K75S 3 Spoke Front Wheel Bolt Pattern Specs?

[diesis]

TLDR: Anybody have detailed information on the brake rotor bolt pattern for the 3 spoke front rim for a K75?  I'm building a rotor adapter to a GSXR 1000 fork/caliper front end.

If you're bored:

I continue on my mission to break perfectly working things for no good reason other than "it's fun/I learn something when I do it wrong the first time".  I'm doing a front end swap on my 93 K75C - it's getting a donor 2007 Suzuki GSXR 1000 set of forks and calipers (using a kit from https://www.jaxgarage.com.au/product/bmw-fork-conversion-kit-7s/#content-1).  I have both 4 spoke "snowflake" rims and 3 spoke rims for the bike.  I was able to source kit parts to do the swap for the snowflake rim, but haven't found them for the 3 spoke.  So, figured I'd try and design my own.  I'll go out and caliper out the rim I have, but wanted to see if there were more precise measurements out there I could check against.  Or if someone knows of a rotor adapter out there, all the better.

[The Mighty Gryphon]

I'm not real sure what you are talking about.  I have swapped three spoke for the Y spoke wheels with no issues.  Are the wheels you're working with all K75 wheels?

[diesis]

I'm pretty sure they are:  Y-spoke have 4 bolt holes to mount the brake rotor assembly on the cast rim, and the 3-spoke wheels have a 6 bolt pattern to do the same  https://shop.maxbmw.com/fiche/DiagramsMain.aspx?vid=51745&rnd=10232024.  Are the two wheels functionally interchangeable on a standard K75 front end - Absolutely.  But, when adapting for the Suzuki GSXR fork spacing I have to adjust rotor position to line up with the calipers and thus was anticipating adapting off of the cast rim mount holes.  I hadn't realized the difference between the rims initially and assumed the 3-spokes would work easily (and thus bought / powdered a set of 3-spoke wheels) and the following conversion kit: https://www.jaxgarage.com.au/product/bmw-k100-rotor-adapter-kit-1/#! before reading the fine print (I still haven't learned to RTFM apparently) that it only works on the Y-spoke.  I've got a set of Y-spokes and will run the kit on that, but figured I might as well try and adapt a 3-spoke as a learning experience. 

[Laitch]

I might as well try and adapt a 3-spoke as a learning experience. 

It looks like you're finding the fun in modification you set out to have! 

[Kaos]

The r1100 3 spoke has the 6 mounting points for the brake disk. The k4v series have 4 just like the y spoke.
Thats where the mixup might have happened.
Also check Hedgehoggarage for their conversion sets to gsxr forks. However changing to usd forks might be cheaper to do with R forks nowadays.