Reflexite's V82 is nearly twice as reflective as the V92 "Daybright" stuff (in silver), and still is thin enough to conform to frame tubes without trying to peel itself off, so I recommend V82 and I found a source for it, too: http://www.night-gear.com/reflective.../Reflexite.htm Both the DOT Conspicuity Tape and the V82 listed in colors at the bottom of the page are V82. Naturally, silver reflects most strongly since it reflects all wavelengths.

Not all SOLAS is created equal, by the way. Reflexite's SOLAS is prismatic (micro cube-corner prism reflectors) whereas 3M's is encapsulated-lens (glass beads, not nearly as reflective).