Measurement from ground to top of the carriage channel 150mm
Measurement from ground to bottom of the carriage channel 90mm
Recommend you place 12mm threaded rod into concrete to support base plate of rollers with nuts top and bottom which will give adjustment to finished gate height. A good measurement for the concrete level the carriage wheel base plate will sit on is 130mm below (bottom of carriage) the finished gate carriage height to clear the highest point in the driveway.
We recommend you fit aluminum gate to save on weight.
To install an aluminum gate to the top of the carriage, weld threaded rod vertical in the centre (spaced every 1m or between your vertical bars of the gate). Drill matching holes in the bottom RHS of your gate (bottom hole larger to fit over your threaded rod weld) and fit dome nuts to secure the gate down onto the carriage. If using aluminium gates, place a thin rubber spacer between the gate and the steel carriage to prevent oxidation.