will this work on my Bike Friday Tikit - SRAM 3x9 Dual Drive or SA 8 speed IGH. has anyone done any gear upgrades on their Tikit ? the curious side of me is acting up again. but in all honesty since i got a good deal on my TIKIT i am thinking of changing the gearings. my wife told me that this will be my last bike upgrade - unless i hit the lotto. so i might as well make it the best TIKIT out there...