Getting a tire to seat with spoked wheels

Today I had my new 205/65/15 mounted at a local dealer.
The technicians were reluctant to mount my tire but agreed. They
Were unable to get the tire to seat on the rim.
So I left with an unseated bead and unbalanced. It's sitting
Next to my wood stove with 90 lbs in the tire. Can anyone
Give me some advice?

Since you are new here, I'll repeat what I've already posted.

Yes, when I mounted a 15" tire to a Vulcan 900C rim, I had the exact same problem, even trying every slippery substance available and even taking it to a friend at an auto shop that also mounts tires, even using 100 PSI did not force the tire over the safety beads on the the rim.

Measured the inner diameter of different brand car tires and found them all to be 14 15/16", while measuring several brands of bike tires, found them all to be 15 1/16" diameter. All were quite consistent in this measurement.

The only way I could get it to seat, was to use a 5" grinding wheel on a drill and take off about 1/16" of rubber all around the inside flat part of the tire itself. Being very careful to not cut any more than that and making it very smooth.

Worked like a charm, allowed it to seat with about 50 PSI. Made a 1500 miles Interstate trip to NC, rode on the Dragon and all around that area, and have not lost any air pressure in over a year and about 5,000 miles.

Thank you.

Next time I'll search...

I finally got the tire seated on the rim. A thin coating
Of wheel bearing grease, 90 psi and a heat gun. Took
15 minutes.

dml1127 wrote:I finally got the tire seated on the rim. A thin coating
Of wheel bearing grease, 90 psi and a heat gun. Took
15 minutes.

You shouldn't use petroleum products on tires because it degrades the rubber.