GSX-R K4 1000 front end into K3 600
GSX-R K4 1000 front end into K3 600
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DuncsGTi

Original Poster:

1,165 posts

195 months

Tuesday
quotequote all
Evening all. I'm hoping I can confirm a few things using the knowledge base that is BB.

I've got a K3 600 which I'd like to improve the suspension and brakes on. I've sourced a set of forks and triple clamps from a K4 1K and a set of Brembo M4.32 which should work great with the RCS 19 I've already got.

I know this was quite a common conversion in days gone by so hopefully someone on here has done it and can advise.

The K4 1K had 300mm discs whereas the the 600 has 320. From what I've read the M4 calipers require a 5mm spacer on these forks. With the bigger discs that should equate to a 15mm spacer shouldn't it?

Also, the few internet threads I've found suggest the discs sit 2.5mm further outboard from the wheel on the 1K and I'll need a spacer ring between the wheel and disc. Can anyone confirm this?

Cheers