I bought a set YEARS ago for a triple, never could make friends with them. Jade converted them the alky and ran them on his BIG twin and they worked OK. They I think they were 52s. I was hoping for miracles, but they were so fucking big, and 300' is so short, I don't think they were a good fit for that. On a 1000 foot sled race I think you'd realize the advantages on the big end.
That all said, I wish the issue that was constant with Jades bike would have been realized when those were on it. Knowing what I do now, I think they would have worked well on his monster.
And now that I think about it, I have no clue where those ended up. Money well spent I guess.