Well, after 2200-2300 miles, I found some wear worth talking about on my Shinko 712 front tire. I found some uneven wear on a certain trailing edge of the tread. I reckon this is the part of the tread that gets the most shearing forces from braking and such. Is this the beginnings of what is called cupping, or is cupping something slightly different? I think I used around 32 psi at first, but lately I have been using more-- 37 psi, according to the latest measurement. The fellow who sold it to me (I don't put much confidence in this fellow, FYI) specifically told me to run it at 40 psi. Strangely, that is also the max cold pressure.

What am I doing wrong? Should I check rear tire alignment? I think I am using the front brake a little more since my front is new and the rear feels a bit glazed (It will still lock though). Could I be riding it hard? Or is it simply time to show wear? How can I make it wear evenly? I don't want lumpy tread on my new front tire.

I may post pictures soon. It's probably a lot harder to see it in the pictures. It's not hard to see in person. You should be able to see the rounded edges, though.

What kind of air did you use?

Sorry had in my mind a question from a customer...
he asked me what spec air do I use when testing my ducts, DIN or SAE?
I said the free kind.

when you see this on a car, you check your balance, bushings, air pressure, etc.

40psi is too high, 29 is recommended.
and are you still using rotella as fork oil?

Yes, I haven't changed the oil in the forks, but I only used around 1/3 motor oil. The rest is ATF. It should be no worse than using 15-20 weight fork oil. I might add, though, that many of my miles were made in cool weather, which would stiffen the forks. On the other hand, it would also harden the tires as well, so...??? The VI of ATF and 5w-40 should be fairly high compared to run-of-the-mill 15 weight fork oil, therefore I wonder if the forks would have been just as stiff, if not stiffer otherwise... unless you're thinking of straight ATF.

I thought that low pressure caused cupping.

From watching it, I have felt that my front tire hasn't been rolling down the road smoothly. It could be that my fork oil mixture is thicker than I estimated, or I have balance issues.

...Or it could be nothing in particular. ???

...Or maybe it is something... Just something else...???

If excessive damping is the problem, then how do all those stiff-suspension fans like WD manage?

And another

Another pic.