170 based on what I've read here, not that I've ever gone near that fast. But I still want to know what will happen to my actual top end on the Bonneville Salt Flats if I switch to Leader gears. My guess is a loss of about 20 mph. I think you're saying roughly the same thing.
I completely realized that the Leader gears give more USABLE street power, but I still want to know about the change in the top end.