In any case, the results are quite surprising..
> Shoe Covers ($30) save 30sec over regular shoes
> Skin suit ($250) saves 134sec over standard bibs/jersey
> Aero helmet ($165) saves 67sec over regular bike helmet
> Aero front wheel (up to $1000) saves 42sec over spoked training wheel
> Aero rear wheel (up to $1500) saves 29sec over spoked training wheel
> Aero bike (up to $12,000) saves 17sec over round tube TT bike