GSXR 1100 and GSXR 750 front end build for GS 1000

[John Kat]

I decided to "upgrade" my GS 1000 XP to first generation GSXR wheels (http://www.thegsresources.com/_forum/showthread.php?t=170151&page=2).
There was no good reason except that I saw an 1100 Kat with these triple double spoke wheels and I liked the look
For the rear there is no issue interchanging first gen and 2nd gen GSXR wheels ( except the rear disk that measures 220 mm)
I was fortunate enough to find a 18*4 inch wheel that is quite rare over here as they are used by classic racers.
For the front, I bought a GSXR 1100 G ( 1986) front fork.
The model year is important as the spindle measures 15 mm (The later years were upgraded to 17 mm).
After purchasing an 18" front wheel with a 15 mm spindle, I went for some calipers and that's where the issues started
While the calipers ( sold as a GSXR 1100 model...) would mount on the fork, it proved impossible to mount the 310 mm GSXR 1100 disks.
Luckily, I had measured before purchasing the disks
The available space allowed 300 mm disks.
This size was actually fitted to the original GSXR 750 F from 1985!
After some hesitation, I bought a 300 mm disk from MGI Metal gear and hurray it all fits.
Here are some pictures: my set-up first, a GSXR 750 original second and last a GSXR 1100

 

[Guest]

I'm running the same front end on my 80 gs1100. Did you connect the anti dive electrical connections? If so, where? I don't know what to do with mine.

 

[John Kat]

I'm running the same front end on my 80 gs1100. Did you connect the anti dive electrical connections? If so, where? I don't know what to do with mine.

I haven't done it yet but I looked at the circuit diagram and it works as follows:
The antidive goes to the switched +12V through a relay.
The relay is activated by the front stop switch.
To avoid actuating the antidive by the rear brake switch there is a diode in series from the line going from the front switch to the stop light circuit.
Hope it's clear enough?