Heres a follow-up on Port-o-walls...
The 12" for trailer worked and look great.
The 15" on Eldorado looked great at first...
I think the 3" width has a shape holding problem.
3 out of 4 went on very good.
I noticed they did not have the same snap as 12" ones did.
The next day I saw some flutter at edges.
Remounted many times, would not hug sidewall of tire.
I knew was just going to get worse.
So had to come up with something else...
Experimented on a regular white wall tire...the 'white' is much wider than what you see.
Ground around and found 2.25" of white...hummmm.
They came out very nice...
Jacked up one side, and mounted them one by one on front. (FWD)
Idled carb way down and set transmission in reverse.
Took one of the polishers and used one of those flapper discs, 40 grit.
While tire was spinng, held disc in on sidewall till I hit white.
Comes very fast, black over white is only about 1/32" deep.
Heres a youtube video of the first minute...takes about 10 mintutes total for each tire.
Lots of rubber dust..wear mask.
YouTube - Wide White Walls
Same skinny white wall after grinding...