More riding dynamics and safety with ISA.

With ISA, the length of the top tube can be changed without
losing the sturdiness of the bicycle. In contrast with the adjust-
ment of the seat position over the stem, the rider's centre of
gravity remains balanced between saddle and head tube. This
affects both ergonomics and riding dynamics in a positive way.
With an ISA head tube, the wheel base, and consequently the
riding dynamics, can be adjusted to the cyclist's individual
preferences. Thanks to the variable wheel base, the distance
between the toes and the front wheel increases when the
frame is extended. This means more safety on curves for
cyclists with big feet.

1 shorter wheelbase = agility >   
2   longer wheelbase = stability >