Hi:
I can't help you w/ your tire size request - sorry!
But, your post brings up a subject - tire preservation on museum aircraft. We've all seen the stands supporting aircraft slightly above the ground to save the tires - avoiding the constant re-airing of them or collapse & cracking, etc.
My question is, what else can be done to preserve old tires in contact with the ground?
I've tried the tire fill with the gel (used on farm equipment, etc.) to replace the air inside entirely. It was on my pit motorcycle
and it worked extremely well. No more flats. It was limited to under 50 mph and made the tire very heavy.
I then tried it on some go kart slicks for a pit cart. After storage for 20 years, the tire rubber was softened - not good.
I don't know if it was the soft racing rubber compound...
The only use I know in the aircraft museum world is the NASM's Ar 234 - their filled the tires with the gel & their only comment was that it made the tires extremely heavy.
For my He 162A-2 project, I have (2) NOS 660x190 MLG tires - that are perfect! You can't believe that they're over 70 years old.
I want to be able to have the airplane displayed on the ground - thus the question of how to do that.
I'm putting springs inside the struts to avoid the leak down issue.
Also, I need inner tubes to protect the tires from whatever solution I come up with.
If this is too far off topic, please reply to me:
fshort@flash.net.
Thanks!
Regards,
James