Originally Posted by
T-Mar
The change is small enough that that it would probably not be noticed by the majority of cyclists. However, for those that can detect it, is is a small enough that the rider should easily adjust to it.
Some of the change that will be felt will be due to the altering of the rider position. The saddle to bar height differential will be larger. The saddle will be slightly farther forward relative to the pedals. Angles of the bars and saddle change very slightly. Re-establishing the baseline position by adjusting these parameters will attenuate any noticeable effect.
I've done enough fork rerakes to know that the drop in handlebars is easily adjusted by raising the stem a few mm. Reraking a fork changes the head tube and seat tube angle relative to the ground as well. I haven't noticed the relationship of the saddle to pedals changing, althought that too can be adjusted out. I'm more sensitive to saddle tilt, having pulled a seatpost and saddle out of one bike to move to another, the difference in seat tube angle dropped the nose slightly, and I noticed that I was sliding forward while riding just a bit. Again, a simple change of the saddle angle fixed that.
For the OP, the 2mm change in trail would be difficult to feel.