Originally Posted by
Mr.Ploppy
Cool beans, Mr.Beanz!
What is that thing anyway?
Gear indicator. It splices into the cable/hoising. There is a lil red donut that hugs the cable. When you switch gears, it tightens the cable and moves the donut to the next hash mark (increment). Riders can tell how many gears are left to eachside or what cog they are riding.
It's (or it was) standard equipmetn for 9 speed Dura Ace. I thought I saw somewhere that they were sold for use with other levels (Ult/105 etc.) That was sometime back so I'm not sure if they still sell them separately.
Something like this:..now that I think of it, I belive the Shimano Fight Deck system has a gear indicator display on the screen
http://www.universalcycles.com/shopp...e.php?id=16743