Hmm. I tried a 109 iso - there's about 3mm space between the inner ring and the chainstay but that's with the crank just seated on the spindle enough for it not to fall off. I think it may be a bit short once I tighten it down. But even at 109, seems jis would put it out too far. It's A Serotta ti frame, btw. Possible the chainstays taper in more than the typical frame? We also may be talking about a different variant of the crank.
.xq