<<I've not seen the XCA mentioned - anybody know anything more about
these tires, or have experience with them?>>

I've never seen them anywhere either - except for one place...
http://www.michelin.com/us/eng/news/agilis/3.htm ...Where it says "The
Michelin [Agilis] 61, 81, 101 and 106 replace the Michelin XC 4S and
the XCA (PR 6, 8 and 10)". And no one argues that the Agilis is a not
"vanagonworthy" tire, so it would follow that the XCA would also be
classified as such. (A personal aside: Hmmm... now what's the "PR"
stand for? Um... could it be... PLY RATING!?!! You know who you are.)

Doug Fitz-Randolph
Yarmouth, ME
'90 Syncro