Light(ish)weight Pompetamine

It's just a bit fugly and rules out riding fixed.

There are other options with vertical dropout frames; some kind of eccentric bottom bracket or chain half links / magic ratios etc.

If I were you I'd look out for the single speed specialized Tri-Cross in the second hand market - it's an ali frame with track ends. Frame and fork should be under 2kg. No disc bosses but discs and track ends aren't really best friends so no real loss there.

Many thanks Howard.

Do you mean this:

http://www.specialized.com/gb/gb/bikes/road/tricross/tricrosselitedisccompact

Looks perfect, but no horizontal dropouts, unless I'm missing something.

Thanks again.

Jules