They fit fine. Brake line had to go outside of nicely designed oem routing thru forks. But, not many bikes have brake line running internally through head tube and forks anyway- no biggie.
I bought them as new take offs online, steerer tube had been cut and they would not work on st1. In fact, even oem stromer suspension forks or fox or rock shox steerer tubes uncut length(265mm)are barely long enough to fit my st1 step-thru that I only recently figured out that st1 step-thru head tube is much longer than st1 men's frame. Of course, it's why st1 "girls" bike has such a masculine profile compared to mens model. And contributes to " the coolest looking girls bike ever" (imo).
Tapered, uncut, and 15mm axle are the only criteria to fit. Mine are 100 mm travel and any rake and trail issues are a non event on either bike.