Originally Posted by configurationspace
If I was to guess I'd say the FastBike internals modify the BMW HP2 "light" version of the "Marzocchi Shivers" to *actual* Marzocchi Shivers.
I think it's right, see post #23 here
seems that the upgrade is not famous, see post # 36, last sentence
Some installs Ohlins TTX material but you must also buy the springs:
Cartridge Kit FGHO 1094 shall be used together with
Íhlins Front Fork Springs part no. 08775-xx.
For rate recommendations, see Owner’s Manual/ General Mounting Instructions.