Aeroheads may be 20 but the Aeroheat that I am using is advertised as 24 and appears to use the same or at least a similar extrusion to the Dyads. Mine measures 23mm wide at the machined braking surface. I saw my new bike breifly on Sunday but forgot to bring a ruler to measure the curent setup which is LX Cantis. I should be picking up the bike in the next couple of weeks as the snow melts and my bike shed gets cleared out. I'm waiting for new spokes now. I ordered the wrong size and noticed while lacing the wheel last night. Oops
