I have posted twice elsewhere in this forum, and neither one is visible after several days, so I’ll try here. Why can’t I post links?
The standard Valkyrie front tyre is a Dunlop D254F 130/60 R19 61H radial, a very odd size for a radial. It's in the Dunlop Australia catalogue, but I don't know if anyone imports it. This tyre is available on Ebay, from the UK, so that is one solution. Rear is 180/55 R17 73H, also a radial. To replace that my choice would be Michelin Pilot Road 4 GT.
Then there is the alternative front tyre size 120/70 R19 60V radial, available in several brands. I'd go for the Michelin Pilot Road 4 Trail. The speed rating is higher than 61H, but the load rating is 7kg lower. A tyre calculator on the web (I’m not allowed to post the link here) shows this to be 1.9% larger in diameter, not enough, I assume, to affect the ABS. Elsewhere I have read that relative tyre profiles do not affect ABS, is this true?
There are cruiser front tyres 130/60 B19 61H in bias, like the Dunlop D208, Dunlop American Elite, Michelin Commander 2, Michelin Scorcher 31 etc. My tyre dealer insists that mixed bias/radial on a bike renders it unroadworthy here in Australia. I could find no rule like that, and I think he's wrong. There appears to be no problem with bias front and radial rear. Many bikes come from the factory like that, and Michelin recommends that combination for some bikes. Another such bias front tyre is the Metzeler ME888.
Finally, my tyre retailer suggested a more cruiser oriented tyre for the back, for longer tyre life. The 180/55 R17 size appears limited to sports or touring tyres, but the Metzeler ME888 180/60 B17 75V is close. The tyre calculator says it does 2.8% fewer revs per mile, so the speedo (sensor is on the final drive) would read 97.2km/h where it would read 100 on the 180/55. That might make it more accurate.
So I'm thinking about the ME888 bias/bias combination. What tyres are people running on the Valk?