I have an IR temp gun, and today was the first time that I made a lot of use of it..... used it once going down to Florida with Andy and we checked our tires but that was it.
Today, I made 3 different inspections...
Air temps between 79 and 84, pushing hard at speeds of 82 to 87 mph.
Occasional speeds of 105 getting around traffic before I got caught behind 17 trucks doubled up side by side.
At the fuel stops, I grabbed the IR temp gun and almost every time, this is what I found.
Bike's front tire, 104ish
Bike's rear tire, 134 +/- a bit
I checked a Harley Classic at the same time parked in front of me. His front and back tires were exactly the same as mine.
Trailer tires 120*F in early morning, 128*F in late afternoon.
Axle hubs were running 104*F consistently all day long.
It is a bunked myth that 8 inch wheels can't be used at high speeds or the bearings will lock up.
I serviced the hubs and packed them with lithium wheel bearing lube. Just the ordinary stuff you get for marine wheel bearings.
Tried to install Bearing buddies but they won't fit my Harbor Freight hubs
( odd thing about those things.... someone at the Edgefield rally told a group of us that Bearing Buddys make a hub run hotter than w/o. something about being packed solid with grease is worse than just enough to cover the bearings )
The only issue I can visualize is overlooking a bad tire. My trailer's tires are about 22 months old as of today. They have according to the previous owner been to the east coast, the west coast and down to Houston, Tx and back.
For me, I just put 4,100 miles on them in 3 weeks, and 104*F hub temps tell me that all is well.
The tires never exceeded 128*F so it is a fallacy that small tires will get too hot... and blow up.
I have 20 psi in them, trailer is guesstimated at about 350-400 lbs loaded. ( I intend to put the tires on a set of bathroom scales this evening.... the only thing I removed from the trailer is my duffle bags.... guessing that maybe 60 lbs total? )