I've been building up a fixed gear, and it's in the final tweaking stage. Following the last two rides, I've: rotated the bars very slightly to level (forward maybe 3 degrees), re-taped the handlebars center-outward to eliminate the adhesive strips, added a 2 mm spaces above the stem to enable better headset pre-load, re-tensioned and trued the front rim (new, machine built wheel), moved the rear wheel slightly to increase chain slack just a bit, and attempted to solve the real problem: slipping in the seatpost-to-saddle rail clamp.
This one is a bugger. Here's the as-built original seatpost. Note the miniscule actual clamping area on the rails. While highly adjustable, these tiny wings provide insufficient clamping force, no matter torqued I make the bolts.
Because the bike is all black and intended to be very light, I went with a carbon seatpost.
Here's the temporary fix found at my local co-op. Bead-blasted aluminum is not the look I'm after, but it does (at least) function.
