the GSXR1000 item meant the counterbore in the wheel was once again within spec.



Next up was being able to fit the stock TL1000 wheels and rotors (Same wheel as the 96 to 99 SRAD 750 and Hayabusa to 2007) to the GSXR1000 forks.
The TL wheel has a standard hub set up so a simple ring was all that was needed.
The faced rear surface on the TL rotor has a 1mm difference to the 2001 up GSXR rotor so the rings are 2mm thickness to get the same 138mm centres.



It didn't stop there,next up was fitting Yamaha R1 calipers to the GSXR forks,same 108mm mounting centres and offset was almost spot on.



The option with 2004 up GSXR1000 forks meant tophat counterbore or double tophat if the standard locating rings were removed.
These moved the caliper out to suit the TL1000 320mm rotors (310mm on the late GSXR)







What does all this waffle mean besides trying to give an idea of what you might be up against.
I guess if you are sensible you can mod things to suit as long as you keep it within limits (mechanically)
You wouldn't want to push things being brakes,it comes back to how much you want to move the rotors.
I would have done the job for you but am no longer in NZ.

[lostinflyz]

cheers TLDV8,that was alotta good info.

yea ive calced up the spacings and its looking to be around 8.5mm spacers either side. so thats a big of a bugger. may have to sit down and go through the numbers to see how evil it would be.

other option is to get new triples done but trying to avoid it if i can. but cheers for all the info.

[AllanB]

Triples. I was on a old Kawasaki room for a few years and a lot of guys were putting modern forks on old Kawa's. The easiest way was to use the modern triples and get a new steering shaft machined for the old headset/new triples then pressed in. Mind you a difference in the tube offset from the steering head between old and new will alter handling.

[lostinflyz]

yea trouble is i already have custom triples on the bike and dont really wanna stick a new set in there. but may have to.

might look at making a wheel supported disc spacer to take some of the load off the bolts.

[lostinflyz]

ok scrub that. 8.5mm spacers??

a few reverse calcs then show that on the measured bike the disc must be 3.5mm from the fork leg. That cant be right (esp. when you add the wee mounting bolts for the brake disc friction surface). I hope.

bugger it ill just stick it in and sort out sizes from there.