I, too, am intrigued. Just what does the top cap do after the stem bolts have been tightened? Other than preventing the core sampling of one's brain?hd reynolds said:That is where the argument is. You and ALF say no mechanical purpose after stem is tightened. I say this is wrong assumption. If you dont get this then try removing it and riding your bike like usual as i've suggested. Then YOU and this ALF guy will find out that this is not so.
The top cap is not just a cosmetic device. The Ahead stem set up (from the top cap to the star nut to the stem to the steerer etc.) is the sum of all its parts to work mechanically sound.