Humm…Interesting
I have done this on a Mastiff not a K9 but have done enough of engineering and due diligence on this (enough to earn me a degree – lol) so here’s my 2 cents.
For starters if the wheel is centered and the brake rotor and caliper is aligned – leave it as is and do not make any changes. (As for spacers, each bike is unique to some degree and rather than get measurements, do you own and then get the appropriate spacers ordered or cut – sounds like you may not need it at this point)
Now on to the more important issue you are faced with – mounting the stock fender. THIS CAN BE DONE, here’s how. (Before getting there a BIG shout out to REAPER who shared some pictures and emails with me that led me to this conclusion).
The actual issue you are faced with is matching up the radius of the wheel with the radius of the fender. If you use the stock fender/brackets this will NOT align, however here’s what you can do:
1. Remove the brake caliper stay bracket
2. Mount the fender to the brackets provided by Ted (left side mounts on top of the caliper and the right side is a standalone mount)
3. TRICK – Now mount the caliper stay bracket to the SAME rear bolt that holds the fender. (You might need a spacer here to keep the stay bracket parallel). In doing this you move the geometry and this is how you can accomplish using the stock fender.
I personally DO NOT AGREE with this geometry as I am extremely EXTREMLY particular – that’s just me. Reaper has been riding like that for years and you can ping him for his opinion. Also if this does not make sense or you need any clarification please PM me and I will be glad to talk you through this.
Good luck and PLEASE PROCEED WITH CAUTION.