If you have a different kind of wheel up front, then maybe it works ok.
For example, I once ran a faster 33mm wheel on the front of my Marwe
combis (with wire wheel attachment), and a 40mm in back. I didn't like
the speed on downhills, but it was otherwise workable. But my hunch
is slow and very slow will be different than medium slow and medium,
though I suppose it can be relative to your strength.

Gene

On Mon, 20 May 2013 05:25:55 -0700 (PDT)
Jon wrote:

Gene--thanks for feedback.

I have a small foot, so rear part of binding hits part of the fork
mount "earlier" than rear of boot would hit anything. And on "Pilot
Sport" binding, the rear part is a solid piece of plastic--that's why
I'm wondering about trimming it (but I don't want to crack it while
doing so)

Great point using wheels of different speeds and it reminds me of the
odd feeling I used to get when using V2 speed reducers to add more
resistance (or their old "variable resistance" add-on). Definitely
took away from enjoying the experience, so maybe I should just scrap
that idea....