well the only other adapter that i know of is the FD one, but again it is about the same price as Mike's plus the gears. Also FD's is alot heavier because its basically the LST clutchbell but with an epoxied adapter inside. So mikes is alot more light weight, more compact and just works better overall. On ebay there is a spur gear set up that is a +2 i believe and it would help with the top end if thats what your looking for, once in a while people get them for less then $40, and if you lucky you can get one like that too.