##BBB AeroFix Number Plate Mount For Aero Posts Quickly and easily display your race number with the BBB AeroFix Number Plate Mount For Aero Posts. Designed specifically to fit aero seatposts, the BBB Aero Fix Clamp has rubber O-ring bands for tying around your seatpost rather than cumbersome and potentially damaging cable ties. Self tapping screws allow for quick and easy number attachment on race day when the last thing you want to do is spend ages attaching your number. Rubber protection on the clamp's inside also prevents seatpost damage and the aluminium construction means the clamp weighs less than 15 grams.