When I got my trike, I called Hannigan to get some info on the Gen II kit and the 180 front end, specifically tire pressure on the 180. I was told to run 42psi. When I asked about tire longevity, they couldn't answer because the kit hadn't been out that long. I ran 42 psi but the tire rubbed the inside fork leg, so I lowered it to 40 psi which solved the rubbing issue, but, after 21k mikes, the tire started cupping and riding really rough. On my way back from Georgia a couple weeks ago I ordered a new tire so I could get the cupped rough riding tire off.
While I was waiting for the tire to come in I got online and did some searches for the proper tire pressure for this front end set up. I found a blog from a guy who has the same front end, experiencing the same issues except his tire started cupping at 40k miles. He figured he couldn't hurt the tire anymore by experimenting with it so he played with lowering his pressure and ended up at 35 psi. He said his cupping went away and the front end rides a lot less harsh than it had.
So with new tire now in hand, I figured before I change it I would give that a try. I lowered the pressure to 35 psi and low and behold after a couple hundred miles, the cupping is almost gone and the ride is much smoother. There's still a dead spot on the tire from the PO letting it sit in one spot for 2 + years, but the cupping is gone. So I'm going to leave this tire on and see what a lower pressure does for me.
Has anyone else ever tried lowering the PSI to stop cupping? With any success?
I guess my only concern is with the sideways pressure the tire has to take around corners, will it stay on the bead?