I know this is an old topic, but after some 4 hrs of searching and rereading 'many' K bike sites about Radial tires for the K75S, all the info seems to be old.
The tires they be a changing.
For the Y spoke rims the consensus 2 or more years ago was the BT023/110/80/18 for the front and the Avon AV46 140/18/17 for the rear because of it's being able to fit that narrower rim. A nice combination apparently.
After some online shopping it seems the BT023 is easy to get, the Avon not so much, although I did find one...it looks like that tire is discontinued.
My question is, has anyone been using more 'updated' ie: not discontinued radials for the rear that work on the Y Spoke and would be nice for spirited riding in the mountains.
Currently have Spitfires on there that came with the bike when I bought it..Unless something else is wrong with the K bike's handling, I don't like them..But then this is my first K bike.
As an aside, I have considered another set of Pirelli Sport Demon bias units, as I quite like them on my old Guzzi 1000 SP...and they are actually available for our K75S sizes..