Its a mono-shock set-up with no visible rear suspension giving a "floating engine" look, its called PISS system ( perfectly invisible suspension system ).
Dwarf crew from TDR Scooters, England made this thing =)

If ya ask me its perfect for stunt stuff...

The movement or travel is almost identical, i.e. where the original shock compresses say 75 mm up and down the new layout dose the same. But this is easy to ajust through the seat with a preload spanner. The engine brace is there for two reasons, somewhere to mount the shock (also so the ride hight can be changed roadside) and it should also aid the strenght of the engine.

waynder ( long time ) its looking great about time you put some pics on italjet dragster i didnt know tdr were involved

Couldn`t even imagine what would happen in a car crash...

But looks nice dough...

im not so sure i like it. it gives the motor a cool look yes, but you got the bar coming though the front. not my style.
that thing is alsogood cuz it prevents ur sooter to bend while doing 12 bar tricks...

we messured mine old SR once... And when i stand on my steering while itson 12 bar it bends around 2-3 inche =)

Roxy whit Gilera 125 or + engine hm...Nice thing