The V2 910 is probably the slowest wheel around, a speed Len Johnson
use to recommend to elite athletes; for all others he suggested the 930
or sometimes the 920. Marwe's 610 skate is probably the most widely
used rollerski by elites and masters in the U.S., except perhaps in the
east where Jenex is located. It's also popular among some European
teams (lots more brand competition though). I'm not sure about how
widely used the classic versions are outside the upper midwest (where
Finn Sisu is located and used to run masters programs). Elites favor
the single body 700, while the 800, which is the Marwe Combi with a
removable wirewheel attachment, is popular among others. I sold my 930s
a couple of years ago, but as I recall the 800C's ride is much better
and its speed is comparable, perhaps a touch faster. Nothing dangerous
in itself - I'm no daredevil - especially with that limiter in the
bearing.
Gene