Ron, I would take them into a Toyo dealer. At least one looks bad enough to replace, and Toyo will replace them in pairs in any case. They may pro-rate the one that is not truly separating, but it would be worth it for new tires.
My experience is that in our size, the week 31-33 tires often split. Rotating them generally keeps them serviceable (i.e. seam, but not gaping split). I haven't seen or heard of any blow outs from this, as the issue does not affect the tire structure (though it can leave it exposed). The worst issue I've seen was on the 4.5 hour enduro on the first set I ran last October. The seam came apart, and a 2x3" chunk of rubber came off, showing the cords underneath. The tire felt like it had a mild flat spot, but was still fast, and lasted the race (I had no idea!). That was before the mounting recommendations, and was mounted backward on the front - worst case scenario. Toyo replaced the whole set at the time.
So far, the week 50+ tires have been better, but it's early.I have 15 heat cycles one one set. I replaced it with a sticker set, the same day as the 15th heat cycle (for comparison), and was no faster on the stickers that is encouraging. The second set seems to be wearing faster, but I did not heat cycle them, and ran a 45" race on them. I will be back on my 15 heat cycle sets this weekend for a test n tune, and will gather tire temp data.
My (evolving) thoughts on these tires:
1. They like a heat cycle. Run them in a warm up, and put them away for a day if you can.
My first set really seemed to like the by the book heat cycle they got, and have been remarkably consistant through 15 (fairly easy) heat cycles. These tires were raced in cool condition, and a several shorter sessions, so that may have helped as well. I'll wear them out this weekend, I suspect. The second set was bolted on, and abused during a long heated race 1st time out, and the second time out. fast, but seem to be wearing faster than set #1, even considering the heavier heat cycles.
2. They don't like small camber I'm not sure if 3.5 or 4 degrees in front is better (yet), but I wouldn't go less than that in front. In the rear, I'd go for max equal camber - 2.5 to -2.75 or so.
3. They may benefit from being flipped on the rim Those who've corded them, did so on the outside edge, almost exclusively
4. I have no idea on pressures yet, hope to after the weekend. It seems that about 40 hot has worked, but the SE30 fast guys are talking about 33 hot. Maybe the 205 on the 7" rim works differently? I'll experiment some this weekend.
5. Rotate them often
Experiences so far seem pretty varied. The only really consistent thing is that they are fun to drive, and fast. We'll have to see how far we can get them to last.
