Front wheel and brake

The front setup consists of the following parts;
GS500E forks and front wheel
GSX-R1000K2 single 6-pot caliper and disc

This caliper came off PP's GSX-R1000K2. It's the
last model with conventionally mounted six-pot calipers (opposed to radially mounted) with lightweight aluminum pistons.
The disc also came off PP's GSX-R1000K2 and FHMoto kindly donated a set of new BRAKING pads.
Mark of Manic Motorcycles offered to fabricate the spacer needed to mate the GSX-R1000 disc to the GS500E wheel.
And even though Mark suffered major injuries during an horriffic accident he still found the dedication to sort me out with the spacer in time.
Backside of the spacer that mounts to the wheel.
This is what it looks like fitted to the wheel
From the beginning my main goal was to be able to retain the upper mounting point so that the caliper stays as close to the fork leg as possible retaining a standard look, maximum strength and perfect alignment.
As this picture shows the thickness of the spacer is spot on with the disc being dead center of the caliper.
The GS500E uses a 310mm disc as standard but with the 320mm GSX-R1000 disk everything falls together perfectly.

Time to call in help from Tinie from BikePenR and his machinepark.

So next on the agenda was to somehow modify the lower lug on the fork leg to create space for an adapter.

The lower lug was shortened and then shaped to somewhat resemble the lower lug.

To ensure perfect alignment of the caliper a flat surface was machined to the lug.
This is the basic functional shape of the adapter block. Looking quite substantial in it's rough form.
But a few hours on the mill removing excessive material and it looks incredibly sleek and standard!
Very pleased with the result!

Next up are a new front axle and wheel spacers.

The standars axle was too short because I'm using Sprintek's Slingshot yokes.

The wheel spacers have the same stepped-design like the rear wheel spacer.

Time to brush up on my AutoCAD skills again.

Give it to Tinie, go on holiday in the UK and this is what you get when you come back.

The axle has recesses for a 19mm wrench.

The other side. The thread of the axle is kept a bit long in case any adjustment is needed and I don't know which nut to use yet as the standard one was shagged.
And this is the result of many hours of hard labour by many different people.

But it really paid off as this totally one-off front end turned out better than I could have imagined.

Thanks to Simon and Rich @ FHMoto, Mark @ Manic Motorcycles, Tinie @ BikePenR, Steve @ Sprintek and Fred @ Postmamotoren (for the brake pump) for their tremendous efforts!

Front end sorted!

The chassis is now allmost completed.

Oh hold on...
- fork brace
- outrigger bearing
- footrests

hmmm... back to work then ;-)


Some notes;
Existing piston aera of GSX-R1000K2 caliper

four 27mm pistons and two 24 mm pistons
0.785 x 27 x 27 x 4 + 0.785 x 24 x 24 x 2 = 3193mm2
Piston diameter on four-pot caliper

SQR ( 3193 / 4 / 0.785 ) = 31.9mmPiston diameter on two-pot caliper
SQR ( 3193 / 2 / 0.785 ) = 45mm
So we're looking for the brake pump of a bike that uses four 32mm pistons or two 45mm pistons