Do good autox (and possibly road race) tires still exist in 15" rim sizes appropriate for our cars? Back in the day when I was serious about autox (oh, probably 15years ago...) I used to swear by Hoosier G60-15's (actually tried G60-16's on the same kind of wheel and ran slower).

I've never liked bigger wheels/lower profile tires, and I just ran across a great deal on some wheels with the perfect offset that would make nice autox/road race wheels (15x8 16lbs, 15x10 18lbs) but I don't see the point if I can't find tires for them (have draglite's with slicks and skinnies for the track, and Zo6 wheels for the street, even stock wheels for bad weather/burnouts )

 

I only know of the Hoosier A6 or R6 that is available in a 275/35zr15 which might be a little too wide for the 15x8" but should fit nicely on the 15x10".
It looks like the R6 is also available in a 245/50zr15 that would fit well on the 15x8" rim, but I have never really been a fan of staggered wheels, although it might work for you.
There may be more that I am not aware of and hopefully someone will chime in if there is.