aerodynamic and easy to use number plate holder for races, sportive and events places number board directly behind the seat post, out of the Wind and out of the way but clearly visible for officials versatile clamp adjusts to all common round and Aero seat posts, won’t’ Slip in use and won’t scratch your precious components holder sandwiches number board, holding it without the need to drill any holes, important for events that stipulate that boards must be Returned undamaged.
