Sun Mountain Speed Car SeatDesigned for our Speed Cart Series carts, the Speed Cart Seat inserts easily into the wheel fixture. The spring operated seat pops up when not in use and the thermoformed seat pad folds away for storage. This seat kit includes the mounting bracket. Some assembly is required to add the seat fixture to your cart. To fold the seat, hold the stem with one hand and lift the seat pad with the other hand. Once lifted, tilt to one side.