WOW. Some comments I would not expect, and maybe it is because I was not clear to start with. The concentration I need to sharpen is more a cyclist concentration than needing a shrink. I often ride in groups that average over 20 MPH with the riders only inches apart. One second can make the difference between a problem and avoiding one. The solo situation has more to do with tinkering with my Garmin a couple times over the past 10 years. The concentration has more to do with pulling off the road to make a repair or adjustment than, once again, needing a shrink. I consider that trying to make an adjustment on the bike a loss of concentration.