I have a Fantom 29er frame that I am considering putting a rigid fork on. Since these frames seem to be comfortable with 100 to 120 mm travel forks, I am worried that a shorter rigid fork would adversely affect handling. The longest rigid fork I have found has a 470 mm axle to crown measurement, I also came across a little device that adds 7mm to the bottom headset race which would in effect add 7 mm to the axle to crown length. I rarely do any real off-roading. Mostly country roads and bike trails.