  We propose a dimensionless bendability parameter, $\epsilon^{-1} =
[\left(h/W\right)^2 T^{-1}]^{-1}$ for wrinkling of thin, twisted ribbons with
thickness $h$, width $W$, and tensional strain $T$. Bendability permits
efficient collapse of data for wrinkle onset, wavelength, critical stress, and
residual stress, demonstrating longitudinal wrinkling's primary dependence on
this parameter. This new parameter also allows us to distinguish the highly
bendable range ($\epsilon^{-1} > 20$) from moderately bendable samples
($\epsilon^{-1} \in (0,20]$). We identify scaling relations to describe
longitudinal wrinkles that are valid across our entire set of simulated
ribbons. When restricted to the highly bendable regime, simulations confirm
theoretical near-threshold (NT) predictions for wrinkle onset and wavelength.
