suntour superbe and superbe pro cranksets (road) have a unique "suntour" taper. I've only ever used these cranksets with suntour bb, so i couldn't tell you if this specific taper is closer to jis or iso. I should measure the differences one of these days. In any case, I've seen them successfully mated to both iso and jis. You just want to avoid swapping back and forth. Oddly enough, my '84 suntour superbe/pro catalog doesn't have any bb info.