the freewheel is an ENO, its been great! The bash is a Ti one, the alloy one will be too fat to go under the bb. I tried the bike with only two spacers, but it felt too front end heavy when on both wheels, the extra spacers really made it ride much nicer the rear tyre is the best thing on this planet!! itsno lightweight one, its 1200g and has the thickest sidewalls you have ever felt!(makes maxxis dual ply feel like singleply!) I can backhop on slopes like its the flat. The compound is the softest tread I have felt, sooooooo grippy! These a pre productions ones though, the ones for sale will have Kevlar bead to save a few grams but keeping the same sidewall.