The -12 uses the same tire & tube on the nose that is used on the mains. Yes still available.
Unfortunately for me and my RV6A - it's nosewheel is not the same as the mains and uses a 11/400-5 tube/tire. I was told on a differnt post earlier today that they never made that Michelin never made that size.
I know this is an old thread - but did you verify that Michelin no loner makes nosewheel tubes? I was looking for my 6A and couldn't find them - then saw your post. Would love to know for vertain eigher way.
I upgraded to the Beringer tubeless and have not had an issue since.
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2010 RV7A
KCHD
RV10 on my wishlist....someday
Still learning more about RVs every single day