Richmond Park - FAST!!! What a difference aero bars make! Just had the bike serviced and bought a pair of budget aero bars. My previous fastest time for the park loop was 52:44; this was 3:08 quicker at 49:36. Average speed was 1.7kph higher at 31.6kph.
I reckon they add at least 10%, save 10-15sec/km when you're using them. And this is without them in ideal position yet. I'm certainly going to move them forwards about 3-5cm. I'm only sorry I didn't buy them earlier… Still, two more sprint tris to do this spring, so hopefully I'll see the benefit then.