Gran Turismo in the UK took a look at the Jockey's chain tensioner and decided it needed to be improved. The GT tensioner is similar to the Jockey's in that it can function as either a top-down or a bottom-up tensioner, but the real glory comes in the adjustment. The Jockey's uses the conventional fixed shoe for the tensioner and you adjust the bracket but the GT tensioner, you adjust the shoe while bracket is fixed. This is important as it allows the use of the standard chain tensioner tab washer to ensure the bolts on the shoe do not come loose.
This style of tensioner allows the use of a large range of different chain and sprocket combinations. It is generally recommended that you omit the bottom chain guide when fitting this tensioner.